drivers/usb/core/devio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      devio.c  --  User space communication with USB devices.
   6  *
   7  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/usb/quirks.h>
  36 #include <linux/cdev.h>
  37 #include <linux/notifier.h>
  38 #include <linux/security.h>
  39 #include <linux/user_namespace.h>
  40 #include <linux/scatterlist.h>
  41 #include <linux/uaccess.h>
  42 #include <linux/dma-mapping.h>
  43 #include <asm/byteorder.h>
  44 #include <linux/moduleparam.h>
  45
  46 #include "usb.h"
  47
  48 #ifdef CONFIG_PM
  49 #define MAYBE_CAP_SUSPEND       USBDEVFS_CAP_SUSPEND
  50 #else
  51 #define MAYBE_CAP_SUSPEND       0
  52 #endif
  53
  54 #define USB_MAXBUS                      64
  55 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  56 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  57
  58 /* Mutual exclusion for ps->list in resume vs. release and remove */
  59 static DEFINE_MUTEX(usbfs_mutex);
  60
  61 struct usb_dev_state {
  62         struct list_head list;      /* state list */
  63         struct usb_device *dev;
  64         struct file *file;
  65         spinlock_t lock;            /* protects the async urb lists */
  66         struct list_head async_pending;
  67         struct list_head async_completed;
  68         struct list_head memory_list;
  69         wait_queue_head_t wait;     /* wake up if a request completed */
  70         wait_queue_head_t wait_for_resume;   /* wake up upon runtime resume */
  71         unsigned int discsignr;
  72         struct pid *disc_pid;
  73         const struct cred *cred;
  74         sigval_t disccontext;
  75         unsigned long ifclaimed;
  76         u32 disabled_bulk_eps;
  77         unsigned long interface_allowed_mask;
  78         int not_yet_resumed;
  79         bool suspend_allowed;
  80         bool privileges_dropped;
  81 };
  82
  83 struct usb_memory {
  84         struct list_head memlist;
  85         int vma_use_count;
  86         int urb_use_count;
  87         u32 size;
  88         void *mem;
  89         dma_addr_t dma_handle;
  90         unsigned long vm_start;
  91         struct usb_dev_state *ps;
  92 };
  93
  94 struct async {
  95         struct list_head asynclist;
  96         struct usb_dev_state *ps;
  97         struct pid *pid;
  98         const struct cred *cred;
  99         unsigned int signr;
 100         unsigned int ifnum;
 101         void __user *userbuffer;
 102         void __user *userurb;
 103         sigval_t userurb_sigval;
 104         struct urb *urb;
 105         struct usb_memory *usbm;
 106         unsigned int mem_usage;
 107         int status;
 108         u8 bulk_addr;
 109         u8 bulk_status;
 110 };
 111
 112 static bool usbfs_snoop;
 113 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 114 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 115
 116 static unsigned usbfs_snoop_max = 65536;
 117 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 118 MODULE_PARM_DESC(usbfs_snoop_max,
 119                 "maximum number of bytes to print while snooping");
 120
 121 #define snoop(dev, format, arg...)                              \
 122         do {                                                    \
 123                 if (usbfs_snoop)                                \
 124                         dev_info(dev, format, ## arg);          \
 125         } while (0)
 126
 127 enum snoop_when {
 128         SUBMIT, COMPLETE
 129 };
 130
 131 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 132
 133 /* Limit on the total amount of memory we can allocate for transfers */
 134 static u32 usbfs_memory_mb = 16;
 135 module_param(usbfs_memory_mb, uint, 0644);
 136 MODULE_PARM_DESC(usbfs_memory_mb,
 137                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 138
 139 /* Hard limit, necessary to avoid arithmetic overflow */
 140 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 141
 142 static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
 143 static u64 usbfs_memory_usage;  /* Total memory currently allocated */
 144
 145 /* Check whether it's okay to allocate more memory for a transfer */
 146 static int usbfs_increase_memory_usage(u64 amount)
 147 {
 148         u64 lim, total_mem;
 149         unsigned long flags;
 150         int ret;
 151
 152         lim = READ_ONCE(usbfs_memory_mb);
 153         lim <<= 20;
 154
 155         ret = 0;
 156         spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
 157         total_mem = usbfs_memory_usage + amount;
 158         if (lim > 0 && total_mem > lim)
 159                 ret = -ENOMEM;
 160         else
 161                 usbfs_memory_usage = total_mem;
 162         spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
 163
 164         return ret;
 165 }
 166
 167 /* Memory for a transfer is being deallocated */
 168 static void usbfs_decrease_memory_usage(u64 amount)
 169 {
 170         unsigned long flags;
 171
 172         spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
 173         if (amount > usbfs_memory_usage)
 174                 usbfs_memory_usage = 0;
 175         else
 176                 usbfs_memory_usage -= amount;
 177         spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
 178 }
 179
 180 static int connected(struct usb_dev_state *ps)
 181 {
 182         return (!list_empty(&ps->list) &&
 183                         ps->dev->state != USB_STATE_NOTATTACHED);
 184 }
 185
 186 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 187 {
 188         struct usb_dev_state *ps = usbm->ps;
 189         unsigned long flags;
 190
 191         spin_lock_irqsave(&ps->lock, flags);
 192         --*count;
 193         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 194                 list_del(&usbm->memlist);
 195                 spin_unlock_irqrestore(&ps->lock, flags);
 196
 197                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 198                                 usbm->dma_handle);
 199                 usbfs_decrease_memory_usage(
 200                         usbm->size + sizeof(struct usb_memory));
 201                 kfree(usbm);
 202         } else {
 203                 spin_unlock_irqrestore(&ps->lock, flags);
 204         }
 205 }
 206
 207 static void usbdev_vm_open(struct vm_area_struct *vma)
 208 {
 209         struct usb_memory *usbm = vma->vm_private_data;
 210         unsigned long flags;
 211
 212         spin_lock_irqsave(&usbm->ps->lock, flags);
 213         ++usbm->vma_use_count;
 214         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 215 }
 216
 217 static void usbdev_vm_close(struct vm_area_struct *vma)
 218 {
 219         struct usb_memory *usbm = vma->vm_private_data;
 220
 221         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 222 }
 223
 224 static const struct vm_operations_struct usbdev_vm_ops = {
 225         .open = usbdev_vm_open,
 226         .close = usbdev_vm_close
 227 };
 228
 229 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 230 {
 231         struct usb_memory *usbm = NULL;
 232         struct usb_dev_state *ps = file->private_data;
 233         struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
 234         size_t size = vma->vm_end - vma->vm_start;
 235         void *mem;
 236         unsigned long flags;
 237         dma_addr_t dma_handle;
 238         int ret;
 239
 240         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 241         if (ret)
 242                 goto error;
 243
 244         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 245         if (!usbm) {
 246                 ret = -ENOMEM;
 247                 goto error_decrease_mem;
 248         }
 249
 250         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 251                         &dma_handle);
 252         if (!mem) {
 253                 ret = -ENOMEM;
 254                 goto error_free_usbm;
 255         }
 256
 257         memset(mem, 0, size);
 258
 259         usbm->mem = mem;
 260         usbm->dma_handle = dma_handle;
 261         usbm->size = size;
 262         usbm->ps = ps;
 263         usbm->vm_start = vma->vm_start;
 264         usbm->vma_use_count = 1;
 265         INIT_LIST_HEAD(&usbm->memlist);
 266
 267         if (hcd->localmem_pool || !hcd_uses_dma(hcd)) {
 268                 if (remap_pfn_range(vma, vma->vm_start,
 269                                     virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 270                                     size, vma->vm_page_prot) < 0) {
 271                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 272                         return -EAGAIN;
 273                 }
 274         } else {
 275                 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
 276                                       size)) {
 277                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 278                         return -EAGAIN;
 279                 }
 280         }
 281
 282         vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
 283         vma->vm_ops = &usbdev_vm_ops;
 284         vma->vm_private_data = usbm;
 285
 286         spin_lock_irqsave(&ps->lock, flags);
 287         list_add_tail(&usbm->memlist, &ps->memory_list);
 288         spin_unlock_irqrestore(&ps->lock, flags);
 289
 290         return 0;
 291
 292 error_free_usbm:
 293         kfree(usbm);
 294 error_decrease_mem:
 295         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 296 error:
 297         return ret;
 298 }
 299
 300 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 301                            loff_t *ppos)
 302 {
 303         struct usb_dev_state *ps = file->private_data;
 304         struct usb_device *dev = ps->dev;
 305         ssize_t ret = 0;
 306         unsigned len;
 307         loff_t pos;
 308         int i;
 309
 310         pos = *ppos;
 311         usb_lock_device(dev);
 312         if (!connected(ps)) {
 313                 ret = -ENODEV;
 314                 goto err;
 315         } else if (pos < 0) {
 316                 ret = -EINVAL;
 317                 goto err;
 318         }
 319
 320         if (pos < sizeof(struct usb_device_descriptor)) {
 321                 /* 18 bytes - fits on the stack */
 322                 struct usb_device_descriptor temp_desc;
 323
 324                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 325                 le16_to_cpus(&temp_desc.bcdUSB);
 326                 le16_to_cpus(&temp_desc.idVendor);
 327                 le16_to_cpus(&temp_desc.idProduct);
 328                 le16_to_cpus(&temp_desc.bcdDevice);
 329
 330                 len = sizeof(struct usb_device_descriptor) - pos;
 331                 if (len > nbytes)
 332                         len = nbytes;
 333                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 334                         ret = -EFAULT;
 335                         goto err;
 336                 }
 337
 338                 *ppos += len;
 339                 buf += len;
 340                 nbytes -= len;
 341                 ret += len;
 342         }
 343
 344         pos = sizeof(struct usb_device_descriptor);
 345         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 346                 struct usb_config_descriptor *config =
 347                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 348                 unsigned int length = le16_to_cpu(config->wTotalLength);
 349
 350                 if (*ppos < pos + length) {
 351
 352                         /* The descriptor may claim to be longer than it
 353                          * really is.  Here is the actual allocated length. */
 354                         unsigned alloclen =
 355                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 356
 357                         len = length - (*ppos - pos);
 358                         if (len > nbytes)
 359                                 len = nbytes;
 360
 361                         /* Simply don't write (skip over) unallocated parts */
 362                         if (alloclen > (*ppos - pos)) {
 363                                 alloclen -= (*ppos - pos);
 364                                 if (copy_to_user(buf,
 365                                     dev->rawdescriptors[i] + (*ppos - pos),
 366                                     min(len, alloclen))) {
 367                                         ret = -EFAULT;
 368                                         goto err;
 369                                 }
 370                         }
 371
 372                         *ppos += len;
 373                         buf += len;
 374                         nbytes -= len;
 375                         ret += len;
 376                 }
 377
 378                 pos += length;
 379         }
 380
 381 err:
 382         usb_unlock_device(dev);
 383         return ret;
 384 }
 385
 386 /*
 387  * async list handling
 388  */
 389
 390 static struct async *alloc_async(unsigned int numisoframes)
 391 {
 392         struct async *as;
 393
 394         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 395         if (!as)
 396                 return NULL;
 397         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 398         if (!as->urb) {
 399                 kfree(as);
 400                 return NULL;
 401         }
 402         return as;
 403 }
 404
 405 static void free_async(struct async *as)
 406 {
 407         int i;
 408
 409         put_pid(as->pid);
 410         if (as->cred)
 411                 put_cred(as->cred);
 412         for (i = 0; i < as->urb->num_sgs; i++) {
 413                 if (sg_page(&as->urb->sg[i]))
 414                         kfree(sg_virt(&as->urb->sg[i]));
 415         }
 416
 417         kfree(as->urb->sg);
 418         if (as->usbm == NULL)
 419                 kfree(as->urb->transfer_buffer);
 420         else
 421                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 422
 423         kfree(as->urb->setup_packet);
 424         usb_free_urb(as->urb);
 425         usbfs_decrease_memory_usage(as->mem_usage);
 426         kfree(as);
 427 }
 428
 429 static void async_newpending(struct async *as)
 430 {
 431         struct usb_dev_state *ps = as->ps;
 432         unsigned long flags;
 433
 434         spin_lock_irqsave(&ps->lock, flags);
 435         list_add_tail(&as->asynclist, &ps->async_pending);
 436         spin_unlock_irqrestore(&ps->lock, flags);
 437 }
 438
 439 static void async_removepending(struct async *as)
 440 {
 441         struct usb_dev_state *ps = as->ps;
 442         unsigned long flags;
 443
 444         spin_lock_irqsave(&ps->lock, flags);
 445         list_del_init(&as->asynclist);
 446         spin_unlock_irqrestore(&ps->lock, flags);
 447 }
 448
 449 static struct async *async_getcompleted(struct usb_dev_state *ps)
 450 {
 451         unsigned long flags;
 452         struct async *as = NULL;
 453
 454         spin_lock_irqsave(&ps->lock, flags);
 455         if (!list_empty(&ps->async_completed)) {
 456                 as = list_entry(ps->async_completed.next, struct async,
 457                                 asynclist);
 458                 list_del_init(&as->asynclist);
 459         }
 460         spin_unlock_irqrestore(&ps->lock, flags);
 461         return as;
 462 }
 463
 464 static struct async *async_getpending(struct usb_dev_state *ps,
 465                                              void __user *userurb)
 466 {
 467         struct async *as;
 468
 469         list_for_each_entry(as, &ps->async_pending, asynclist)
 470                 if (as->userurb == userurb) {
 471                         list_del_init(&as->asynclist);
 472                         return as;
 473                 }
 474
 475         return NULL;
 476 }
 477
 478 static void snoop_urb(struct usb_device *udev,
 479                 void __user *userurb, int pipe, unsigned length,
 480                 int timeout_or_status, enum snoop_when when,
 481                 unsigned char *data, unsigned data_len)
 482 {
 483         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 484         static const char *dirs[] = {"out", "in"};
 485         int ep;
 486         const char *t, *d;
 487
 488         if (!usbfs_snoop)
 489                 return;
 490
 491         ep = usb_pipeendpoint(pipe);
 492         t = types[usb_pipetype(pipe)];
 493         d = dirs[!!usb_pipein(pipe)];
 494
 495         if (userurb) {          /* Async */
 496                 if (when == SUBMIT)
 497                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 498                                         "length %u\n",
 499                                         userurb, ep, t, d, length);
 500                 else
 501                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 502                                         "actual_length %u status %d\n",
 503                                         userurb, ep, t, d, length,
 504                                         timeout_or_status);
 505         } else {
 506                 if (when == SUBMIT)
 507                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 508                                         "timeout %d\n",
 509                                         ep, t, d, length, timeout_or_status);
 510                 else
 511                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 512                                         "status %d\n",
 513                                         ep, t, d, length, timeout_or_status);
 514         }
 515
 516         data_len = min(data_len, usbfs_snoop_max);
 517         if (data && data_len > 0) {
 518                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 519                         data, data_len, 1);
 520         }
 521 }
 522
 523 static void snoop_urb_data(struct urb *urb, unsigned len)
 524 {
 525         int i, size;
 526
 527         len = min(len, usbfs_snoop_max);
 528         if (!usbfs_snoop || len == 0)
 529                 return;
 530
 531         if (urb->num_sgs == 0) {
 532                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 533                         urb->transfer_buffer, len, 1);
 534                 return;
 535         }
 536
 537         for (i = 0; i < urb->num_sgs && len; i++) {
 538                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 539                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 540                         sg_virt(&urb->sg[i]), size, 1);
 541                 len -= size;
 542         }
 543 }
 544
 545 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 546 {
 547         unsigned i, len, size;
 548
 549         if (urb->number_of_packets > 0)         /* Isochronous */
 550                 len = urb->transfer_buffer_length;
 551         else                                    /* Non-Isoc */
 552                 len = urb->actual_length;
 553
 554         if (urb->num_sgs == 0) {
 555                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 556                         return -EFAULT;
 557                 return 0;
 558         }
 559
 560         for (i = 0; i < urb->num_sgs && len; i++) {
 561                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 562                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 563                         return -EFAULT;
 564                 userbuffer += size;
 565                 len -= size;
 566         }
 567
 568         return 0;
 569 }
 570
 571 #define AS_CONTINUATION 1
 572 #define AS_UNLINK       2
 573
 574 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 575 __releases(ps->lock)
 576 __acquires(ps->lock)
 577 {
 578         struct urb *urb;
 579         struct async *as;
 580
 581         /* Mark all the pending URBs that match bulk_addr, up to but not
 582          * including the first one without AS_CONTINUATION.  If such an
 583          * URB is encountered then a new transfer has already started so
 584          * the endpoint doesn't need to be disabled; otherwise it does.
 585          */
 586         list_for_each_entry(as, &ps->async_pending, asynclist) {
 587                 if (as->bulk_addr == bulk_addr) {
 588                         if (as->bulk_status != AS_CONTINUATION)
 589                                 goto rescan;
 590                         as->bulk_status = AS_UNLINK;
 591                         as->bulk_addr = 0;
 592                 }
 593         }
 594         ps->disabled_bulk_eps |= (1 << bulk_addr);
 595
 596         /* Now carefully unlink all the marked pending URBs */
 597  rescan:
 598         list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
 599                 if (as->bulk_status == AS_UNLINK) {
 600                         as->bulk_status = 0;            /* Only once */
 601                         urb = as->urb;
 602                         usb_get_urb(urb);
 603                         spin_unlock(&ps->lock);         /* Allow completions */
 604                         usb_unlink_urb(urb);
 605                         usb_put_urb(urb);
 606                         spin_lock(&ps->lock);
 607                         goto rescan;
 608                 }
 609         }
 610 }
 611
 612 static void async_completed(struct urb *urb)
 613 {
 614         struct async *as = urb->context;
 615         struct usb_dev_state *ps = as->ps;
 616         struct pid *pid = NULL;
 617         const struct cred *cred = NULL;
 618         unsigned long flags;
 619         sigval_t addr;
 620         int signr, errno;
 621
 622         spin_lock_irqsave(&ps->lock, flags);
 623         list_move_tail(&as->asynclist, &ps->async_completed);
 624         as->status = urb->status;
 625         signr = as->signr;
 626         if (signr) {
 627                 errno = as->status;
 628                 addr = as->userurb_sigval;
 629                 pid = get_pid(as->pid);
 630                 cred = get_cred(as->cred);
 631         }
 632         snoop(&urb->dev->dev, "urb complete\n");
 633         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 634                         as->status, COMPLETE, NULL, 0);
 635         if (usb_urb_dir_in(urb))
 636                 snoop_urb_data(urb, urb->actual_length);
 637
 638         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 639                         as->status != -ENOENT)
 640                 cancel_bulk_urbs(ps, as->bulk_addr);
 641
 642         wake_up(&ps->wait);
 643         spin_unlock_irqrestore(&ps->lock, flags);
 644
 645         if (signr) {
 646                 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
 647                 put_pid(pid);
 648                 put_cred(cred);
 649         }
 650 }
 651
 652 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 653 {
 654         struct urb *urb;
 655         struct async *as;
 656         unsigned long flags;
 657
 658         spin_lock_irqsave(&ps->lock, flags);
 659         while (!list_empty(list)) {
 660                 as = list_last_entry(list, struct async, asynclist);
 661                 list_del_init(&as->asynclist);
 662                 urb = as->urb;
 663                 usb_get_urb(urb);
 664
 665                 /* drop the spinlock so the completion handler can run */
 666                 spin_unlock_irqrestore(&ps->lock, flags);
 667                 usb_kill_urb(urb);
 668                 usb_put_urb(urb);
 669                 spin_lock_irqsave(&ps->lock, flags);
 670         }
 671         spin_unlock_irqrestore(&ps->lock, flags);
 672 }
 673
 674 static void destroy_async_on_interface(struct usb_dev_state *ps,
 675                                        unsigned int ifnum)
 676 {
 677         struct list_head *p, *q, hitlist;
 678         unsigned long flags;
 679
 680         INIT_LIST_HEAD(&hitlist);
 681         spin_lock_irqsave(&ps->lock, flags);
 682         list_for_each_safe(p, q, &ps->async_pending)
 683                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 684                         list_move_tail(p, &hitlist);
 685         spin_unlock_irqrestore(&ps->lock, flags);
 686         destroy_async(ps, &hitlist);
 687 }
 688
 689 static void destroy_all_async(struct usb_dev_state *ps)
 690 {
 691         destroy_async(ps, &ps->async_pending);
 692 }
 693
 694 /*
 695  * interface claims are made only at the request of user level code,
 696  * which can also release them (explicitly or by closing files).
 697  * they're also undone when devices disconnect.
 698  */
 699
 700 static int driver_probe(struct usb_interface *intf,
 701                         const struct usb_device_id *id)
 702 {
 703         return -ENODEV;
 704 }
 705
 706 static void driver_disconnect(struct usb_interface *intf)
 707 {
 708         struct usb_dev_state *ps = usb_get_intfdata(intf);
 709         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 710
 711         if (!ps)
 712                 return;
 713
 714         /* NOTE:  this relies on usbcore having canceled and completed
 715          * all pending I/O requests; 2.6 does that.
 716          */
 717
 718         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 719                 clear_bit(ifnum, &ps->ifclaimed);
 720         else
 721                 dev_warn(&intf->dev, "interface number %u out of range\n",
 722                          ifnum);
 723
 724         usb_set_intfdata(intf, NULL);
 725
 726         /* force async requests to complete */
 727         destroy_async_on_interface(ps, ifnum);
 728 }
 729
 730 /* We don't care about suspend/resume of claimed interfaces */
 731 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 732 {
 733         return 0;
 734 }
 735
 736 static int driver_resume(struct usb_interface *intf)
 737 {
 738         return 0;
 739 }
 740
 741 /* The following routines apply to the entire device, not interfaces */
 742 void usbfs_notify_suspend(struct usb_device *udev)
 743 {
 744         /* We don't need to handle this */
 745 }
 746
 747 void usbfs_notify_resume(struct usb_device *udev)
 748 {
 749         struct usb_dev_state *ps;
 750
 751         /* Protect against simultaneous remove or release */
 752         mutex_lock(&usbfs_mutex);
 753         list_for_each_entry(ps, &udev->filelist, list) {
 754                 WRITE_ONCE(ps->not_yet_resumed, 0);
 755                 wake_up_all(&ps->wait_for_resume);
 756         }
 757         mutex_unlock(&usbfs_mutex);
 758 }
 759
 760 struct usb_driver usbfs_driver = {
 761         .name =         "usbfs",
 762         .probe =        driver_probe,
 763         .disconnect =   driver_disconnect,
 764         .suspend =      driver_suspend,
 765         .resume =       driver_resume,
 766         .supports_autosuspend = 1,
 767 };
 768
 769 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 770 {
 771         struct usb_device *dev = ps->dev;
 772         struct usb_interface *intf;
 773         int err;
 774
 775         if (ifnum >= 8*sizeof(ps->ifclaimed))
 776                 return -EINVAL;
 777         /* already claimed */
 778         if (test_bit(ifnum, &ps->ifclaimed))
 779                 return 0;
 780
 781         if (ps->privileges_dropped &&
 782                         !test_bit(ifnum, &ps->interface_allowed_mask))
 783                 return -EACCES;
 784
 785         intf = usb_ifnum_to_if(dev, ifnum);
 786         if (!intf)
 787                 err = -ENOENT;
 788         else {
 789                 unsigned int old_suppress;
 790
 791                 /* suppress uevents while claiming interface */
 792                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 793                 dev_set_uevent_suppress(&intf->dev, 1);
 794                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 795                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 796         }
 797         if (err == 0)
 798                 set_bit(ifnum, &ps->ifclaimed);
 799         return err;
 800 }
 801
 802 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 803 {
 804         struct usb_device *dev;
 805         struct usb_interface *intf;
 806         int err;
 807
 808         err = -EINVAL;
 809         if (ifnum >= 8*sizeof(ps->ifclaimed))
 810                 return err;
 811         dev = ps->dev;
 812         intf = usb_ifnum_to_if(dev, ifnum);
 813         if (!intf)
 814                 err = -ENOENT;
 815         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 816                 unsigned int old_suppress;
 817
 818                 /* suppress uevents while releasing interface */
 819                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 820                 dev_set_uevent_suppress(&intf->dev, 1);
 821                 usb_driver_release_interface(&usbfs_driver, intf);
 822                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 823                 err = 0;
 824         }
 825         return err;
 826 }
 827
 828 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 829 {
 830         if (ps->dev->state != USB_STATE_CONFIGURED)
 831                 return -EHOSTUNREACH;
 832         if (ifnum >= 8*sizeof(ps->ifclaimed))
 833                 return -EINVAL;
 834         if (test_bit(ifnum, &ps->ifclaimed))
 835                 return 0;
 836         /* if not yet claimed, claim it for the driver */
 837         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 838                  "interface %u before use\n", task_pid_nr(current),
 839                  current->comm, ifnum);
 840         return claimintf(ps, ifnum);
 841 }
 842
 843 static int findintfep(struct usb_device *dev, unsigned int ep)
 844 {
 845         unsigned int i, j, e;
 846         struct usb_interface *intf;
 847         struct usb_host_interface *alts;
 848         struct usb_endpoint_descriptor *endpt;
 849
 850         if (ep & ~(USB_DIR_IN|0xf))
 851                 return -EINVAL;
 852         if (!dev->actconfig)
 853                 return -ESRCH;
 854         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 855                 intf = dev->actconfig->interface[i];
 856                 for (j = 0; j < intf->num_altsetting; j++) {
 857                         alts = &intf->altsetting[j];
 858                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 859                                 endpt = &alts->endpoint[e].desc;
 860                                 if (endpt->bEndpointAddress == ep)
 861                                         return alts->desc.bInterfaceNumber;
 862                         }
 863                 }
 864         }
 865         return -ENOENT;
 866 }
 867
 868 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 869                            unsigned int request, unsigned int index)
 870 {
 871         int ret = 0;
 872         struct usb_host_interface *alt_setting;
 873
 874         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 875          && ps->dev->state != USB_STATE_ADDRESS
 876          && ps->dev->state != USB_STATE_CONFIGURED)
 877                 return -EHOSTUNREACH;
 878         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 879                 return 0;
 880
 881         /*
 882          * check for the special corner case 'get_device_id' in the printer
 883          * class specification, which we always want to allow as it is used
 884          * to query things like ink level, etc.
 885          */
 886         if (requesttype == 0xa1 && request == 0) {
 887                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 888                                                    index >> 8, index & 0xff);
 889                 if (alt_setting
 890                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 891                         return 0;
 892         }
 893
 894         index &= 0xff;
 895         switch (requesttype & USB_RECIP_MASK) {
 896         case USB_RECIP_ENDPOINT:
 897                 if ((index & ~USB_DIR_IN) == 0)
 898                         return 0;
 899                 ret = findintfep(ps->dev, index);
 900                 if (ret < 0) {
 901                         /*
 902                          * Some not fully compliant Win apps seem to get
 903                          * index wrong and have the endpoint number here
 904                          * rather than the endpoint address (with the
 905                          * correct direction). Win does let this through,
 906                          * so we'll not reject it here but leave it to
 907                          * the device to not break KVM. But we warn.
 908                          */
 909                         ret = findintfep(ps->dev, index ^ 0x80);
 910                         if (ret >= 0)
 911                                 dev_info(&ps->dev->dev,
 912                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 913                                         __func__, task_pid_nr(current),
 914                                         current->comm, index, index ^ 0x80);
 915                 }
 916                 if (ret >= 0)
 917                         ret = checkintf(ps, ret);
 918                 break;
 919
 920         case USB_RECIP_INTERFACE:
 921                 ret = checkintf(ps, index);
 922                 break;
 923         }
 924         return ret;
 925 }
 926
 927 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 928                                                      unsigned char ep)
 929 {
 930         if (ep & USB_ENDPOINT_DIR_MASK)
 931                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 932         else
 933                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 934 }
 935
 936 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 937                                   struct usbdevfs_streams __user *streams,
 938                                   unsigned int *num_streams_ret,
 939                                   unsigned int *num_eps_ret,
 940                                   struct usb_host_endpoint ***eps_ret,
 941                                   struct usb_interface **intf_ret)
 942 {
 943         unsigned int i, num_streams, num_eps;
 944         struct usb_host_endpoint **eps;
 945         struct usb_interface *intf = NULL;
 946         unsigned char ep;
 947         int ifnum, ret;
 948
 949         if (get_user(num_streams, &streams->num_streams) ||
 950             get_user(num_eps, &streams->num_eps))
 951                 return -EFAULT;
 952
 953         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 954                 return -EINVAL;
 955
 956         /* The XHCI controller allows max 2 ^ 16 streams */
 957         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 958                 return -EINVAL;
 959
 960         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 961         if (!eps)
 962                 return -ENOMEM;
 963
 964         for (i = 0; i < num_eps; i++) {
 965                 if (get_user(ep, &streams->eps[i])) {
 966                         ret = -EFAULT;
 967                         goto error;
 968                 }
 969                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 970                 if (!eps[i]) {
 971                         ret = -EINVAL;
 972                         goto error;
 973                 }
 974
 975                 /* usb_alloc/free_streams operate on an usb_interface */
 976                 ifnum = findintfep(ps->dev, ep);
 977                 if (ifnum < 0) {
 978                         ret = ifnum;
 979                         goto error;
 980                 }
 981
 982                 if (i == 0) {
 983                         ret = checkintf(ps, ifnum);
 984                         if (ret < 0)
 985                                 goto error;
 986                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 987                 } else {
 988                         /* Verify all eps belong to the same interface */
 989                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 990                                 ret = -EINVAL;
 991                                 goto error;
 992                         }
 993                 }
 994         }
 995
 996         if (num_streams_ret)
 997                 *num_streams_ret = num_streams;
 998         *num_eps_ret = num_eps;
 999         *eps_ret = eps;
1000         *intf_ret = intf;
1001
1002         return 0;
1003
1004 error:
1005         kfree(eps);
1006         return ret;
1007 }
1008
1009 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1010 {
1011         struct device *dev;
1012
1013         dev = bus_find_device_by_devt(&usb_bus_type, devt);
1014         if (!dev)
1015                 return NULL;
1016         return to_usb_device(dev);
1017 }
1018
1019 /*
1020  * file operations
1021  */
1022 static int usbdev_open(struct inode *inode, struct file *file)
1023 {
1024         struct usb_device *dev = NULL;
1025         struct usb_dev_state *ps;
1026         int ret;
1027
1028         ret = -ENOMEM;
1029         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1030         if (!ps)
1031                 goto out_free_ps;
1032
1033         ret = -ENODEV;
1034
1035         /* usbdev device-node */
1036         if (imajor(inode) == USB_DEVICE_MAJOR)
1037                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1038         if (!dev)
1039                 goto out_free_ps;
1040
1041         usb_lock_device(dev);
1042         if (dev->state == USB_STATE_NOTATTACHED)
1043                 goto out_unlock_device;
1044
1045         ret = usb_autoresume_device(dev);
1046         if (ret)
1047                 goto out_unlock_device;
1048
1049         ps->dev = dev;
1050         ps->file = file;
1051         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1052         spin_lock_init(&ps->lock);
1053         INIT_LIST_HEAD(&ps->list);
1054         INIT_LIST_HEAD(&ps->async_pending);
1055         INIT_LIST_HEAD(&ps->async_completed);
1056         INIT_LIST_HEAD(&ps->memory_list);
1057         init_waitqueue_head(&ps->wait);
1058         init_waitqueue_head(&ps->wait_for_resume);
1059         ps->disc_pid = get_pid(task_pid(current));
1060         ps->cred = get_current_cred();
1061         smp_wmb();
1062
1063         /* Can't race with resume; the device is already active */
1064         list_add_tail(&ps->list, &dev->filelist);
1065         file->private_data = ps;
1066         usb_unlock_device(dev);
1067         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1068                         current->comm);
1069         return ret;
1070
1071  out_unlock_device:
1072         usb_unlock_device(dev);
1073         usb_put_dev(dev);
1074  out_free_ps:
1075         kfree(ps);
1076         return ret;
1077 }
1078
1079 static int usbdev_release(struct inode *inode, struct file *file)
1080 {
1081         struct usb_dev_state *ps = file->private_data;
1082         struct usb_device *dev = ps->dev;
1083         unsigned int ifnum;
1084         struct async *as;
1085
1086         usb_lock_device(dev);
1087         usb_hub_release_all_ports(dev, ps);
1088
1089         /* Protect against simultaneous resume */
1090         mutex_lock(&usbfs_mutex);
1091         list_del_init(&ps->list);
1092         mutex_unlock(&usbfs_mutex);
1093
1094         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1095                         ifnum++) {
1096                 if (test_bit(ifnum, &ps->ifclaimed))
1097                         releaseintf(ps, ifnum);
1098         }
1099         destroy_all_async(ps);
1100         if (!ps->suspend_allowed)
1101                 usb_autosuspend_device(dev);
1102         usb_unlock_device(dev);
1103         usb_put_dev(dev);
1104         put_pid(ps->disc_pid);
1105         put_cred(ps->cred);
1106
1107         as = async_getcompleted(ps);
1108         while (as) {
1109                 free_async(as);
1110                 as = async_getcompleted(ps);
1111         }
1112
1113         kfree(ps);
1114         return 0;
1115 }
1116
1117 static void usbfs_blocking_completion(struct urb *urb)
1118 {
1119         complete((struct completion *) urb->context);
1120 }
1121
1122 /*
1123  * Much like usb_start_wait_urb, but returns status separately from
1124  * actual_length and uses a killable wait.
1125  */
1126 static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1127                 unsigned int *actlen)
1128 {
1129         DECLARE_COMPLETION_ONSTACK(ctx);
1130         unsigned long expire;
1131         int rc;
1132
1133         urb->context = &ctx;
1134         urb->complete = usbfs_blocking_completion;
1135         *actlen = 0;
1136         rc = usb_submit_urb(urb, GFP_KERNEL);
1137         if (unlikely(rc))
1138                 return rc;
1139
1140         expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1141         rc = wait_for_completion_killable_timeout(&ctx, expire);
1142         if (rc <= 0) {
1143                 usb_kill_urb(urb);
1144                 *actlen = urb->actual_length;
1145                 if (urb->status != -ENOENT)
1146                         ;       /* Completed before it was killed */
1147                 else if (rc < 0)
1148                         return -EINTR;
1149                 else
1150                         return -ETIMEDOUT;
1151         }
1152         *actlen = urb->actual_length;
1153         return urb->status;
1154 }
1155
1156 static int do_proc_control(struct usb_dev_state *ps,
1157                 struct usbdevfs_ctrltransfer *ctrl)
1158 {
1159         struct usb_device *dev = ps->dev;
1160         unsigned int tmo;
1161         unsigned char *tbuf;
1162         unsigned int wLength, actlen;
1163         int i, pipe, ret;
1164         struct urb *urb = NULL;
1165         struct usb_ctrlrequest *dr = NULL;
1166
1167         ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1168                               ctrl->wIndex);
1169         if (ret)
1170                 return ret;
1171         wLength = ctrl->wLength;        /* To suppress 64k PAGE_SIZE warning */
1172         if (wLength > PAGE_SIZE)
1173                 return -EINVAL;
1174         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1175                         sizeof(struct usb_ctrlrequest));
1176         if (ret)
1177                 return ret;
1178
1179         ret = -ENOMEM;
1180         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1181         if (!tbuf)
1182                 goto done;
1183         urb = usb_alloc_urb(0, GFP_NOIO);
1184         if (!urb)
1185                 goto done;
1186         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
1187         if (!dr)
1188                 goto done;
1189
1190         dr->bRequestType = ctrl->bRequestType;
1191         dr->bRequest = ctrl->bRequest;
1192         dr->wValue = cpu_to_le16(ctrl->wValue);
1193         dr->wIndex = cpu_to_le16(ctrl->wIndex);
1194         dr->wLength = cpu_to_le16(ctrl->wLength);
1195
1196         tmo = ctrl->timeout;
1197         snoop(&dev->dev, "control urb: bRequestType=%02x "
1198                 "bRequest=%02x wValue=%04x "
1199                 "wIndex=%04x wLength=%04x\n",
1200                 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1201                 ctrl->wIndex, ctrl->wLength);
1202
1203         if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1204                 pipe = usb_rcvctrlpipe(dev, 0);
1205                 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1206                                 wLength, NULL, NULL);
1207                 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1208
1209                 usb_unlock_device(dev);
1210                 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1211
1212                 /* Linger a bit, prior to the next control message. */
1213                 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1214                         msleep(200);
1215                 usb_lock_device(dev);
1216                 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1217                 if (!i && actlen) {
1218                         if (copy_to_user(ctrl->data, tbuf, actlen)) {
1219                                 ret = -EFAULT;
1220                                 goto done;
1221                         }
1222                 }
1223         } else {
1224                 if (wLength) {
1225                         if (copy_from_user(tbuf, ctrl->data, wLength)) {
1226                                 ret = -EFAULT;
1227                                 goto done;
1228                         }
1229                 }
1230                 pipe = usb_sndctrlpipe(dev, 0);
1231                 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1232                                 wLength, NULL, NULL);
1233                 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1234
1235                 usb_unlock_device(dev);
1236                 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1237
1238                 /* Linger a bit, prior to the next control message. */
1239                 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1240                         msleep(200);
1241                 usb_lock_device(dev);
1242                 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1243         }
1244         if (i < 0 && i != -EPIPE) {
1245                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1246                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1247                            current->comm, ctrl->bRequestType, ctrl->bRequest,
1248                            ctrl->wLength, i);
1249         }
1250         ret = (i < 0 ? i : actlen);
1251
1252  done:
1253         kfree(dr);
1254         usb_free_urb(urb);
1255         free_page((unsigned long) tbuf);
1256         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1257                         sizeof(struct usb_ctrlrequest));
1258         return ret;
1259 }
1260
1261 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1262 {
1263         struct usbdevfs_ctrltransfer ctrl;
1264
1265         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1266                 return -EFAULT;
1267         return do_proc_control(ps, &ctrl);
1268 }
1269
1270 static int do_proc_bulk(struct usb_dev_state *ps,
1271                 struct usbdevfs_bulktransfer *bulk)
1272 {
1273         struct usb_device *dev = ps->dev;
1274         unsigned int tmo, len1, len2, pipe;
1275         unsigned char *tbuf;
1276         int i, ret;
1277         struct urb *urb = NULL;
1278         struct usb_host_endpoint *ep;
1279
1280         ret = findintfep(ps->dev, bulk->ep);
1281         if (ret < 0)
1282                 return ret;
1283         ret = checkintf(ps, ret);
1284         if (ret)
1285                 return ret;
1286
1287         len1 = bulk->len;
1288         if (len1 < 0 || len1 >= (INT_MAX - sizeof(struct urb)))
1289                 return -EINVAL;
1290
1291         if (bulk->ep & USB_DIR_IN)
1292                 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1293         else
1294                 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1295         ep = usb_pipe_endpoint(dev, pipe);
1296         if (!ep || !usb_endpoint_maxp(&ep->desc))
1297                 return -EINVAL;
1298         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1299         if (ret)
1300                 return ret;
1301
1302         /*
1303          * len1 can be almost arbitrarily large.  Don't WARN if it's
1304          * too big, just fail the request.
1305          */
1306         ret = -ENOMEM;
1307         tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1308         if (!tbuf)
1309                 goto done;
1310         urb = usb_alloc_urb(0, GFP_KERNEL);
1311         if (!urb)
1312                 goto done;
1313
1314         if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1315                         USB_ENDPOINT_XFER_INT) {
1316                 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1317                 usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1318                                 NULL, NULL, ep->desc.bInterval);
1319         } else {
1320                 usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1321         }
1322
1323         tmo = bulk->timeout;
1324         if (bulk->ep & 0x80) {
1325                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1326
1327                 usb_unlock_device(dev);
1328                 i = usbfs_start_wait_urb(urb, tmo, &len2);
1329                 usb_lock_device(dev);
1330                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1331
1332                 if (!i && len2) {
1333                         if (copy_to_user(bulk->data, tbuf, len2)) {
1334                                 ret = -EFAULT;
1335                                 goto done;
1336                         }
1337                 }
1338         } else {
1339                 if (len1) {
1340                         if (copy_from_user(tbuf, bulk->data, len1)) {
1341                                 ret = -EFAULT;
1342                                 goto done;
1343                         }
1344                 }
1345                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1346
1347                 usb_unlock_device(dev);
1348                 i = usbfs_start_wait_urb(urb, tmo, &len2);
1349                 usb_lock_device(dev);
1350                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1351         }
1352         ret = (i < 0 ? i : len2);
1353  done:
1354         usb_free_urb(urb);
1355         kfree(tbuf);
1356         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1357         return ret;
1358 }
1359
1360 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1361 {
1362         struct usbdevfs_bulktransfer bulk;
1363
1364         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1365                 return -EFAULT;
1366         return do_proc_bulk(ps, &bulk);
1367 }
1368
1369 static void check_reset_of_active_ep(struct usb_device *udev,
1370                 unsigned int epnum, char *ioctl_name)
1371 {
1372         struct usb_host_endpoint **eps;
1373         struct usb_host_endpoint *ep;
1374
1375         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1376         ep = eps[epnum & 0x0f];
1377         if (ep && !list_empty(&ep->urb_list))
1378                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1379                                 task_pid_nr(current), current->comm,
1380                                 ioctl_name, epnum);
1381 }
1382
1383 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1384 {
1385         unsigned int ep;
1386         int ret;
1387
1388         if (get_user(ep, (unsigned int __user *)arg))
1389                 return -EFAULT;
1390         ret = findintfep(ps->dev, ep);
1391         if (ret < 0)
1392                 return ret;
1393         ret = checkintf(ps, ret);
1394         if (ret)
1395                 return ret;
1396         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1397         usb_reset_endpoint(ps->dev, ep);
1398         return 0;
1399 }
1400
1401 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1402 {
1403         unsigned int ep;
1404         int pipe;
1405         int ret;
1406
1407         if (get_user(ep, (unsigned int __user *)arg))
1408                 return -EFAULT;
1409         ret = findintfep(ps->dev, ep);
1410         if (ret < 0)
1411                 return ret;
1412         ret = checkintf(ps, ret);
1413         if (ret)
1414                 return ret;
1415         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1416         if (ep & USB_DIR_IN)
1417                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1418         else
1419                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1420
1421         return usb_clear_halt(ps->dev, pipe);
1422 }
1423
1424 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1425 {
1426         struct usbdevfs_getdriver gd;
1427         struct usb_interface *intf;
1428         int ret;
1429
1430         if (copy_from_user(&gd, arg, sizeof(gd)))
1431                 return -EFAULT;
1432         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1433         if (!intf || !intf->dev.driver)
1434                 ret = -ENODATA;
1435         else {
1436                 strscpy(gd.driver, intf->dev.driver->name,
1437                                 sizeof(gd.driver));
1438                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1439         }
1440         return ret;
1441 }
1442
1443 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1444 {
1445         struct usbdevfs_connectinfo ci;
1446
1447         memset(&ci, 0, sizeof(ci));
1448         ci.devnum = ps->dev->devnum;
1449         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1450
1451         if (copy_to_user(arg, &ci, sizeof(ci)))
1452                 return -EFAULT;
1453         return 0;
1454 }
1455
1456 static int proc_conninfo_ex(struct usb_dev_state *ps,
1457                             void __user *arg, size_t size)
1458 {
1459         struct usbdevfs_conninfo_ex ci;
1460         struct usb_device *udev = ps->dev;
1461
1462         if (size < sizeof(ci.size))
1463                 return -EINVAL;
1464
1465         memset(&ci, 0, sizeof(ci));
1466         ci.size = sizeof(ci);
1467         ci.busnum = udev->bus->busnum;
1468         ci.devnum = udev->devnum;
1469         ci.speed = udev->speed;
1470
1471         while (udev && udev->portnum != 0) {
1472                 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1473                         ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1474                                         udev->portnum;
1475                 udev = udev->parent;
1476         }
1477
1478         if (ci.num_ports < ARRAY_SIZE(ci.ports))
1479                 memmove(&ci.ports[0],
1480                         &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1481                         ci.num_ports);
1482
1483         if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1484                 return -EFAULT;
1485
1486         return 0;
1487 }
1488
1489 static int proc_resetdevice(struct usb_dev_state *ps)
1490 {
1491         struct usb_host_config *actconfig = ps->dev->actconfig;
1492         struct usb_interface *interface;
1493         int i, number;
1494
1495         /* Don't allow a device reset if the process has dropped the
1496          * privilege to do such things and any of the interfaces are
1497          * currently claimed.
1498          */
1499         if (ps->privileges_dropped && actconfig) {
1500                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1501                         interface = actconfig->interface[i];
1502                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1503                         if (usb_interface_claimed(interface) &&
1504                                         !test_bit(number, &ps->ifclaimed)) {
1505                                 dev_warn(&ps->dev->dev,
1506                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1507                                         number, interface->dev.driver->name, current->comm);
1508                                 return -EACCES;
1509                         }
1510                 }
1511         }
1512
1513         return usb_reset_device(ps->dev);
1514 }
1515
1516 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1517 {
1518         struct usbdevfs_setinterface setintf;
1519         int ret;
1520
1521         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1522                 return -EFAULT;
1523         ret = checkintf(ps, setintf.interface);
1524         if (ret)
1525                 return ret;
1526
1527         destroy_async_on_interface(ps, setintf.interface);
1528
1529         return usb_set_interface(ps->dev, setintf.interface,
1530                         setintf.altsetting);
1531 }
1532
1533 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1534 {
1535         int u;
1536         int status = 0;
1537         struct usb_host_config *actconfig;
1538
1539         if (get_user(u, (int __user *)arg))
1540                 return -EFAULT;
1541
1542         actconfig = ps->dev->actconfig;
1543
1544         /* Don't touch the device if any interfaces are claimed.
1545          * It could interfere with other drivers' operations, and if
1546          * an interface is claimed by usbfs it could easily deadlock.
1547          */
1548         if (actconfig) {
1549                 int i;
1550
1551                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1552                         if (usb_interface_claimed(actconfig->interface[i])) {
1553                                 dev_warn(&ps->dev->dev,
1554                                         "usbfs: interface %d claimed by %s "
1555                                         "while '%s' sets config #%d\n",
1556                                         actconfig->interface[i]
1557                                                 ->cur_altsetting
1558                                                 ->desc.bInterfaceNumber,
1559                                         actconfig->interface[i]
1560                                                 ->dev.driver->name,
1561                                         current->comm, u);
1562                                 status = -EBUSY;
1563                                 break;
1564                         }
1565                 }
1566         }
1567
1568         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1569          * so avoid usb_set_configuration()'s kick to sysfs
1570          */
1571         if (status == 0) {
1572                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1573                         status = usb_reset_configuration(ps->dev);
1574                 else
1575                         status = usb_set_configuration(ps->dev, u);
1576         }
1577
1578         return status;
1579 }
1580
1581 static struct usb_memory *
1582 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1583 {
1584         struct usb_memory *usbm = NULL, *iter;
1585         unsigned long flags;
1586         unsigned long uurb_start = (unsigned long)uurb->buffer;
1587
1588         spin_lock_irqsave(&ps->lock, flags);
1589         list_for_each_entry(iter, &ps->memory_list, memlist) {
1590                 if (uurb_start >= iter->vm_start &&
1591                                 uurb_start < iter->vm_start + iter->size) {
1592                         if (uurb->buffer_length > iter->vm_start + iter->size -
1593                                         uurb_start) {
1594                                 usbm = ERR_PTR(-EINVAL);
1595                         } else {
1596                                 usbm = iter;
1597                                 usbm->urb_use_count++;
1598                         }
1599                         break;
1600                 }
1601         }
1602         spin_unlock_irqrestore(&ps->lock, flags);
1603         return usbm;
1604 }
1605
1606 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1607                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1608                         void __user *arg, sigval_t userurb_sigval)
1609 {
1610         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1611         struct usb_host_endpoint *ep;
1612         struct async *as = NULL;
1613         struct usb_ctrlrequest *dr = NULL;
1614         unsigned int u, totlen, isofrmlen;
1615         int i, ret, num_sgs = 0, ifnum = -1;
1616         int number_of_packets = 0;
1617         unsigned int stream_id = 0;
1618         void *buf;
1619         bool is_in;
1620         bool allow_short = false;
1621         bool allow_zero = false;
1622         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1623                                 USBDEVFS_URB_BULK_CONTINUATION |
1624                                 USBDEVFS_URB_NO_FSBR |
1625                                 USBDEVFS_URB_ZERO_PACKET |
1626                                 USBDEVFS_URB_NO_INTERRUPT;
1627         /* USBDEVFS_URB_ISO_ASAP is a special case */
1628         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1629                 mask |= USBDEVFS_URB_ISO_ASAP;
1630
1631         if (uurb->flags & ~mask)
1632                         return -EINVAL;
1633
1634         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1635                 return -EINVAL;
1636         if (uurb->buffer_length > 0 && !uurb->buffer)
1637                 return -EINVAL;
1638         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1639             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1640                 ifnum = findintfep(ps->dev, uurb->endpoint);
1641                 if (ifnum < 0)
1642                         return ifnum;
1643                 ret = checkintf(ps, ifnum);
1644                 if (ret)
1645                         return ret;
1646         }
1647         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1648         if (!ep)
1649                 return -ENOENT;
1650         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1651
1652         u = 0;
1653         switch (uurb->type) {
1654         case USBDEVFS_URB_TYPE_CONTROL:
1655                 if (!usb_endpoint_xfer_control(&ep->desc))
1656                         return -EINVAL;
1657                 /* min 8 byte setup packet */
1658                 if (uurb->buffer_length < 8)
1659                         return -EINVAL;
1660                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1661                 if (!dr)
1662                         return -ENOMEM;
1663                 if (copy_from_user(dr, uurb->buffer, 8)) {
1664                         ret = -EFAULT;
1665                         goto error;
1666                 }
1667                 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1668                         ret = -EINVAL;
1669                         goto error;
1670                 }
1671                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1672                                       le16_to_cpu(dr->wIndex));
1673                 if (ret)
1674                         goto error;
1675                 uurb->buffer_length = le16_to_cpu(dr->wLength);
1676                 uurb->buffer += 8;
1677                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1678                         is_in = true;
1679                         uurb->endpoint |= USB_DIR_IN;
1680                 } else {
1681                         is_in = false;
1682                         uurb->endpoint &= ~USB_DIR_IN;
1683                 }
1684                 if (is_in)
1685                         allow_short = true;
1686                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1687                         "bRequest=%02x wValue=%04x "
1688                         "wIndex=%04x wLength=%04x\n",
1689                         dr->bRequestType, dr->bRequest,
1690                         __le16_to_cpu(dr->wValue),
1691                         __le16_to_cpu(dr->wIndex),
1692                         __le16_to_cpu(dr->wLength));
1693                 u = sizeof(struct usb_ctrlrequest);
1694                 break;
1695
1696         case USBDEVFS_URB_TYPE_BULK:
1697                 if (!is_in)
1698                         allow_zero = true;
1699                 else
1700                         allow_short = true;
1701                 switch (usb_endpoint_type(&ep->desc)) {
1702                 case USB_ENDPOINT_XFER_CONTROL:
1703                 case USB_ENDPOINT_XFER_ISOC:
1704                         return -EINVAL;
1705                 case USB_ENDPOINT_XFER_INT:
1706                         /* allow single-shot interrupt transfers */
1707                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1708                         goto interrupt_urb;
1709                 }
1710                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1711                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1712                         num_sgs = 0;
1713                 if (ep->streams)
1714                         stream_id = uurb->stream_id;
1715                 break;
1716
1717         case USBDEVFS_URB_TYPE_INTERRUPT:
1718                 if (!usb_endpoint_xfer_int(&ep->desc))
1719                         return -EINVAL;
1720  interrupt_urb:
1721                 if (!is_in)
1722                         allow_zero = true;
1723                 else
1724                         allow_short = true;
1725                 break;
1726
1727         case USBDEVFS_URB_TYPE_ISO:
1728                 /* arbitrary limit */
1729                 if (uurb->number_of_packets < 1 ||
1730                     uurb->number_of_packets > 128)
1731                         return -EINVAL;
1732                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1733                         return -EINVAL;
1734                 number_of_packets = uurb->number_of_packets;
1735                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1736                                    number_of_packets;
1737                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1738                 if (IS_ERR(isopkt)) {
1739                         ret = PTR_ERR(isopkt);
1740                         isopkt = NULL;
1741                         goto error;
1742                 }
1743                 for (totlen = u = 0; u < number_of_packets; u++) {
1744                         /*
1745                          * arbitrary limit need for USB 3.1 Gen2
1746                          * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1747                          */
1748                         if (isopkt[u].length > 98304) {
1749                                 ret = -EINVAL;
1750                                 goto error;
1751                         }
1752                         totlen += isopkt[u].length;
1753                 }
1754                 u *= sizeof(struct usb_iso_packet_descriptor);
1755                 uurb->buffer_length = totlen;
1756                 break;
1757
1758         default:
1759                 return -EINVAL;
1760         }
1761
1762         if (uurb->buffer_length > 0 &&
1763                         !access_ok(uurb->buffer, uurb->buffer_length)) {
1764                 ret = -EFAULT;
1765                 goto error;
1766         }
1767         as = alloc_async(number_of_packets);
1768         if (!as) {
1769                 ret = -ENOMEM;
1770                 goto error;
1771         }
1772
1773         as->usbm = find_memory_area(ps, uurb);
1774         if (IS_ERR(as->usbm)) {
1775                 ret = PTR_ERR(as->usbm);
1776                 as->usbm = NULL;
1777                 goto error;
1778         }
1779
1780         /* do not use SG buffers when memory mapped segments
1781          * are in use
1782          */
1783         if (as->usbm)
1784                 num_sgs = 0;
1785
1786         u += sizeof(struct async) + sizeof(struct urb) +
1787              (as->usbm ? 0 : uurb->buffer_length) +
1788              num_sgs * sizeof(struct scatterlist);
1789         ret = usbfs_increase_memory_usage(u);
1790         if (ret)
1791                 goto error;
1792         as->mem_usage = u;
1793
1794         if (num_sgs) {
1795                 as->urb->sg = kmalloc_array(num_sgs,
1796                                             sizeof(struct scatterlist),
1797                                             GFP_KERNEL | __GFP_NOWARN);
1798                 if (!as->urb->sg) {
1799                         ret = -ENOMEM;
1800                         goto error;
1801                 }
1802                 as->urb->num_sgs = num_sgs;
1803                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1804
1805                 totlen = uurb->buffer_length;
1806                 for (i = 0; i < as->urb->num_sgs; i++) {
1807                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1808                         buf = kmalloc(u, GFP_KERNEL);
1809                         if (!buf) {
1810                                 ret = -ENOMEM;
1811                                 goto error;
1812                         }
1813                         sg_set_buf(&as->urb->sg[i], buf, u);
1814
1815                         if (!is_in) {
1816                                 if (copy_from_user(buf, uurb->buffer, u)) {
1817                                         ret = -EFAULT;
1818                                         goto error;
1819                                 }
1820                                 uurb->buffer += u;
1821                         }
1822                         totlen -= u;
1823                 }
1824         } else if (uurb->buffer_length > 0) {
1825                 if (as->usbm) {
1826                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1827
1828                         as->urb->transfer_buffer = as->usbm->mem +
1829                                         (uurb_start - as->usbm->vm_start);
1830                 } else {
1831                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1832                                         GFP_KERNEL | __GFP_NOWARN);
1833                         if (!as->urb->transfer_buffer) {
1834                                 ret = -ENOMEM;
1835                                 goto error;
1836                         }
1837                         if (!is_in) {
1838                                 if (copy_from_user(as->urb->transfer_buffer,
1839                                                    uurb->buffer,
1840                                                    uurb->buffer_length)) {
1841                                         ret = -EFAULT;
1842                                         goto error;
1843                                 }
1844                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1845                                 /*
1846                                  * Isochronous input data may end up being
1847                                  * discontiguous if some of the packets are
1848                                  * short. Clear the buffer so that the gaps
1849                                  * don't leak kernel data to userspace.
1850                                  */
1851                                 memset(as->urb->transfer_buffer, 0,
1852                                                 uurb->buffer_length);
1853                         }
1854                 }
1855         }
1856         as->urb->dev = ps->dev;
1857         as->urb->pipe = (uurb->type << 30) |
1858                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1859                         (uurb->endpoint & USB_DIR_IN);
1860
1861         /* This tedious sequence is necessary because the URB_* flags
1862          * are internal to the kernel and subject to change, whereas
1863          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1864          */
1865         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1866         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1867                 u |= URB_ISO_ASAP;
1868         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1869                 u |= URB_SHORT_NOT_OK;
1870         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1871                 u |= URB_ZERO_PACKET;
1872         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1873                 u |= URB_NO_INTERRUPT;
1874         as->urb->transfer_flags = u;
1875
1876         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1877                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1878         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1879                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1880
1881         as->urb->transfer_buffer_length = uurb->buffer_length;
1882         as->urb->setup_packet = (unsigned char *)dr;
1883         dr = NULL;
1884         as->urb->start_frame = uurb->start_frame;
1885         as->urb->number_of_packets = number_of_packets;
1886         as->urb->stream_id = stream_id;
1887
1888         if (ep->desc.bInterval) {
1889                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1890                                 ps->dev->speed == USB_SPEED_HIGH ||
1891                                 ps->dev->speed >= USB_SPEED_SUPER)
1892                         as->urb->interval = 1 <<
1893                                         min(15, ep->desc.bInterval - 1);
1894                 else
1895                         as->urb->interval = ep->desc.bInterval;
1896         }
1897
1898         as->urb->context = as;
1899         as->urb->complete = async_completed;
1900         for (totlen = u = 0; u < number_of_packets; u++) {
1901                 as->urb->iso_frame_desc[u].offset = totlen;
1902                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1903                 totlen += isopkt[u].length;
1904         }
1905         kfree(isopkt);
1906         isopkt = NULL;
1907         as->ps = ps;
1908         as->userurb = arg;
1909         as->userurb_sigval = userurb_sigval;
1910         if (as->usbm) {
1911                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1912
1913                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1914                 as->urb->transfer_dma = as->usbm->dma_handle +
1915                                 (uurb_start - as->usbm->vm_start);
1916         } else if (is_in && uurb->buffer_length > 0)
1917                 as->userbuffer = uurb->buffer;
1918         as->signr = uurb->signr;
1919         as->ifnum = ifnum;
1920         as->pid = get_pid(task_pid(current));
1921         as->cred = get_current_cred();
1922         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1923                         as->urb->transfer_buffer_length, 0, SUBMIT,
1924                         NULL, 0);
1925         if (!is_in)
1926                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1927
1928         async_newpending(as);
1929
1930         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1931                 spin_lock_irq(&ps->lock);
1932
1933                 /* Not exactly the endpoint address; the direction bit is
1934                  * shifted to the 0x10 position so that the value will be
1935                  * between 0 and 31.
1936                  */
1937                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1938                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1939                                 >> 3);
1940
1941                 /* If this bulk URB is the start of a new transfer, re-enable
1942                  * the endpoint.  Otherwise mark it as a continuation URB.
1943                  */
1944                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1945                         as->bulk_status = AS_CONTINUATION;
1946                 else
1947                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1948
1949                 /* Don't accept continuation URBs if the endpoint is
1950                  * disabled because of an earlier error.
1951                  */
1952                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1953                         ret = -EREMOTEIO;
1954                 else
1955                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1956                 spin_unlock_irq(&ps->lock);
1957         } else {
1958                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1959         }
1960
1961         if (ret) {
1962                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1963                            "usbfs: usb_submit_urb returned %d\n", ret);
1964                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1965                                 0, ret, COMPLETE, NULL, 0);
1966                 async_removepending(as);
1967                 goto error;
1968         }
1969         return 0;
1970
1971  error:
1972         kfree(isopkt);
1973         kfree(dr);
1974         if (as)
1975                 free_async(as);
1976         return ret;
1977 }
1978
1979 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1980 {
1981         struct usbdevfs_urb uurb;
1982         sigval_t userurb_sigval;
1983
1984         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1985                 return -EFAULT;
1986
1987         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1988         userurb_sigval.sival_ptr = arg;
1989
1990         return proc_do_submiturb(ps, &uurb,
1991                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1992                         arg, userurb_sigval);
1993 }
1994
1995 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1996 {
1997         struct urb *urb;
1998         struct async *as;
1999         unsigned long flags;
2000
2001         spin_lock_irqsave(&ps->lock, flags);
2002         as = async_getpending(ps, arg);
2003         if (!as) {
2004                 spin_unlock_irqrestore(&ps->lock, flags);
2005                 return -EINVAL;
2006         }
2007
2008         urb = as->urb;
2009         usb_get_urb(urb);
2010         spin_unlock_irqrestore(&ps->lock, flags);
2011
2012         usb_kill_urb(urb);
2013         usb_put_urb(urb);
2014
2015         return 0;
2016 }
2017
2018 static void compute_isochronous_actual_length(struct urb *urb)
2019 {
2020         unsigned int i;
2021
2022         if (urb->number_of_packets > 0) {
2023                 urb->actual_length = 0;
2024                 for (i = 0; i < urb->number_of_packets; i++)
2025                         urb->actual_length +=
2026                                         urb->iso_frame_desc[i].actual_length;
2027         }
2028 }
2029
2030 static int processcompl(struct async *as, void __user * __user *arg)
2031 {
2032         struct urb *urb = as->urb;
2033         struct usbdevfs_urb __user *userurb = as->userurb;
2034         void __user *addr = as->userurb;
2035         unsigned int i;
2036
2037         compute_isochronous_actual_length(urb);
2038         if (as->userbuffer && urb->actual_length) {
2039                 if (copy_urb_data_to_user(as->userbuffer, urb))
2040                         goto err_out;
2041         }
2042         if (put_user(as->status, &userurb->status))
2043                 goto err_out;
2044         if (put_user(urb->actual_length, &userurb->actual_length))
2045                 goto err_out;
2046         if (put_user(urb->error_count, &userurb->error_count))
2047                 goto err_out;
2048
2049         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2050                 for (i = 0; i < urb->number_of_packets; i++) {
2051                         if (put_user(urb->iso_frame_desc[i].actual_length,
2052                                      &userurb->iso_frame_desc[i].actual_length))
2053                                 goto err_out;
2054                         if (put_user(urb->iso_frame_desc[i].status,
2055                                      &userurb->iso_frame_desc[i].status))
2056                                 goto err_out;
2057                 }
2058         }
2059
2060         if (put_user(addr, (void __user * __user *)arg))
2061                 return -EFAULT;
2062         return 0;
2063
2064 err_out:
2065         return -EFAULT;
2066 }
2067
2068 static struct async *reap_as(struct usb_dev_state *ps)
2069 {
2070         DECLARE_WAITQUEUE(wait, current);
2071         struct async *as = NULL;
2072         struct usb_device *dev = ps->dev;
2073
2074         add_wait_queue(&ps->wait, &wait);
2075         for (;;) {
2076                 __set_current_state(TASK_INTERRUPTIBLE);
2077                 as = async_getcompleted(ps);
2078                 if (as || !connected(ps))
2079                         break;
2080                 if (signal_pending(current))
2081                         break;
2082                 usb_unlock_device(dev);
2083                 schedule();
2084                 usb_lock_device(dev);
2085         }
2086         remove_wait_queue(&ps->wait, &wait);
2087         set_current_state(TASK_RUNNING);
2088         return as;
2089 }
2090
2091 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2092 {
2093         struct async *as = reap_as(ps);
2094
2095         if (as) {
2096                 int retval;
2097
2098                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2099                 retval = processcompl(as, (void __user * __user *)arg);
2100                 free_async(as);
2101                 return retval;
2102         }
2103         if (signal_pending(current))
2104                 return -EINTR;
2105         return -ENODEV;
2106 }
2107
2108 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2109 {
2110         int retval;
2111         struct async *as;
2112
2113         as = async_getcompleted(ps);
2114         if (as) {
2115                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2116                 retval = processcompl(as, (void __user * __user *)arg);
2117                 free_async(as);
2118         } else {
2119                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2120         }
2121         return retval;
2122 }
2123
2124 #ifdef CONFIG_COMPAT
2125 static int proc_control_compat(struct usb_dev_state *ps,
2126                                 struct usbdevfs_ctrltransfer32 __user *p32)
2127 {
2128         struct usbdevfs_ctrltransfer ctrl;
2129         u32 udata;
2130
2131         if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2132             get_user(udata, &p32->data))
2133                 return -EFAULT;
2134         ctrl.data = compat_ptr(udata);
2135         return do_proc_control(ps, &ctrl);
2136 }
2137
2138 static int proc_bulk_compat(struct usb_dev_state *ps,
2139                         struct usbdevfs_bulktransfer32 __user *p32)
2140 {
2141         struct usbdevfs_bulktransfer bulk;
2142         compat_caddr_t addr;
2143
2144         if (get_user(bulk.ep, &p32->ep) ||
2145             get_user(bulk.len, &p32->len) ||
2146             get_user(bulk.timeout, &p32->timeout) ||
2147             get_user(addr, &p32->data))
2148                 return -EFAULT;
2149         bulk.data = compat_ptr(addr);
2150         return do_proc_bulk(ps, &bulk);
2151 }
2152
2153 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2154 {
2155         struct usbdevfs_disconnectsignal32 ds;
2156
2157         if (copy_from_user(&ds, arg, sizeof(ds)))
2158                 return -EFAULT;
2159         ps->discsignr = ds.signr;
2160         ps->disccontext.sival_int = ds.context;
2161         return 0;
2162 }
2163
2164 static int get_urb32(struct usbdevfs_urb *kurb,
2165                      struct usbdevfs_urb32 __user *uurb)
2166 {
2167         struct usbdevfs_urb32 urb32;
2168         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2169                 return -EFAULT;
2170         kurb->type = urb32.type;
2171         kurb->endpoint = urb32.endpoint;
2172         kurb->status = urb32.status;
2173         kurb->flags = urb32.flags;
2174         kurb->buffer = compat_ptr(urb32.buffer);
2175         kurb->buffer_length = urb32.buffer_length;
2176         kurb->actual_length = urb32.actual_length;
2177         kurb->start_frame = urb32.start_frame;
2178         kurb->number_of_packets = urb32.number_of_packets;
2179         kurb->error_count = urb32.error_count;
2180         kurb->signr = urb32.signr;
2181         kurb->usercontext = compat_ptr(urb32.usercontext);
2182         return 0;
2183 }
2184
2185 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2186 {
2187         struct usbdevfs_urb uurb;
2188         sigval_t userurb_sigval;
2189
2190         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2191                 return -EFAULT;
2192
2193         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2194         userurb_sigval.sival_int = ptr_to_compat(arg);
2195
2196         return proc_do_submiturb(ps, &uurb,
2197                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2198                         arg, userurb_sigval);
2199 }
2200
2201 static int processcompl_compat(struct async *as, void __user * __user *arg)
2202 {
2203         struct urb *urb = as->urb;
2204         struct usbdevfs_urb32 __user *userurb = as->userurb;
2205         void __user *addr = as->userurb;
2206         unsigned int i;
2207
2208         compute_isochronous_actual_length(urb);
2209         if (as->userbuffer && urb->actual_length) {
2210                 if (copy_urb_data_to_user(as->userbuffer, urb))
2211                         return -EFAULT;
2212         }
2213         if (put_user(as->status, &userurb->status))
2214                 return -EFAULT;
2215         if (put_user(urb->actual_length, &userurb->actual_length))
2216                 return -EFAULT;
2217         if (put_user(urb->error_count, &userurb->error_count))
2218                 return -EFAULT;
2219
2220         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2221                 for (i = 0; i < urb->number_of_packets; i++) {
2222                         if (put_user(urb->iso_frame_desc[i].actual_length,
2223                                      &userurb->iso_frame_desc[i].actual_length))
2224                                 return -EFAULT;
2225                         if (put_user(urb->iso_frame_desc[i].status,
2226                                      &userurb->iso_frame_desc[i].status))
2227                                 return -EFAULT;
2228                 }
2229         }
2230
2231         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2232                 return -EFAULT;
2233         return 0;
2234 }
2235
2236 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2237 {
2238         struct async *as = reap_as(ps);
2239
2240         if (as) {
2241                 int retval;
2242
2243                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2244                 retval = processcompl_compat(as, (void __user * __user *)arg);
2245                 free_async(as);
2246                 return retval;
2247         }
2248         if (signal_pending(current))
2249                 return -EINTR;
2250         return -ENODEV;
2251 }
2252
2253 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2254 {
2255         int retval;
2256         struct async *as;
2257
2258         as = async_getcompleted(ps);
2259         if (as) {
2260                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2261                 retval = processcompl_compat(as, (void __user * __user *)arg);
2262                 free_async(as);
2263         } else {
2264                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2265         }
2266         return retval;
2267 }
2268
2269
2270 #endif
2271
2272 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2273 {
2274         struct usbdevfs_disconnectsignal ds;
2275
2276         if (copy_from_user(&ds, arg, sizeof(ds)))
2277                 return -EFAULT;
2278         ps->discsignr = ds.signr;
2279         ps->disccontext.sival_ptr = ds.context;
2280         return 0;
2281 }
2282
2283 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2284 {
2285         unsigned int ifnum;
2286
2287         if (get_user(ifnum, (unsigned int __user *)arg))
2288                 return -EFAULT;
2289         return claimintf(ps, ifnum);
2290 }
2291
2292 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2293 {
2294         unsigned int ifnum;
2295         int ret;
2296
2297         if (get_user(ifnum, (unsigned int __user *)arg))
2298                 return -EFAULT;
2299         ret = releaseintf(ps, ifnum);
2300         if (ret < 0)
2301                 return ret;
2302         destroy_async_on_interface(ps, ifnum);
2303         return 0;
2304 }
2305
2306 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2307 {
2308         int                     size;
2309         void                    *buf = NULL;
2310         int                     retval = 0;
2311         struct usb_interface    *intf = NULL;
2312         struct usb_driver       *driver = NULL;
2313
2314         if (ps->privileges_dropped)
2315                 return -EACCES;
2316
2317         if (!connected(ps))
2318                 return -ENODEV;
2319
2320         /* alloc buffer */
2321         size = _IOC_SIZE(ctl->ioctl_code);
2322         if (size > 0) {
2323                 buf = kmalloc(size, GFP_KERNEL);
2324                 if (buf == NULL)
2325                         return -ENOMEM;
2326                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2327                         if (copy_from_user(buf, ctl->data, size)) {
2328                                 kfree(buf);
2329                                 return -EFAULT;
2330                         }
2331                 } else {
2332                         memset(buf, 0, size);
2333                 }
2334         }
2335
2336         if (ps->dev->state != USB_STATE_CONFIGURED)
2337                 retval = -EHOSTUNREACH;
2338         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2339                 retval = -EINVAL;
2340         else switch (ctl->ioctl_code) {
2341
2342         /* disconnect kernel driver from interface */
2343         case USBDEVFS_DISCONNECT:
2344                 if (intf->dev.driver) {
2345                         driver = to_usb_driver(intf->dev.driver);
2346                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2347                         usb_driver_release_interface(driver, intf);
2348                 } else
2349                         retval = -ENODATA;
2350                 break;
2351
2352         /* let kernel drivers try to (re)bind to the interface */
2353         case USBDEVFS_CONNECT:
2354                 if (!intf->dev.driver)
2355                         retval = device_attach(&intf->dev);
2356                 else
2357                         retval = -EBUSY;
2358                 break;
2359
2360         /* talk directly to the interface's driver */
2361         default:
2362                 if (intf->dev.driver)
2363                         driver = to_usb_driver(intf->dev.driver);
2364                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2365                         retval = -ENOTTY;
2366                 } else {
2367                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2368                         if (retval == -ENOIOCTLCMD)
2369                                 retval = -ENOTTY;
2370                 }
2371         }
2372
2373         /* cleanup and return */
2374         if (retval >= 0
2375                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2376                         && size > 0
2377                         && copy_to_user(ctl->data, buf, size) != 0)
2378                 retval = -EFAULT;
2379
2380         kfree(buf);
2381         return retval;
2382 }
2383
2384 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2385 {
2386         struct usbdevfs_ioctl   ctrl;
2387
2388         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2389                 return -EFAULT;
2390         return proc_ioctl(ps, &ctrl);
2391 }
2392
2393 #ifdef CONFIG_COMPAT
2394 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2395 {
2396         struct usbdevfs_ioctl32 ioc32;
2397         struct usbdevfs_ioctl ctrl;
2398
2399         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2400                 return -EFAULT;
2401         ctrl.ifno = ioc32.ifno;
2402         ctrl.ioctl_code = ioc32.ioctl_code;
2403         ctrl.data = compat_ptr(ioc32.data);
2404         return proc_ioctl(ps, &ctrl);
2405 }
2406 #endif
2407
2408 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2409 {
2410         unsigned portnum;
2411         int rc;
2412
2413         if (get_user(portnum, (unsigned __user *) arg))
2414                 return -EFAULT;
2415         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2416         if (rc == 0)
2417                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2418                         portnum, task_pid_nr(current), current->comm);
2419         return rc;
2420 }
2421
2422 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2423 {
2424         unsigned portnum;
2425
2426         if (get_user(portnum, (unsigned __user *) arg))
2427                 return -EFAULT;
2428         return usb_hub_release_port(ps->dev, portnum, ps);
2429 }
2430
2431 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2432 {
2433         __u32 caps;
2434
2435         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2436                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2437                         USBDEVFS_CAP_DROP_PRIVILEGES |
2438                         USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2439         if (!ps->dev->bus->no_stop_on_short)
2440                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2441         if (ps->dev->bus->sg_tablesize)
2442                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2443
2444         if (put_user(caps, (__u32 __user *)arg))
2445                 return -EFAULT;
2446
2447         return 0;
2448 }
2449
2450 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2451 {
2452         struct usbdevfs_disconnect_claim dc;
2453         struct usb_interface *intf;
2454
2455         if (copy_from_user(&dc, arg, sizeof(dc)))
2456                 return -EFAULT;
2457
2458         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2459         if (!intf)
2460                 return -EINVAL;
2461
2462         if (intf->dev.driver) {
2463                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2464
2465                 if (ps->privileges_dropped)
2466                         return -EACCES;
2467
2468                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2469                                 strncmp(dc.driver, intf->dev.driver->name,
2470                                         sizeof(dc.driver)) != 0)
2471                         return -EBUSY;
2472
2473                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2474                                 strncmp(dc.driver, intf->dev.driver->name,
2475                                         sizeof(dc.driver)) == 0)
2476                         return -EBUSY;
2477
2478                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2479                 usb_driver_release_interface(driver, intf);
2480         }
2481
2482         return claimintf(ps, dc.interface);
2483 }
2484
2485 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2486 {
2487         unsigned num_streams, num_eps;
2488         struct usb_host_endpoint **eps;
2489         struct usb_interface *intf;
2490         int r;
2491
2492         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2493                                    &eps, &intf);
2494         if (r)
2495                 return r;
2496
2497         destroy_async_on_interface(ps,
2498                                    intf->altsetting[0].desc.bInterfaceNumber);
2499
2500         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2501         kfree(eps);
2502         return r;
2503 }
2504
2505 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2506 {
2507         unsigned num_eps;
2508         struct usb_host_endpoint **eps;
2509         struct usb_interface *intf;
2510         int r;
2511
2512         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2513         if (r)
2514                 return r;
2515
2516         destroy_async_on_interface(ps,
2517                                    intf->altsetting[0].desc.bInterfaceNumber);
2518
2519         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2520         kfree(eps);
2521         return r;
2522 }
2523
2524 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2525 {
2526         u32 data;
2527
2528         if (copy_from_user(&data, arg, sizeof(data)))
2529                 return -EFAULT;
2530
2531         /* This is a one way operation. Once privileges are
2532          * dropped, you cannot regain them. You may however reissue
2533          * this ioctl to shrink the allowed interfaces mask.
2534          */
2535         ps->interface_allowed_mask &= data;
2536         ps->privileges_dropped = true;
2537
2538         return 0;
2539 }
2540
2541 static int proc_forbid_suspend(struct usb_dev_state *ps)
2542 {
2543         int ret = 0;
2544
2545         if (ps->suspend_allowed) {
2546                 ret = usb_autoresume_device(ps->dev);
2547                 if (ret == 0)
2548                         ps->suspend_allowed = false;
2549                 else if (ret != -ENODEV)
2550                         ret = -EIO;
2551         }
2552         return ret;
2553 }
2554
2555 static int proc_allow_suspend(struct usb_dev_state *ps)
2556 {
2557         if (!connected(ps))
2558                 return -ENODEV;
2559
2560         WRITE_ONCE(ps->not_yet_resumed, 1);
2561         if (!ps->suspend_allowed) {
2562                 usb_autosuspend_device(ps->dev);
2563                 ps->suspend_allowed = true;
2564         }
2565         return 0;
2566 }
2567
2568 static int proc_wait_for_resume(struct usb_dev_state *ps)
2569 {
2570         int ret;
2571
2572         usb_unlock_device(ps->dev);
2573         ret = wait_event_interruptible(ps->wait_for_resume,
2574                         READ_ONCE(ps->not_yet_resumed) == 0);
2575         usb_lock_device(ps->dev);
2576
2577         if (ret != 0)
2578                 return -EINTR;
2579         return proc_forbid_suspend(ps);
2580 }
2581
2582 /*
2583  * NOTE:  All requests here that have interface numbers as parameters
2584  * are assuming that somehow the configuration has been prevented from
2585  * changing.  But there's no mechanism to ensure that...
2586  */
2587 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2588                                 void __user *p)
2589 {
2590         struct usb_dev_state *ps = file->private_data;
2591         struct inode *inode = file_inode(file);
2592         struct usb_device *dev = ps->dev;
2593         int ret = -ENOTTY;
2594
2595         if (!(file->f_mode & FMODE_WRITE))
2596                 return -EPERM;
2597
2598         usb_lock_device(dev);
2599
2600         /* Reap operations are allowed even after disconnection */
2601         switch (cmd) {
2602         case USBDEVFS_REAPURB:
2603                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2604                 ret = proc_reapurb(ps, p);
2605                 goto done;
2606
2607         case USBDEVFS_REAPURBNDELAY:
2608                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2609                 ret = proc_reapurbnonblock(ps, p);
2610                 goto done;
2611
2612 #ifdef CONFIG_COMPAT
2613         case USBDEVFS_REAPURB32:
2614                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2615                 ret = proc_reapurb_compat(ps, p);
2616                 goto done;
2617
2618         case USBDEVFS_REAPURBNDELAY32:
2619                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2620                 ret = proc_reapurbnonblock_compat(ps, p);
2621                 goto done;
2622 #endif
2623         }
2624
2625         if (!connected(ps)) {
2626                 usb_unlock_device(dev);
2627                 return -ENODEV;
2628         }
2629
2630         switch (cmd) {
2631         case USBDEVFS_CONTROL:
2632                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2633                 ret = proc_control(ps, p);
2634                 if (ret >= 0)
2635                         inode->i_mtime = current_time(inode);
2636                 break;
2637
2638         case USBDEVFS_BULK:
2639                 snoop(&dev->dev, "%s: BULK\n", __func__);
2640                 ret = proc_bulk(ps, p);
2641                 if (ret >= 0)
2642                         inode->i_mtime = current_time(inode);
2643                 break;
2644
2645         case USBDEVFS_RESETEP:
2646                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2647                 ret = proc_resetep(ps, p);
2648                 if (ret >= 0)
2649                         inode->i_mtime = current_time(inode);
2650                 break;
2651
2652         case USBDEVFS_RESET:
2653                 snoop(&dev->dev, "%s: RESET\n", __func__);
2654                 ret = proc_resetdevice(ps);
2655                 break;
2656
2657         case USBDEVFS_CLEAR_HALT:
2658                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2659                 ret = proc_clearhalt(ps, p);
2660                 if (ret >= 0)
2661                         inode->i_mtime = current_time(inode);
2662                 break;
2663
2664         case USBDEVFS_GETDRIVER:
2665                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2666                 ret = proc_getdriver(ps, p);
2667                 break;
2668
2669         case USBDEVFS_CONNECTINFO:
2670                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2671                 ret = proc_connectinfo(ps, p);
2672                 break;
2673
2674         case USBDEVFS_SETINTERFACE:
2675                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2676                 ret = proc_setintf(ps, p);
2677                 break;
2678
2679         case USBDEVFS_SETCONFIGURATION:
2680                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2681                 ret = proc_setconfig(ps, p);
2682                 break;
2683
2684         case USBDEVFS_SUBMITURB:
2685                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2686                 ret = proc_submiturb(ps, p);
2687                 if (ret >= 0)
2688                         inode->i_mtime = current_time(inode);
2689                 break;
2690
2691 #ifdef CONFIG_COMPAT
2692         case USBDEVFS_CONTROL32:
2693                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2694                 ret = proc_control_compat(ps, p);
2695                 if (ret >= 0)
2696                         inode->i_mtime = current_time(inode);
2697                 break;
2698
2699         case USBDEVFS_BULK32:
2700                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2701                 ret = proc_bulk_compat(ps, p);
2702                 if (ret >= 0)
2703                         inode->i_mtime = current_time(inode);
2704                 break;
2705
2706         case USBDEVFS_DISCSIGNAL32:
2707                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2708                 ret = proc_disconnectsignal_compat(ps, p);
2709                 break;
2710
2711         case USBDEVFS_SUBMITURB32:
2712                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2713                 ret = proc_submiturb_compat(ps, p);
2714                 if (ret >= 0)
2715                         inode->i_mtime = current_time(inode);
2716                 break;
2717
2718         case USBDEVFS_IOCTL32:
2719                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2720                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2721                 break;
2722 #endif
2723
2724         case USBDEVFS_DISCARDURB:
2725                 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2726                 ret = proc_unlinkurb(ps, p);
2727                 break;
2728
2729         case USBDEVFS_DISCSIGNAL:
2730                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2731                 ret = proc_disconnectsignal(ps, p);
2732                 break;
2733
2734         case USBDEVFS_CLAIMINTERFACE:
2735                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2736                 ret = proc_claiminterface(ps, p);
2737                 break;
2738
2739         case USBDEVFS_RELEASEINTERFACE:
2740                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2741                 ret = proc_releaseinterface(ps, p);
2742                 break;
2743
2744         case USBDEVFS_IOCTL:
2745                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2746                 ret = proc_ioctl_default(ps, p);
2747                 break;
2748
2749         case USBDEVFS_CLAIM_PORT:
2750                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2751                 ret = proc_claim_port(ps, p);
2752                 break;
2753
2754         case USBDEVFS_RELEASE_PORT:
2755                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2756                 ret = proc_release_port(ps, p);
2757                 break;
2758         case USBDEVFS_GET_CAPABILITIES:
2759                 ret = proc_get_capabilities(ps, p);
2760                 break;
2761         case USBDEVFS_DISCONNECT_CLAIM:
2762                 ret = proc_disconnect_claim(ps, p);
2763                 break;
2764         case USBDEVFS_ALLOC_STREAMS:
2765                 ret = proc_alloc_streams(ps, p);
2766                 break;
2767         case USBDEVFS_FREE_STREAMS:
2768                 ret = proc_free_streams(ps, p);
2769                 break;
2770         case USBDEVFS_DROP_PRIVILEGES:
2771                 ret = proc_drop_privileges(ps, p);
2772                 break;
2773         case USBDEVFS_GET_SPEED:
2774                 ret = ps->dev->speed;
2775                 break;
2776         case USBDEVFS_FORBID_SUSPEND:
2777                 ret = proc_forbid_suspend(ps);
2778                 break;
2779         case USBDEVFS_ALLOW_SUSPEND:
2780                 ret = proc_allow_suspend(ps);
2781                 break;
2782         case USBDEVFS_WAIT_FOR_RESUME:
2783                 ret = proc_wait_for_resume(ps);
2784                 break;
2785         }
2786
2787         /* Handle variable-length commands */
2788         switch (cmd & ~IOCSIZE_MASK) {
2789         case USBDEVFS_CONNINFO_EX(0):
2790                 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2791                 break;
2792         }
2793
2794  done:
2795         usb_unlock_device(dev);
2796         if (ret >= 0)
2797                 inode->i_atime = current_time(inode);
2798         return ret;
2799 }
2800
2801 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2802                         unsigned long arg)
2803 {
2804         int ret;
2805
2806         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2807
2808         return ret;
2809 }
2810
2811 /* No kernel lock - fine */
2812 static __poll_t usbdev_poll(struct file *file,
2813                                 struct poll_table_struct *wait)
2814 {
2815         struct usb_dev_state *ps = file->private_data;
2816         __poll_t mask = 0;
2817
2818         poll_wait(file, &ps->wait, wait);
2819         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2820                 mask |= EPOLLOUT | EPOLLWRNORM;
2821         if (!connected(ps))
2822                 mask |= EPOLLHUP;
2823         if (list_empty(&ps->list))
2824                 mask |= EPOLLERR;
2825         return mask;
2826 }
2827
2828 const struct file_operations usbdev_file_operations = {
2829         .owner =          THIS_MODULE,
2830         .llseek =         no_seek_end_llseek,
2831         .read =           usbdev_read,
2832         .poll =           usbdev_poll,
2833         .unlocked_ioctl = usbdev_ioctl,
2834         .compat_ioctl =   compat_ptr_ioctl,
2835         .mmap =           usbdev_mmap,
2836         .open =           usbdev_open,
2837         .release =        usbdev_release,
2838 };
2839
2840 static void usbdev_remove(struct usb_device *udev)
2841 {
2842         struct usb_dev_state *ps;
2843
2844         /* Protect against simultaneous resume */
2845         mutex_lock(&usbfs_mutex);
2846         while (!list_empty(&udev->filelist)) {
2847                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2848                 destroy_all_async(ps);
2849                 wake_up_all(&ps->wait);
2850                 WRITE_ONCE(ps->not_yet_resumed, 0);
2851                 wake_up_all(&ps->wait_for_resume);
2852                 list_del_init(&ps->list);
2853                 if (ps->discsignr)
2854                         kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2855                                              ps->disc_pid, ps->cred);
2856         }
2857         mutex_unlock(&usbfs_mutex);
2858 }
2859
2860 static int usbdev_notify(struct notifier_block *self,
2861                                unsigned long action, void *dev)
2862 {
2863         switch (action) {
2864         case USB_DEVICE_ADD:
2865                 break;
2866         case USB_DEVICE_REMOVE:
2867                 usbdev_remove(dev);
2868                 break;
2869         }
2870         return NOTIFY_OK;
2871 }
2872
2873 static struct notifier_block usbdev_nb = {
2874         .notifier_call =        usbdev_notify,
2875 };
2876
2877 static struct cdev usb_device_cdev;
2878
2879 int __init usb_devio_init(void)
2880 {
2881         int retval;
2882
2883         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2884                                         "usb_device");
2885         if (retval) {
2886                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2887                 goto out;
2888         }
2889         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2890         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2891         if (retval) {
2892                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2893                        USB_DEVICE_MAJOR);
2894                 goto error_cdev;
2895         }
2896         usb_register_notify(&usbdev_nb);
2897 out:
2898         return retval;
2899
2900 error_cdev:
2901         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2902         goto out;
2903 }
2904
2905 void usb_devio_cleanup(void)
2906 {
2907         usb_unregister_notify(&usbdev_nb);
2908         cdev_del(&usb_device_cdev);
2909         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2910 }