drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/signal.h>
  41 #include <linux/poll.h>
  42 #include <linux/module.h>
  43 #include <linux/string.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <linux/usb/hcd.h>      /* for usbcore internals */
  47 #include <linux/cdev.h>
  48 #include <linux/notifier.h>
  49 #include <linux/security.h>
  50 #include <linux/user_namespace.h>
  51 #include <linux/scatterlist.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/byteorder.h>
  54 #include <linux/moduleparam.h>
  55
  56 #include "usb.h"
  57
  58 #define USB_MAXBUS                      64
  59 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  60 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  61
  62 /* Mutual exclusion for removal, open, and release */
  63 DEFINE_MUTEX(usbfs_mutex);
  64
  65 struct dev_state {
  66         struct list_head list;      /* state list */
  67         struct usb_device *dev;
  68         struct file *file;
  69         spinlock_t lock;            /* protects the async urb lists */
  70         struct list_head async_pending;
  71         struct list_head async_completed;
  72         wait_queue_head_t wait;     /* wake up if a request completed */
  73         unsigned int discsignr;
  74         struct pid *disc_pid;
  75         const struct cred *cred;
  76         void __user *disccontext;
  77         unsigned long ifclaimed;
  78         u32 secid;
  79         u32 disabled_bulk_eps;
  80 };
  81
  82 struct async {
  83         struct list_head asynclist;
  84         struct dev_state *ps;
  85         struct pid *pid;
  86         const struct cred *cred;
  87         unsigned int signr;
  88         unsigned int ifnum;
  89         void __user *userbuffer;
  90         void __user *userurb;
  91         struct urb *urb;
  92         unsigned int mem_usage;
  93         int status;
  94         u32 secid;
  95         u8 bulk_addr;
  96         u8 bulk_status;
  97 };
  98
  99 static bool usbfs_snoop;
 100 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 101 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 102
 103 #define snoop(dev, format, arg...)                              \
 104         do {                                                    \
 105                 if (usbfs_snoop)                                \
 106                         dev_info(dev , format , ## arg);        \
 107         } while (0)
 108
 109 enum snoop_when {
 110         SUBMIT, COMPLETE
 111 };
 112
 113 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 114
 115 /* Limit on the total amount of memory we can allocate for transfers */
 116 static unsigned usbfs_memory_mb = 16;
 117 module_param(usbfs_memory_mb, uint, 0644);
 118 MODULE_PARM_DESC(usbfs_memory_mb,
 119                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 120
 121 /* Hard limit, necessary to avoid aithmetic overflow */
 122 #define USBFS_XFER_MAX          (UINT_MAX / 2 - 1000000)
 123
 124 static atomic_t usbfs_memory_usage;     /* Total memory currently allocated */
 125
 126 /* Check whether it's okay to allocate more memory for a transfer */
 127 static int usbfs_increase_memory_usage(unsigned amount)
 128 {
 129         unsigned lim;
 130
 131         /*
 132          * Convert usbfs_memory_mb to bytes, avoiding overflows.
 133          * 0 means use the hard limit (effectively unlimited).
 134          */
 135         lim = ACCESS_ONCE(usbfs_memory_mb);
 136         if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
 137                 lim = USBFS_XFER_MAX;
 138         else
 139                 lim <<= 20;
 140
 141         atomic_add(amount, &usbfs_memory_usage);
 142         if (atomic_read(&usbfs_memory_usage) <= lim)
 143                 return 0;
 144         atomic_sub(amount, &usbfs_memory_usage);
 145         return -ENOMEM;
 146 }
 147
 148 /* Memory for a transfer is being deallocated */
 149 static void usbfs_decrease_memory_usage(unsigned amount)
 150 {
 151         atomic_sub(amount, &usbfs_memory_usage);
 152 }
 153
 154 static int connected(struct dev_state *ps)
 155 {
 156         return (!list_empty(&ps->list) &&
 157                         ps->dev->state != USB_STATE_NOTATTACHED);
 158 }
 159
 160 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 161 {
 162         loff_t ret;
 163
 164         mutex_lock(&file_inode(file)->i_mutex);
 165
 166         switch (orig) {
 167         case 0:
 168                 file->f_pos = offset;
 169                 ret = file->f_pos;
 170                 break;
 171         case 1:
 172                 file->f_pos += offset;
 173                 ret = file->f_pos;
 174                 break;
 175         case 2:
 176         default:
 177                 ret = -EINVAL;
 178         }
 179
 180         mutex_unlock(&file_inode(file)->i_mutex);
 181         return ret;
 182 }
 183
 184 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 185                            loff_t *ppos)
 186 {
 187         struct dev_state *ps = file->private_data;
 188         struct usb_device *dev = ps->dev;
 189         ssize_t ret = 0;
 190         unsigned len;
 191         loff_t pos;
 192         int i;
 193
 194         pos = *ppos;
 195         usb_lock_device(dev);
 196         if (!connected(ps)) {
 197                 ret = -ENODEV;
 198                 goto err;
 199         } else if (pos < 0) {
 200                 ret = -EINVAL;
 201                 goto err;
 202         }
 203
 204         if (pos < sizeof(struct usb_device_descriptor)) {
 205                 /* 18 bytes - fits on the stack */
 206                 struct usb_device_descriptor temp_desc;
 207
 208                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 209                 le16_to_cpus(&temp_desc.bcdUSB);
 210                 le16_to_cpus(&temp_desc.idVendor);
 211                 le16_to_cpus(&temp_desc.idProduct);
 212                 le16_to_cpus(&temp_desc.bcdDevice);
 213
 214                 len = sizeof(struct usb_device_descriptor) - pos;
 215                 if (len > nbytes)
 216                         len = nbytes;
 217                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 218                         ret = -EFAULT;
 219                         goto err;
 220                 }
 221
 222                 *ppos += len;
 223                 buf += len;
 224                 nbytes -= len;
 225                 ret += len;
 226         }
 227
 228         pos = sizeof(struct usb_device_descriptor);
 229         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 230                 struct usb_config_descriptor *config =
 231                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 232                 unsigned int length = le16_to_cpu(config->wTotalLength);
 233
 234                 if (*ppos < pos + length) {
 235
 236                         /* The descriptor may claim to be longer than it
 237                          * really is.  Here is the actual allocated length. */
 238                         unsigned alloclen =
 239                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 240
 241                         len = length - (*ppos - pos);
 242                         if (len > nbytes)
 243                                 len = nbytes;
 244
 245                         /* Simply don't write (skip over) unallocated parts */
 246                         if (alloclen > (*ppos - pos)) {
 247                                 alloclen -= (*ppos - pos);
 248                                 if (copy_to_user(buf,
 249                                     dev->rawdescriptors[i] + (*ppos - pos),
 250                                     min(len, alloclen))) {
 251                                         ret = -EFAULT;
 252                                         goto err;
 253                                 }
 254                         }
 255
 256                         *ppos += len;
 257                         buf += len;
 258                         nbytes -= len;
 259                         ret += len;
 260                 }
 261
 262                 pos += length;
 263         }
 264
 265 err:
 266         usb_unlock_device(dev);
 267         return ret;
 268 }
 269
 270 /*
 271  * async list handling
 272  */
 273
 274 static struct async *alloc_async(unsigned int numisoframes)
 275 {
 276         struct async *as;
 277
 278         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 279         if (!as)
 280                 return NULL;
 281         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 282         if (!as->urb) {
 283                 kfree(as);
 284                 return NULL;
 285         }
 286         return as;
 287 }
 288
 289 static void free_async(struct async *as)
 290 {
 291         int i;
 292
 293         put_pid(as->pid);
 294         if (as->cred)
 295                 put_cred(as->cred);
 296         for (i = 0; i < as->urb->num_sgs; i++) {
 297                 if (sg_page(&as->urb->sg[i]))
 298                         kfree(sg_virt(&as->urb->sg[i]));
 299         }
 300         kfree(as->urb->sg);
 301         kfree(as->urb->transfer_buffer);
 302         kfree(as->urb->setup_packet);
 303         usb_free_urb(as->urb);
 304         usbfs_decrease_memory_usage(as->mem_usage);
 305         kfree(as);
 306 }
 307
 308 static void async_newpending(struct async *as)
 309 {
 310         struct dev_state *ps = as->ps;
 311         unsigned long flags;
 312
 313         spin_lock_irqsave(&ps->lock, flags);
 314         list_add_tail(&as->asynclist, &ps->async_pending);
 315         spin_unlock_irqrestore(&ps->lock, flags);
 316 }
 317
 318 static void async_removepending(struct async *as)
 319 {
 320         struct dev_state *ps = as->ps;
 321         unsigned long flags;
 322
 323         spin_lock_irqsave(&ps->lock, flags);
 324         list_del_init(&as->asynclist);
 325         spin_unlock_irqrestore(&ps->lock, flags);
 326 }
 327
 328 static struct async *async_getcompleted(struct dev_state *ps)
 329 {
 330         unsigned long flags;
 331         struct async *as = NULL;
 332
 333         spin_lock_irqsave(&ps->lock, flags);
 334         if (!list_empty(&ps->async_completed)) {
 335                 as = list_entry(ps->async_completed.next, struct async,
 336                                 asynclist);
 337                 list_del_init(&as->asynclist);
 338         }
 339         spin_unlock_irqrestore(&ps->lock, flags);
 340         return as;
 341 }
 342
 343 static struct async *async_getpending(struct dev_state *ps,
 344                                              void __user *userurb)
 345 {
 346         struct async *as;
 347
 348         list_for_each_entry(as, &ps->async_pending, asynclist)
 349                 if (as->userurb == userurb) {
 350                         list_del_init(&as->asynclist);
 351                         return as;
 352                 }
 353
 354         return NULL;
 355 }
 356
 357 static void snoop_urb(struct usb_device *udev,
 358                 void __user *userurb, int pipe, unsigned length,
 359                 int timeout_or_status, enum snoop_when when,
 360                 unsigned char *data, unsigned data_len)
 361 {
 362         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 363         static const char *dirs[] = {"out", "in"};
 364         int ep;
 365         const char *t, *d;
 366
 367         if (!usbfs_snoop)
 368                 return;
 369
 370         ep = usb_pipeendpoint(pipe);
 371         t = types[usb_pipetype(pipe)];
 372         d = dirs[!!usb_pipein(pipe)];
 373
 374         if (userurb) {          /* Async */
 375                 if (when == SUBMIT)
 376                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 377                                         "length %u\n",
 378                                         userurb, ep, t, d, length);
 379                 else
 380                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 381                                         "actual_length %u status %d\n",
 382                                         userurb, ep, t, d, length,
 383                                         timeout_or_status);
 384         } else {
 385                 if (when == SUBMIT)
 386                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 387                                         "timeout %d\n",
 388                                         ep, t, d, length, timeout_or_status);
 389                 else
 390                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 391                                         "status %d\n",
 392                                         ep, t, d, length, timeout_or_status);
 393         }
 394
 395         if (data && data_len > 0) {
 396                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 397                         data, data_len, 1);
 398         }
 399 }
 400
 401 static void snoop_urb_data(struct urb *urb, unsigned len)
 402 {
 403         int i, size;
 404
 405         if (!usbfs_snoop)
 406                 return;
 407
 408         if (urb->num_sgs == 0) {
 409                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 410                         urb->transfer_buffer, len, 1);
 411                 return;
 412         }
 413
 414         for (i = 0; i < urb->num_sgs && len; i++) {
 415                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 416                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 417                         sg_virt(&urb->sg[i]), size, 1);
 418                 len -= size;
 419         }
 420 }
 421
 422 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 423 {
 424         unsigned i, len, size;
 425
 426         if (urb->number_of_packets > 0)         /* Isochronous */
 427                 len = urb->transfer_buffer_length;
 428         else                                    /* Non-Isoc */
 429                 len = urb->actual_length;
 430
 431         if (urb->num_sgs == 0) {
 432                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 433                         return -EFAULT;
 434                 return 0;
 435         }
 436
 437         for (i = 0; i < urb->num_sgs && len; i++) {
 438                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 439                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 440                         return -EFAULT;
 441                 userbuffer += size;
 442                 len -= size;
 443         }
 444
 445         return 0;
 446 }
 447
 448 #define AS_CONTINUATION 1
 449 #define AS_UNLINK       2
 450
 451 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
 452 __releases(ps->lock)
 453 __acquires(ps->lock)
 454 {
 455         struct urb *urb;
 456         struct async *as;
 457
 458         /* Mark all the pending URBs that match bulk_addr, up to but not
 459          * including the first one without AS_CONTINUATION.  If such an
 460          * URB is encountered then a new transfer has already started so
 461          * the endpoint doesn't need to be disabled; otherwise it does.
 462          */
 463         list_for_each_entry(as, &ps->async_pending, asynclist) {
 464                 if (as->bulk_addr == bulk_addr) {
 465                         if (as->bulk_status != AS_CONTINUATION)
 466                                 goto rescan;
 467                         as->bulk_status = AS_UNLINK;
 468                         as->bulk_addr = 0;
 469                 }
 470         }
 471         ps->disabled_bulk_eps |= (1 << bulk_addr);
 472
 473         /* Now carefully unlink all the marked pending URBs */
 474  rescan:
 475         list_for_each_entry(as, &ps->async_pending, asynclist) {
 476                 if (as->bulk_status == AS_UNLINK) {
 477                         as->bulk_status = 0;            /* Only once */
 478                         urb = as->urb;
 479                         usb_get_urb(urb);
 480                         spin_unlock(&ps->lock);         /* Allow completions */
 481                         usb_unlink_urb(urb);
 482                         usb_put_urb(urb);
 483                         spin_lock(&ps->lock);
 484                         goto rescan;
 485                 }
 486         }
 487 }
 488
 489 static void async_completed(struct urb *urb)
 490 {
 491         struct async *as = urb->context;
 492         struct dev_state *ps = as->ps;
 493         struct siginfo sinfo;
 494         struct pid *pid = NULL;
 495         u32 secid = 0;
 496         const struct cred *cred = NULL;
 497         int signr;
 498
 499         spin_lock(&ps->lock);
 500         list_move_tail(&as->asynclist, &ps->async_completed);
 501         as->status = urb->status;
 502         signr = as->signr;
 503         if (signr) {
 504                 sinfo.si_signo = as->signr;
 505                 sinfo.si_errno = as->status;
 506                 sinfo.si_code = SI_ASYNCIO;
 507                 sinfo.si_addr = as->userurb;
 508                 pid = get_pid(as->pid);
 509                 cred = get_cred(as->cred);
 510                 secid = as->secid;
 511         }
 512         snoop(&urb->dev->dev, "urb complete\n");
 513         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 514                         as->status, COMPLETE, NULL, 0);
 515         if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
 516                 snoop_urb_data(urb, urb->actual_length);
 517
 518         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 519                         as->status != -ENOENT)
 520                 cancel_bulk_urbs(ps, as->bulk_addr);
 521         spin_unlock(&ps->lock);
 522
 523         if (signr) {
 524                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 525                 put_pid(pid);
 526                 put_cred(cred);
 527         }
 528
 529         wake_up(&ps->wait);
 530 }
 531
 532 static void destroy_async(struct dev_state *ps, struct list_head *list)
 533 {
 534         struct urb *urb;
 535         struct async *as;
 536         unsigned long flags;
 537
 538         spin_lock_irqsave(&ps->lock, flags);
 539         while (!list_empty(list)) {
 540                 as = list_entry(list->next, struct async, asynclist);
 541                 list_del_init(&as->asynclist);
 542                 urb = as->urb;
 543                 usb_get_urb(urb);
 544
 545                 /* drop the spinlock so the completion handler can run */
 546                 spin_unlock_irqrestore(&ps->lock, flags);
 547                 usb_kill_urb(urb);
 548                 usb_put_urb(urb);
 549                 spin_lock_irqsave(&ps->lock, flags);
 550         }
 551         spin_unlock_irqrestore(&ps->lock, flags);
 552 }
 553
 554 static void destroy_async_on_interface(struct dev_state *ps,
 555                                        unsigned int ifnum)
 556 {
 557         struct list_head *p, *q, hitlist;
 558         unsigned long flags;
 559
 560         INIT_LIST_HEAD(&hitlist);
 561         spin_lock_irqsave(&ps->lock, flags);
 562         list_for_each_safe(p, q, &ps->async_pending)
 563                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 564                         list_move_tail(p, &hitlist);
 565         spin_unlock_irqrestore(&ps->lock, flags);
 566         destroy_async(ps, &hitlist);
 567 }
 568
 569 static void destroy_all_async(struct dev_state *ps)
 570 {
 571         destroy_async(ps, &ps->async_pending);
 572 }
 573
 574 /*
 575  * interface claims are made only at the request of user level code,
 576  * which can also release them (explicitly or by closing files).
 577  * they're also undone when devices disconnect.
 578  */
 579
 580 static int driver_probe(struct usb_interface *intf,
 581                         const struct usb_device_id *id)
 582 {
 583         return -ENODEV;
 584 }
 585
 586 static void driver_disconnect(struct usb_interface *intf)
 587 {
 588         struct dev_state *ps = usb_get_intfdata(intf);
 589         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 590
 591         if (!ps)
 592                 return;
 593
 594         /* NOTE:  this relies on usbcore having canceled and completed
 595          * all pending I/O requests; 2.6 does that.
 596          */
 597
 598         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 599                 clear_bit(ifnum, &ps->ifclaimed);
 600         else
 601                 dev_warn(&intf->dev, "interface number %u out of range\n",
 602                          ifnum);
 603
 604         usb_set_intfdata(intf, NULL);
 605
 606         /* force async requests to complete */
 607         destroy_async_on_interface(ps, ifnum);
 608 }
 609
 610 /* The following routines are merely placeholders.  There is no way
 611  * to inform a user task about suspend or resumes.
 612  */
 613 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 614 {
 615         return 0;
 616 }
 617
 618 static int driver_resume(struct usb_interface *intf)
 619 {
 620         return 0;
 621 }
 622
 623 struct usb_driver usbfs_driver = {
 624         .name =         "usbfs",
 625         .probe =        driver_probe,
 626         .disconnect =   driver_disconnect,
 627         .suspend =      driver_suspend,
 628         .resume =       driver_resume,
 629 };
 630
 631 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 632 {
 633         struct usb_device *dev = ps->dev;
 634         struct usb_interface *intf;
 635         int err;
 636
 637         if (ifnum >= 8*sizeof(ps->ifclaimed))
 638                 return -EINVAL;
 639         /* already claimed */
 640         if (test_bit(ifnum, &ps->ifclaimed))
 641                 return 0;
 642
 643         intf = usb_ifnum_to_if(dev, ifnum);
 644         if (!intf)
 645                 err = -ENOENT;
 646         else
 647                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 648         if (err == 0)
 649                 set_bit(ifnum, &ps->ifclaimed);
 650         return err;
 651 }
 652
 653 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 654 {
 655         struct usb_device *dev;
 656         struct usb_interface *intf;
 657         int err;
 658
 659         err = -EINVAL;
 660         if (ifnum >= 8*sizeof(ps->ifclaimed))
 661                 return err;
 662         dev = ps->dev;
 663         intf = usb_ifnum_to_if(dev, ifnum);
 664         if (!intf)
 665                 err = -ENOENT;
 666         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 667                 usb_driver_release_interface(&usbfs_driver, intf);
 668                 err = 0;
 669         }
 670         return err;
 671 }
 672
 673 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 674 {
 675         if (ps->dev->state != USB_STATE_CONFIGURED)
 676                 return -EHOSTUNREACH;
 677         if (ifnum >= 8*sizeof(ps->ifclaimed))
 678                 return -EINVAL;
 679         if (test_bit(ifnum, &ps->ifclaimed))
 680                 return 0;
 681         /* if not yet claimed, claim it for the driver */
 682         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 683                  "interface %u before use\n", task_pid_nr(current),
 684                  current->comm, ifnum);
 685         return claimintf(ps, ifnum);
 686 }
 687
 688 static int findintfep(struct usb_device *dev, unsigned int ep)
 689 {
 690         unsigned int i, j, e;
 691         struct usb_interface *intf;
 692         struct usb_host_interface *alts;
 693         struct usb_endpoint_descriptor *endpt;
 694
 695         if (ep & ~(USB_DIR_IN|0xf))
 696                 return -EINVAL;
 697         if (!dev->actconfig)
 698                 return -ESRCH;
 699         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 700                 intf = dev->actconfig->interface[i];
 701                 for (j = 0; j < intf->num_altsetting; j++) {
 702                         alts = &intf->altsetting[j];
 703                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 704                                 endpt = &alts->endpoint[e].desc;
 705                                 if (endpt->bEndpointAddress == ep)
 706                                         return alts->desc.bInterfaceNumber;
 707                         }
 708                 }
 709         }
 710         return -ENOENT;
 711 }
 712
 713 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 714                            unsigned int request, unsigned int index)
 715 {
 716         int ret = 0;
 717         struct usb_host_interface *alt_setting;
 718
 719         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 720          && ps->dev->state != USB_STATE_ADDRESS
 721          && ps->dev->state != USB_STATE_CONFIGURED)
 722                 return -EHOSTUNREACH;
 723         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 724                 return 0;
 725
 726         /*
 727          * check for the special corner case 'get_device_id' in the printer
 728          * class specification, where wIndex is (interface << 8 | altsetting)
 729          * instead of just interface
 730          */
 731         if (requesttype == 0xa1 && request == 0) {
 732                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 733                                                    index >> 8, index & 0xff);
 734                 if (alt_setting
 735                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 736                         index >>= 8;
 737         }
 738
 739         index &= 0xff;
 740         switch (requesttype & USB_RECIP_MASK) {
 741         case USB_RECIP_ENDPOINT:
 742                 ret = findintfep(ps->dev, index);
 743                 if (ret >= 0)
 744                         ret = checkintf(ps, ret);
 745                 break;
 746
 747         case USB_RECIP_INTERFACE:
 748                 ret = checkintf(ps, index);
 749                 break;
 750         }
 751         return ret;
 752 }
 753
 754 static int match_devt(struct device *dev, void *data)
 755 {
 756         return dev->devt == (dev_t) (unsigned long) data;
 757 }
 758
 759 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 760 {
 761         struct device *dev;
 762
 763         dev = bus_find_device(&usb_bus_type, NULL,
 764                               (void *) (unsigned long) devt, match_devt);
 765         if (!dev)
 766                 return NULL;
 767         return container_of(dev, struct usb_device, dev);
 768 }
 769
 770 /*
 771  * file operations
 772  */
 773 static int usbdev_open(struct inode *inode, struct file *file)
 774 {
 775         struct usb_device *dev = NULL;
 776         struct dev_state *ps;
 777         int ret;
 778
 779         ret = -ENOMEM;
 780         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 781         if (!ps)
 782                 goto out_free_ps;
 783
 784         ret = -ENODEV;
 785
 786         /* Protect against simultaneous removal or release */
 787         mutex_lock(&usbfs_mutex);
 788
 789         /* usbdev device-node */
 790         if (imajor(inode) == USB_DEVICE_MAJOR)
 791                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 792
 793         mutex_unlock(&usbfs_mutex);
 794
 795         if (!dev)
 796                 goto out_free_ps;
 797
 798         usb_lock_device(dev);
 799         if (dev->state == USB_STATE_NOTATTACHED)
 800                 goto out_unlock_device;
 801
 802         ret = usb_autoresume_device(dev);
 803         if (ret)
 804                 goto out_unlock_device;
 805
 806         ps->dev = dev;
 807         ps->file = file;
 808         spin_lock_init(&ps->lock);
 809         INIT_LIST_HEAD(&ps->list);
 810         INIT_LIST_HEAD(&ps->async_pending);
 811         INIT_LIST_HEAD(&ps->async_completed);
 812         init_waitqueue_head(&ps->wait);
 813         ps->discsignr = 0;
 814         ps->disc_pid = get_pid(task_pid(current));
 815         ps->cred = get_current_cred();
 816         ps->disccontext = NULL;
 817         ps->ifclaimed = 0;
 818         security_task_getsecid(current, &ps->secid);
 819         smp_wmb();
 820         list_add_tail(&ps->list, &dev->filelist);
 821         file->private_data = ps;
 822         usb_unlock_device(dev);
 823         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 824                         current->comm);
 825         return ret;
 826
 827  out_unlock_device:
 828         usb_unlock_device(dev);
 829         usb_put_dev(dev);
 830  out_free_ps:
 831         kfree(ps);
 832         return ret;
 833 }
 834
 835 static int usbdev_release(struct inode *inode, struct file *file)
 836 {
 837         struct dev_state *ps = file->private_data;
 838         struct usb_device *dev = ps->dev;
 839         unsigned int ifnum;
 840         struct async *as;
 841
 842         usb_lock_device(dev);
 843         usb_hub_release_all_ports(dev, ps);
 844
 845         list_del_init(&ps->list);
 846
 847         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 848                         ifnum++) {
 849                 if (test_bit(ifnum, &ps->ifclaimed))
 850                         releaseintf(ps, ifnum);
 851         }
 852         destroy_all_async(ps);
 853         usb_autosuspend_device(dev);
 854         usb_unlock_device(dev);
 855         usb_put_dev(dev);
 856         put_pid(ps->disc_pid);
 857         put_cred(ps->cred);
 858
 859         as = async_getcompleted(ps);
 860         while (as) {
 861                 free_async(as);
 862                 as = async_getcompleted(ps);
 863         }
 864         kfree(ps);
 865         return 0;
 866 }
 867
 868 static int proc_control(struct dev_state *ps, void __user *arg)
 869 {
 870         struct usb_device *dev = ps->dev;
 871         struct usbdevfs_ctrltransfer ctrl;
 872         unsigned int tmo;
 873         unsigned char *tbuf;
 874         unsigned wLength;
 875         int i, pipe, ret;
 876
 877         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 878                 return -EFAULT;
 879         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
 880                               ctrl.wIndex);
 881         if (ret)
 882                 return ret;
 883         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 884         if (wLength > PAGE_SIZE)
 885                 return -EINVAL;
 886         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
 887                         sizeof(struct usb_ctrlrequest));
 888         if (ret)
 889                 return ret;
 890         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 891         if (!tbuf) {
 892                 ret = -ENOMEM;
 893                 goto done;
 894         }
 895         tmo = ctrl.timeout;
 896         snoop(&dev->dev, "control urb: bRequestType=%02x "
 897                 "bRequest=%02x wValue=%04x "
 898                 "wIndex=%04x wLength=%04x\n",
 899                 ctrl.bRequestType, ctrl.bRequest,
 900                 __le16_to_cpup(&ctrl.wValue),
 901                 __le16_to_cpup(&ctrl.wIndex),
 902                 __le16_to_cpup(&ctrl.wLength));
 903         if (ctrl.bRequestType & 0x80) {
 904                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 905                                                ctrl.wLength)) {
 906                         ret = -EINVAL;
 907                         goto done;
 908                 }
 909                 pipe = usb_rcvctrlpipe(dev, 0);
 910                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
 911
 912                 usb_unlock_device(dev);
 913                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 914                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 915                                     tbuf, ctrl.wLength, tmo);
 916                 usb_lock_device(dev);
 917                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
 918                           tbuf, max(i, 0));
 919                 if ((i > 0) && ctrl.wLength) {
 920                         if (copy_to_user(ctrl.data, tbuf, i)) {
 921                                 ret = -EFAULT;
 922                                 goto done;
 923                         }
 924                 }
 925         } else {
 926                 if (ctrl.wLength) {
 927                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 928                                 ret = -EFAULT;
 929                                 goto done;
 930                         }
 931                 }
 932                 pipe = usb_sndctrlpipe(dev, 0);
 933                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
 934                         tbuf, ctrl.wLength);
 935
 936                 usb_unlock_device(dev);
 937                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 938                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 939                                     tbuf, ctrl.wLength, tmo);
 940                 usb_lock_device(dev);
 941                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
 942         }
 943         if (i < 0 && i != -EPIPE) {
 944                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 945                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 946                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 947                            ctrl.wLength, i);
 948         }
 949         ret = i;
 950  done:
 951         free_page((unsigned long) tbuf);
 952         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
 953                         sizeof(struct usb_ctrlrequest));
 954         return ret;
 955 }
 956
 957 static int proc_bulk(struct dev_state *ps, void __user *arg)
 958 {
 959         struct usb_device *dev = ps->dev;
 960         struct usbdevfs_bulktransfer bulk;
 961         unsigned int tmo, len1, pipe;
 962         int len2;
 963         unsigned char *tbuf;
 964         int i, ret;
 965
 966         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 967                 return -EFAULT;
 968         ret = findintfep(ps->dev, bulk.ep);
 969         if (ret < 0)
 970                 return ret;
 971         ret = checkintf(ps, ret);
 972         if (ret)
 973                 return ret;
 974         if (bulk.ep & USB_DIR_IN)
 975                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 976         else
 977                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 978         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 979                 return -EINVAL;
 980         len1 = bulk.len;
 981         if (len1 >= USBFS_XFER_MAX)
 982                 return -EINVAL;
 983         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
 984         if (ret)
 985                 return ret;
 986         if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
 987                 ret = -ENOMEM;
 988                 goto done;
 989         }
 990         tmo = bulk.timeout;
 991         if (bulk.ep & 0x80) {
 992                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 993                         ret = -EINVAL;
 994                         goto done;
 995                 }
 996                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
 997
 998                 usb_unlock_device(dev);
 999                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1000                 usb_lock_device(dev);
1001                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1002
1003                 if (!i && len2) {
1004                         if (copy_to_user(bulk.data, tbuf, len2)) {
1005                                 ret = -EFAULT;
1006                                 goto done;
1007                         }
1008                 }
1009         } else {
1010                 if (len1) {
1011                         if (copy_from_user(tbuf, bulk.data, len1)) {
1012                                 ret = -EFAULT;
1013                                 goto done;
1014                         }
1015                 }
1016                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1017
1018                 usb_unlock_device(dev);
1019                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1020                 usb_lock_device(dev);
1021                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1022         }
1023         ret = (i < 0 ? i : len2);
1024  done:
1025         kfree(tbuf);
1026         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1027         return ret;
1028 }
1029
1030 static int proc_resetep(struct dev_state *ps, void __user *arg)
1031 {
1032         unsigned int ep;
1033         int ret;
1034
1035         if (get_user(ep, (unsigned int __user *)arg))
1036                 return -EFAULT;
1037         ret = findintfep(ps->dev, ep);
1038         if (ret < 0)
1039                 return ret;
1040         ret = checkintf(ps, ret);
1041         if (ret)
1042                 return ret;
1043         usb_reset_endpoint(ps->dev, ep);
1044         return 0;
1045 }
1046
1047 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1048 {
1049         unsigned int ep;
1050         int pipe;
1051         int ret;
1052
1053         if (get_user(ep, (unsigned int __user *)arg))
1054                 return -EFAULT;
1055         ret = findintfep(ps->dev, ep);
1056         if (ret < 0)
1057                 return ret;
1058         ret = checkintf(ps, ret);
1059         if (ret)
1060                 return ret;
1061         if (ep & USB_DIR_IN)
1062                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1063         else
1064                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1065
1066         return usb_clear_halt(ps->dev, pipe);
1067 }
1068
1069 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1070 {
1071         struct usbdevfs_getdriver gd;
1072         struct usb_interface *intf;
1073         int ret;
1074
1075         if (copy_from_user(&gd, arg, sizeof(gd)))
1076                 return -EFAULT;
1077         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1078         if (!intf || !intf->dev.driver)
1079                 ret = -ENODATA;
1080         else {
1081                 strlcpy(gd.driver, intf->dev.driver->name,
1082                                 sizeof(gd.driver));
1083                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1084         }
1085         return ret;
1086 }
1087
1088 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1089 {
1090         struct usbdevfs_connectinfo ci = {
1091                 .devnum = ps->dev->devnum,
1092                 .slow = ps->dev->speed == USB_SPEED_LOW
1093         };
1094
1095         if (copy_to_user(arg, &ci, sizeof(ci)))
1096                 return -EFAULT;
1097         return 0;
1098 }
1099
1100 static int proc_resetdevice(struct dev_state *ps)
1101 {
1102         return usb_reset_device(ps->dev);
1103 }
1104
1105 static int proc_setintf(struct dev_state *ps, void __user *arg)
1106 {
1107         struct usbdevfs_setinterface setintf;
1108         int ret;
1109
1110         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1111                 return -EFAULT;
1112         if ((ret = checkintf(ps, setintf.interface)))
1113                 return ret;
1114         return usb_set_interface(ps->dev, setintf.interface,
1115                         setintf.altsetting);
1116 }
1117
1118 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1119 {
1120         int u;
1121         int status = 0;
1122         struct usb_host_config *actconfig;
1123
1124         if (get_user(u, (int __user *)arg))
1125                 return -EFAULT;
1126
1127         actconfig = ps->dev->actconfig;
1128
1129         /* Don't touch the device if any interfaces are claimed.
1130          * It could interfere with other drivers' operations, and if
1131          * an interface is claimed by usbfs it could easily deadlock.
1132          */
1133         if (actconfig) {
1134                 int i;
1135
1136                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1137                         if (usb_interface_claimed(actconfig->interface[i])) {
1138                                 dev_warn(&ps->dev->dev,
1139                                         "usbfs: interface %d claimed by %s "
1140                                         "while '%s' sets config #%d\n",
1141                                         actconfig->interface[i]
1142                                                 ->cur_altsetting
1143                                                 ->desc.bInterfaceNumber,
1144                                         actconfig->interface[i]
1145                                                 ->dev.driver->name,
1146                                         current->comm, u);
1147                                 status = -EBUSY;
1148                                 break;
1149                         }
1150                 }
1151         }
1152
1153         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1154          * so avoid usb_set_configuration()'s kick to sysfs
1155          */
1156         if (status == 0) {
1157                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1158                         status = usb_reset_configuration(ps->dev);
1159                 else
1160                         status = usb_set_configuration(ps->dev, u);
1161         }
1162
1163         return status;
1164 }
1165
1166 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1167                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1168                         void __user *arg)
1169 {
1170         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1171         struct usb_host_endpoint *ep;
1172         struct async *as = NULL;
1173         struct usb_ctrlrequest *dr = NULL;
1174         unsigned int u, totlen, isofrmlen;
1175         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1176         void *buf;
1177
1178         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1179                                 USBDEVFS_URB_SHORT_NOT_OK |
1180                                 USBDEVFS_URB_BULK_CONTINUATION |
1181                                 USBDEVFS_URB_NO_FSBR |
1182                                 USBDEVFS_URB_ZERO_PACKET |
1183                                 USBDEVFS_URB_NO_INTERRUPT))
1184                 return -EINVAL;
1185         if (uurb->buffer_length > 0 && !uurb->buffer)
1186                 return -EINVAL;
1187         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1188             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1189                 ifnum = findintfep(ps->dev, uurb->endpoint);
1190                 if (ifnum < 0)
1191                         return ifnum;
1192                 ret = checkintf(ps, ifnum);
1193                 if (ret)
1194                         return ret;
1195         }
1196         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1197                 is_in = 1;
1198                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1199         } else {
1200                 is_in = 0;
1201                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1202         }
1203         if (!ep)
1204                 return -ENOENT;
1205
1206         u = 0;
1207         switch(uurb->type) {
1208         case USBDEVFS_URB_TYPE_CONTROL:
1209                 if (!usb_endpoint_xfer_control(&ep->desc))
1210                         return -EINVAL;
1211                 /* min 8 byte setup packet */
1212                 if (uurb->buffer_length < 8)
1213                         return -EINVAL;
1214                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1215                 if (!dr)
1216                         return -ENOMEM;
1217                 if (copy_from_user(dr, uurb->buffer, 8)) {
1218                         ret = -EFAULT;
1219                         goto error;
1220                 }
1221                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1222                         ret = -EINVAL;
1223                         goto error;
1224                 }
1225                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1226                                       le16_to_cpup(&dr->wIndex));
1227                 if (ret)
1228                         goto error;
1229                 uurb->number_of_packets = 0;
1230                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1231                 uurb->buffer += 8;
1232                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1233                         is_in = 1;
1234                         uurb->endpoint |= USB_DIR_IN;
1235                 } else {
1236                         is_in = 0;
1237                         uurb->endpoint &= ~USB_DIR_IN;
1238                 }
1239                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1240                         "bRequest=%02x wValue=%04x "
1241                         "wIndex=%04x wLength=%04x\n",
1242                         dr->bRequestType, dr->bRequest,
1243                         __le16_to_cpup(&dr->wValue),
1244                         __le16_to_cpup(&dr->wIndex),
1245                         __le16_to_cpup(&dr->wLength));
1246                 u = sizeof(struct usb_ctrlrequest);
1247                 break;
1248
1249         case USBDEVFS_URB_TYPE_BULK:
1250                 switch (usb_endpoint_type(&ep->desc)) {
1251                 case USB_ENDPOINT_XFER_CONTROL:
1252                 case USB_ENDPOINT_XFER_ISOC:
1253                         return -EINVAL;
1254                 case USB_ENDPOINT_XFER_INT:
1255                         /* allow single-shot interrupt transfers */
1256                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1257                         goto interrupt_urb;
1258                 }
1259                 uurb->number_of_packets = 0;
1260                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1261                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1262                         num_sgs = 0;
1263                 break;
1264
1265         case USBDEVFS_URB_TYPE_INTERRUPT:
1266                 if (!usb_endpoint_xfer_int(&ep->desc))
1267                         return -EINVAL;
1268  interrupt_urb:
1269                 uurb->number_of_packets = 0;
1270                 break;
1271
1272         case USBDEVFS_URB_TYPE_ISO:
1273                 /* arbitrary limit */
1274                 if (uurb->number_of_packets < 1 ||
1275                     uurb->number_of_packets > 128)
1276                         return -EINVAL;
1277                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1278                         return -EINVAL;
1279                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1280                                    uurb->number_of_packets;
1281                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1282                         return -ENOMEM;
1283                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1284                         ret = -EFAULT;
1285                         goto error;
1286                 }
1287                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1288                         /* arbitrary limit,
1289                          * sufficient for USB 2.0 high-bandwidth iso */
1290                         if (isopkt[u].length > 8192) {
1291                                 ret = -EINVAL;
1292                                 goto error;
1293                         }
1294                         totlen += isopkt[u].length;
1295                 }
1296                 u *= sizeof(struct usb_iso_packet_descriptor);
1297                 uurb->buffer_length = totlen;
1298                 break;
1299
1300         default:
1301                 return -EINVAL;
1302         }
1303
1304         if (uurb->buffer_length >= USBFS_XFER_MAX) {
1305                 ret = -EINVAL;
1306                 goto error;
1307         }
1308         if (uurb->buffer_length > 0 &&
1309                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1310                                 uurb->buffer, uurb->buffer_length)) {
1311                 ret = -EFAULT;
1312                 goto error;
1313         }
1314         as = alloc_async(uurb->number_of_packets);
1315         if (!as) {
1316                 ret = -ENOMEM;
1317                 goto error;
1318         }
1319
1320         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1321              num_sgs * sizeof(struct scatterlist);
1322         ret = usbfs_increase_memory_usage(u);
1323         if (ret)
1324                 goto error;
1325         as->mem_usage = u;
1326
1327         if (num_sgs) {
1328                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1329                                       GFP_KERNEL);
1330                 if (!as->urb->sg) {
1331                         ret = -ENOMEM;
1332                         goto error;
1333                 }
1334                 as->urb->num_sgs = num_sgs;
1335                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1336
1337                 totlen = uurb->buffer_length;
1338                 for (i = 0; i < as->urb->num_sgs; i++) {
1339                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1340                         buf = kmalloc(u, GFP_KERNEL);
1341                         if (!buf) {
1342                                 ret = -ENOMEM;
1343                                 goto error;
1344                         }
1345                         sg_set_buf(&as->urb->sg[i], buf, u);
1346
1347                         if (!is_in) {
1348                                 if (copy_from_user(buf, uurb->buffer, u)) {
1349                                         ret = -EFAULT;
1350                                         goto error;
1351                                 }
1352                                 uurb->buffer += u;
1353                         }
1354                         totlen -= u;
1355                 }
1356         } else if (uurb->buffer_length > 0) {
1357                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1358                                 GFP_KERNEL);
1359                 if (!as->urb->transfer_buffer) {
1360                         ret = -ENOMEM;
1361                         goto error;
1362                 }
1363
1364                 if (!is_in) {
1365                         if (copy_from_user(as->urb->transfer_buffer,
1366                                            uurb->buffer,
1367                                            uurb->buffer_length)) {
1368                                 ret = -EFAULT;
1369                                 goto error;
1370                         }
1371                 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1372                         /*
1373                          * Isochronous input data may end up being
1374                          * discontiguous if some of the packets are short.
1375                          * Clear the buffer so that the gaps don't leak
1376                          * kernel data to userspace.
1377                          */
1378                         memset(as->urb->transfer_buffer, 0,
1379                                         uurb->buffer_length);
1380                 }
1381         }
1382         as->urb->dev = ps->dev;
1383         as->urb->pipe = (uurb->type << 30) |
1384                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1385                         (uurb->endpoint & USB_DIR_IN);
1386
1387         /* This tedious sequence is necessary because the URB_* flags
1388          * are internal to the kernel and subject to change, whereas
1389          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1390          */
1391         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1392         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1393                 u |= URB_ISO_ASAP;
1394         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1395                 u |= URB_SHORT_NOT_OK;
1396         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1397                 u |= URB_NO_FSBR;
1398         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1399                 u |= URB_ZERO_PACKET;
1400         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1401                 u |= URB_NO_INTERRUPT;
1402         as->urb->transfer_flags = u;
1403
1404         as->urb->transfer_buffer_length = uurb->buffer_length;
1405         as->urb->setup_packet = (unsigned char *)dr;
1406         dr = NULL;
1407         as->urb->start_frame = uurb->start_frame;
1408         as->urb->number_of_packets = uurb->number_of_packets;
1409         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1410                         ps->dev->speed == USB_SPEED_HIGH)
1411                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1412         else
1413                 as->urb->interval = ep->desc.bInterval;
1414         as->urb->context = as;
1415         as->urb->complete = async_completed;
1416         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1417                 as->urb->iso_frame_desc[u].offset = totlen;
1418                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1419                 totlen += isopkt[u].length;
1420         }
1421         kfree(isopkt);
1422         isopkt = NULL;
1423         as->ps = ps;
1424         as->userurb = arg;
1425         if (is_in && uurb->buffer_length > 0)
1426                 as->userbuffer = uurb->buffer;
1427         else
1428                 as->userbuffer = NULL;
1429         as->signr = uurb->signr;
1430         as->ifnum = ifnum;
1431         as->pid = get_pid(task_pid(current));
1432         as->cred = get_current_cred();
1433         security_task_getsecid(current, &as->secid);
1434         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1435                         as->urb->transfer_buffer_length, 0, SUBMIT,
1436                         NULL, 0);
1437         if (!is_in)
1438                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1439
1440         async_newpending(as);
1441
1442         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1443                 spin_lock_irq(&ps->lock);
1444
1445                 /* Not exactly the endpoint address; the direction bit is
1446                  * shifted to the 0x10 position so that the value will be
1447                  * between 0 and 31.
1448                  */
1449                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1450                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1451                                 >> 3);
1452
1453                 /* If this bulk URB is the start of a new transfer, re-enable
1454                  * the endpoint.  Otherwise mark it as a continuation URB.
1455                  */
1456                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1457                         as->bulk_status = AS_CONTINUATION;
1458                 else
1459                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1460
1461                 /* Don't accept continuation URBs if the endpoint is
1462                  * disabled because of an earlier error.
1463                  */
1464                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1465                         ret = -EREMOTEIO;
1466                 else
1467                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1468                 spin_unlock_irq(&ps->lock);
1469         } else {
1470                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1471         }
1472
1473         if (ret) {
1474                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1475                            "usbfs: usb_submit_urb returned %d\n", ret);
1476                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1477                                 0, ret, COMPLETE, NULL, 0);
1478                 async_removepending(as);
1479                 goto error;
1480         }
1481         return 0;
1482
1483  error:
1484         kfree(isopkt);
1485         kfree(dr);
1486         if (as)
1487                 free_async(as);
1488         return ret;
1489 }
1490
1491 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1492 {
1493         struct usbdevfs_urb uurb;
1494
1495         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1496                 return -EFAULT;
1497
1498         return proc_do_submiturb(ps, &uurb,
1499                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1500                         arg);
1501 }
1502
1503 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1504 {
1505         struct urb *urb;
1506         struct async *as;
1507         unsigned long flags;
1508
1509         spin_lock_irqsave(&ps->lock, flags);
1510         as = async_getpending(ps, arg);
1511         if (!as) {
1512                 spin_unlock_irqrestore(&ps->lock, flags);
1513                 return -EINVAL;
1514         }
1515
1516         urb = as->urb;
1517         usb_get_urb(urb);
1518         spin_unlock_irqrestore(&ps->lock, flags);
1519
1520         usb_kill_urb(urb);
1521         usb_put_urb(urb);
1522
1523         return 0;
1524 }
1525
1526 static int processcompl(struct async *as, void __user * __user *arg)
1527 {
1528         struct urb *urb = as->urb;
1529         struct usbdevfs_urb __user *userurb = as->userurb;
1530         void __user *addr = as->userurb;
1531         unsigned int i;
1532
1533         if (as->userbuffer && urb->actual_length) {
1534                 if (copy_urb_data_to_user(as->userbuffer, urb))
1535                         goto err_out;
1536         }
1537         if (put_user(as->status, &userurb->status))
1538                 goto err_out;
1539         if (put_user(urb->actual_length, &userurb->actual_length))
1540                 goto err_out;
1541         if (put_user(urb->error_count, &userurb->error_count))
1542                 goto err_out;
1543
1544         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1545                 for (i = 0; i < urb->number_of_packets; i++) {
1546                         if (put_user(urb->iso_frame_desc[i].actual_length,
1547                                      &userurb->iso_frame_desc[i].actual_length))
1548                                 goto err_out;
1549                         if (put_user(urb->iso_frame_desc[i].status,
1550                                      &userurb->iso_frame_desc[i].status))
1551                                 goto err_out;
1552                 }
1553         }
1554
1555         if (put_user(addr, (void __user * __user *)arg))
1556                 return -EFAULT;
1557         return 0;
1558
1559 err_out:
1560         return -EFAULT;
1561 }
1562
1563 static struct async *reap_as(struct dev_state *ps)
1564 {
1565         DECLARE_WAITQUEUE(wait, current);
1566         struct async *as = NULL;
1567         struct usb_device *dev = ps->dev;
1568
1569         add_wait_queue(&ps->wait, &wait);
1570         for (;;) {
1571                 __set_current_state(TASK_INTERRUPTIBLE);
1572                 as = async_getcompleted(ps);
1573                 if (as)
1574                         break;
1575                 if (signal_pending(current))
1576                         break;
1577                 usb_unlock_device(dev);
1578                 schedule();
1579                 usb_lock_device(dev);
1580         }
1581         remove_wait_queue(&ps->wait, &wait);
1582         set_current_state(TASK_RUNNING);
1583         return as;
1584 }
1585
1586 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1587 {
1588         struct async *as = reap_as(ps);
1589         if (as) {
1590                 int retval = processcompl(as, (void __user * __user *)arg);
1591                 free_async(as);
1592                 return retval;
1593         }
1594         if (signal_pending(current))
1595                 return -EINTR;
1596         return -EIO;
1597 }
1598
1599 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1600 {
1601         int retval;
1602         struct async *as;
1603
1604         as = async_getcompleted(ps);
1605         retval = -EAGAIN;
1606         if (as) {
1607                 retval = processcompl(as, (void __user * __user *)arg);
1608                 free_async(as);
1609         }
1610         return retval;
1611 }
1612
1613 #ifdef CONFIG_COMPAT
1614 static int proc_control_compat(struct dev_state *ps,
1615                                 struct usbdevfs_ctrltransfer32 __user *p32)
1616 {
1617         struct usbdevfs_ctrltransfer __user *p;
1618         __u32 udata;
1619         p = compat_alloc_user_space(sizeof(*p));
1620         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1621             get_user(udata, &p32->data) ||
1622             put_user(compat_ptr(udata), &p->data))
1623                 return -EFAULT;
1624         return proc_control(ps, p);
1625 }
1626
1627 static int proc_bulk_compat(struct dev_state *ps,
1628                         struct usbdevfs_bulktransfer32 __user *p32)
1629 {
1630         struct usbdevfs_bulktransfer __user *p;
1631         compat_uint_t n;
1632         compat_caddr_t addr;
1633
1634         p = compat_alloc_user_space(sizeof(*p));
1635
1636         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1637             get_user(n, &p32->len) || put_user(n, &p->len) ||
1638             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1639             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1640                 return -EFAULT;
1641
1642         return proc_bulk(ps, p);
1643 }
1644 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1645 {
1646         struct usbdevfs_disconnectsignal32 ds;
1647
1648         if (copy_from_user(&ds, arg, sizeof(ds)))
1649                 return -EFAULT;
1650         ps->discsignr = ds.signr;
1651         ps->disccontext = compat_ptr(ds.context);
1652         return 0;
1653 }
1654
1655 static int get_urb32(struct usbdevfs_urb *kurb,
1656                      struct usbdevfs_urb32 __user *uurb)
1657 {
1658         __u32  uptr;
1659         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1660             __get_user(kurb->type, &uurb->type) ||
1661             __get_user(kurb->endpoint, &uurb->endpoint) ||
1662             __get_user(kurb->status, &uurb->status) ||
1663             __get_user(kurb->flags, &uurb->flags) ||
1664             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1665             __get_user(kurb->actual_length, &uurb->actual_length) ||
1666             __get_user(kurb->start_frame, &uurb->start_frame) ||
1667             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1668             __get_user(kurb->error_count, &uurb->error_count) ||
1669             __get_user(kurb->signr, &uurb->signr))
1670                 return -EFAULT;
1671
1672         if (__get_user(uptr, &uurb->buffer))
1673                 return -EFAULT;
1674         kurb->buffer = compat_ptr(uptr);
1675         if (__get_user(uptr, &uurb->usercontext))
1676                 return -EFAULT;
1677         kurb->usercontext = compat_ptr(uptr);
1678
1679         return 0;
1680 }
1681
1682 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1683 {
1684         struct usbdevfs_urb uurb;
1685
1686         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1687                 return -EFAULT;
1688
1689         return proc_do_submiturb(ps, &uurb,
1690                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1691                         arg);
1692 }
1693
1694 static int processcompl_compat(struct async *as, void __user * __user *arg)
1695 {
1696         struct urb *urb = as->urb;
1697         struct usbdevfs_urb32 __user *userurb = as->userurb;
1698         void __user *addr = as->userurb;
1699         unsigned int i;
1700
1701         if (as->userbuffer && urb->actual_length) {
1702                 if (copy_urb_data_to_user(as->userbuffer, urb))
1703                         return -EFAULT;
1704         }
1705         if (put_user(as->status, &userurb->status))
1706                 return -EFAULT;
1707         if (put_user(urb->actual_length, &userurb->actual_length))
1708                 return -EFAULT;
1709         if (put_user(urb->error_count, &userurb->error_count))
1710                 return -EFAULT;
1711
1712         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1713                 for (i = 0; i < urb->number_of_packets; i++) {
1714                         if (put_user(urb->iso_frame_desc[i].actual_length,
1715                                      &userurb->iso_frame_desc[i].actual_length))
1716                                 return -EFAULT;
1717                         if (put_user(urb->iso_frame_desc[i].status,
1718                                      &userurb->iso_frame_desc[i].status))
1719                                 return -EFAULT;
1720                 }
1721         }
1722
1723         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1724                 return -EFAULT;
1725         return 0;
1726 }
1727
1728 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1729 {
1730         struct async *as = reap_as(ps);
1731         if (as) {
1732                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1733                 free_async(as);
1734                 return retval;
1735         }
1736         if (signal_pending(current))
1737                 return -EINTR;
1738         return -EIO;
1739 }
1740
1741 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1742 {
1743         int retval;
1744         struct async *as;
1745
1746         retval = -EAGAIN;
1747         as = async_getcompleted(ps);
1748         if (as) {
1749                 retval = processcompl_compat(as, (void __user * __user *)arg);
1750                 free_async(as);
1751         }
1752         return retval;
1753 }
1754
1755
1756 #endif
1757
1758 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1759 {
1760         struct usbdevfs_disconnectsignal ds;
1761
1762         if (copy_from_user(&ds, arg, sizeof(ds)))
1763                 return -EFAULT;
1764         ps->discsignr = ds.signr;
1765         ps->disccontext = ds.context;
1766         return 0;
1767 }
1768
1769 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1770 {
1771         unsigned int ifnum;
1772
1773         if (get_user(ifnum, (unsigned int __user *)arg))
1774                 return -EFAULT;
1775         return claimintf(ps, ifnum);
1776 }
1777
1778 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1779 {
1780         unsigned int ifnum;
1781         int ret;
1782
1783         if (get_user(ifnum, (unsigned int __user *)arg))
1784                 return -EFAULT;
1785         if ((ret = releaseintf(ps, ifnum)) < 0)
1786                 return ret;
1787         destroy_async_on_interface (ps, ifnum);
1788         return 0;
1789 }
1790
1791 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1792 {
1793         int                     size;
1794         void                    *buf = NULL;
1795         int                     retval = 0;
1796         struct usb_interface    *intf = NULL;
1797         struct usb_driver       *driver = NULL;
1798
1799         /* alloc buffer */
1800         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1801                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1802                         return -ENOMEM;
1803                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1804                         if (copy_from_user(buf, ctl->data, size)) {
1805                                 kfree(buf);
1806                                 return -EFAULT;
1807                         }
1808                 } else {
1809                         memset(buf, 0, size);
1810                 }
1811         }
1812
1813         if (!connected(ps)) {
1814                 kfree(buf);
1815                 return -ENODEV;
1816         }
1817
1818         if (ps->dev->state != USB_STATE_CONFIGURED)
1819                 retval = -EHOSTUNREACH;
1820         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1821                 retval = -EINVAL;
1822         else switch (ctl->ioctl_code) {
1823
1824         /* disconnect kernel driver from interface */
1825         case USBDEVFS_DISCONNECT:
1826                 if (intf->dev.driver) {
1827                         driver = to_usb_driver(intf->dev.driver);
1828                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1829                         usb_driver_release_interface(driver, intf);
1830                 } else
1831                         retval = -ENODATA;
1832                 break;
1833
1834         /* let kernel drivers try to (re)bind to the interface */
1835         case USBDEVFS_CONNECT:
1836                 if (!intf->dev.driver)
1837                         retval = device_attach(&intf->dev);
1838                 else
1839                         retval = -EBUSY;
1840                 break;
1841
1842         /* talk directly to the interface's driver */
1843         default:
1844                 if (intf->dev.driver)
1845                         driver = to_usb_driver(intf->dev.driver);
1846                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1847                         retval = -ENOTTY;
1848                 } else {
1849                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1850                         if (retval == -ENOIOCTLCMD)
1851                                 retval = -ENOTTY;
1852                 }
1853         }
1854
1855         /* cleanup and return */
1856         if (retval >= 0
1857                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1858                         && size > 0
1859                         && copy_to_user(ctl->data, buf, size) != 0)
1860                 retval = -EFAULT;
1861
1862         kfree(buf);
1863         return retval;
1864 }
1865
1866 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1867 {
1868         struct usbdevfs_ioctl   ctrl;
1869
1870         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1871                 return -EFAULT;
1872         return proc_ioctl(ps, &ctrl);
1873 }
1874
1875 #ifdef CONFIG_COMPAT
1876 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1877 {
1878         struct usbdevfs_ioctl32 __user *uioc;
1879         struct usbdevfs_ioctl ctrl;
1880         u32 udata;
1881
1882         uioc = compat_ptr((long)arg);
1883         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1884             __get_user(ctrl.ifno, &uioc->ifno) ||
1885             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1886             __get_user(udata, &uioc->data))
1887                 return -EFAULT;
1888         ctrl.data = compat_ptr(udata);
1889
1890         return proc_ioctl(ps, &ctrl);
1891 }
1892 #endif
1893
1894 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1895 {
1896         unsigned portnum;
1897         int rc;
1898
1899         if (get_user(portnum, (unsigned __user *) arg))
1900                 return -EFAULT;
1901         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1902         if (rc == 0)
1903                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1904                         portnum, task_pid_nr(current), current->comm);
1905         return rc;
1906 }
1907
1908 static int proc_release_port(struct dev_state *ps, void __user *arg)
1909 {
1910         unsigned portnum;
1911
1912         if (get_user(portnum, (unsigned __user *) arg))
1913                 return -EFAULT;
1914         return usb_hub_release_port(ps->dev, portnum, ps);
1915 }
1916
1917 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1918 {
1919         __u32 caps;
1920
1921         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
1922         if (!ps->dev->bus->no_stop_on_short)
1923                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1924         if (ps->dev->bus->sg_tablesize)
1925                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1926
1927         if (put_user(caps, (__u32 __user *)arg))
1928                 return -EFAULT;
1929
1930         return 0;
1931 }
1932
1933 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1934 {
1935         struct usbdevfs_disconnect_claim dc;
1936         struct usb_interface *intf;
1937
1938         if (copy_from_user(&dc, arg, sizeof(dc)))
1939                 return -EFAULT;
1940
1941         intf = usb_ifnum_to_if(ps->dev, dc.interface);
1942         if (!intf)
1943                 return -EINVAL;
1944
1945         if (intf->dev.driver) {
1946                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1947
1948                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1949                                 strncmp(dc.driver, intf->dev.driver->name,
1950                                         sizeof(dc.driver)) != 0)
1951                         return -EBUSY;
1952
1953                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1954                                 strncmp(dc.driver, intf->dev.driver->name,
1955                                         sizeof(dc.driver)) == 0)
1956                         return -EBUSY;
1957
1958                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1959                 usb_driver_release_interface(driver, intf);
1960         }
1961
1962         return claimintf(ps, dc.interface);
1963 }
1964
1965 /*
1966  * NOTE:  All requests here that have interface numbers as parameters
1967  * are assuming that somehow the configuration has been prevented from
1968  * changing.  But there's no mechanism to ensure that...
1969  */
1970 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1971                                 void __user *p)
1972 {
1973         struct dev_state *ps = file->private_data;
1974         struct inode *inode = file_inode(file);
1975         struct usb_device *dev = ps->dev;
1976         int ret = -ENOTTY;
1977
1978         if (!(file->f_mode & FMODE_WRITE))
1979                 return -EPERM;
1980
1981         usb_lock_device(dev);
1982         if (!connected(ps)) {
1983                 usb_unlock_device(dev);
1984                 return -ENODEV;
1985         }
1986
1987         switch (cmd) {
1988         case USBDEVFS_CONTROL:
1989                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1990                 ret = proc_control(ps, p);
1991                 if (ret >= 0)
1992                         inode->i_mtime = CURRENT_TIME;
1993                 break;
1994
1995         case USBDEVFS_BULK:
1996                 snoop(&dev->dev, "%s: BULK\n", __func__);
1997                 ret = proc_bulk(ps, p);
1998                 if (ret >= 0)
1999                         inode->i_mtime = CURRENT_TIME;
2000                 break;
2001
2002         case USBDEVFS_RESETEP:
2003                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2004                 ret = proc_resetep(ps, p);
2005                 if (ret >= 0)
2006                         inode->i_mtime = CURRENT_TIME;
2007                 break;
2008
2009         case USBDEVFS_RESET:
2010                 snoop(&dev->dev, "%s: RESET\n", __func__);
2011                 ret = proc_resetdevice(ps);
2012                 break;
2013
2014         case USBDEVFS_CLEAR_HALT:
2015                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2016                 ret = proc_clearhalt(ps, p);
2017                 if (ret >= 0)
2018                         inode->i_mtime = CURRENT_TIME;
2019                 break;
2020
2021         case USBDEVFS_GETDRIVER:
2022                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2023                 ret = proc_getdriver(ps, p);
2024                 break;
2025
2026         case USBDEVFS_CONNECTINFO:
2027                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2028                 ret = proc_connectinfo(ps, p);
2029                 break;
2030
2031         case USBDEVFS_SETINTERFACE:
2032                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2033                 ret = proc_setintf(ps, p);
2034                 break;
2035
2036         case USBDEVFS_SETCONFIGURATION:
2037                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2038                 ret = proc_setconfig(ps, p);
2039                 break;
2040
2041         case USBDEVFS_SUBMITURB:
2042                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2043                 ret = proc_submiturb(ps, p);
2044                 if (ret >= 0)
2045                         inode->i_mtime = CURRENT_TIME;
2046                 break;
2047
2048 #ifdef CONFIG_COMPAT
2049         case USBDEVFS_CONTROL32:
2050                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2051                 ret = proc_control_compat(ps, p);
2052                 if (ret >= 0)
2053                         inode->i_mtime = CURRENT_TIME;
2054                 break;
2055
2056         case USBDEVFS_BULK32:
2057                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2058                 ret = proc_bulk_compat(ps, p);
2059                 if (ret >= 0)
2060                         inode->i_mtime = CURRENT_TIME;
2061                 break;
2062
2063         case USBDEVFS_DISCSIGNAL32:
2064                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2065                 ret = proc_disconnectsignal_compat(ps, p);
2066                 break;
2067
2068         case USBDEVFS_SUBMITURB32:
2069                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2070                 ret = proc_submiturb_compat(ps, p);
2071                 if (ret >= 0)
2072                         inode->i_mtime = CURRENT_TIME;
2073                 break;
2074
2075         case USBDEVFS_REAPURB32:
2076                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2077                 ret = proc_reapurb_compat(ps, p);
2078                 break;
2079
2080         case USBDEVFS_REAPURBNDELAY32:
2081                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2082                 ret = proc_reapurbnonblock_compat(ps, p);
2083                 break;
2084
2085         case USBDEVFS_IOCTL32:
2086                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2087                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2088                 break;
2089 #endif
2090
2091         case USBDEVFS_DISCARDURB:
2092                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2093                 ret = proc_unlinkurb(ps, p);
2094                 break;
2095
2096         case USBDEVFS_REAPURB:
2097                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2098                 ret = proc_reapurb(ps, p);
2099                 break;
2100
2101         case USBDEVFS_REAPURBNDELAY:
2102                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2103                 ret = proc_reapurbnonblock(ps, p);
2104                 break;
2105
2106         case USBDEVFS_DISCSIGNAL:
2107                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2108                 ret = proc_disconnectsignal(ps, p);
2109                 break;
2110
2111         case USBDEVFS_CLAIMINTERFACE:
2112                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2113                 ret = proc_claiminterface(ps, p);
2114                 break;
2115
2116         case USBDEVFS_RELEASEINTERFACE:
2117                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2118                 ret = proc_releaseinterface(ps, p);
2119                 break;
2120
2121         case USBDEVFS_IOCTL:
2122                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2123                 ret = proc_ioctl_default(ps, p);
2124                 break;
2125
2126         case USBDEVFS_CLAIM_PORT:
2127                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2128                 ret = proc_claim_port(ps, p);
2129                 break;
2130
2131         case USBDEVFS_RELEASE_PORT:
2132                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2133                 ret = proc_release_port(ps, p);
2134                 break;
2135         case USBDEVFS_GET_CAPABILITIES:
2136                 ret = proc_get_capabilities(ps, p);
2137                 break;
2138         case USBDEVFS_DISCONNECT_CLAIM:
2139                 ret = proc_disconnect_claim(ps, p);
2140                 break;
2141         }
2142         usb_unlock_device(dev);
2143         if (ret >= 0)
2144                 inode->i_atime = CURRENT_TIME;
2145         return ret;
2146 }
2147
2148 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2149                         unsigned long arg)
2150 {
2151         int ret;
2152
2153         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2154
2155         return ret;
2156 }
2157
2158 #ifdef CONFIG_COMPAT
2159 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2160                         unsigned long arg)
2161 {
2162         int ret;
2163
2164         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2165
2166         return ret;
2167 }
2168 #endif
2169
2170 /* No kernel lock - fine */
2171 static unsigned int usbdev_poll(struct file *file,
2172                                 struct poll_table_struct *wait)
2173 {
2174         struct dev_state *ps = file->private_data;
2175         unsigned int mask = 0;
2176
2177         poll_wait(file, &ps->wait, wait);
2178         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2179                 mask |= POLLOUT | POLLWRNORM;
2180         if (!connected(ps))
2181                 mask |= POLLERR | POLLHUP;
2182         return mask;
2183 }
2184
2185 const struct file_operations usbdev_file_operations = {
2186         .owner =          THIS_MODULE,
2187         .llseek =         usbdev_lseek,
2188         .read =           usbdev_read,
2189         .poll =           usbdev_poll,
2190         .unlocked_ioctl = usbdev_ioctl,
2191 #ifdef CONFIG_COMPAT
2192         .compat_ioctl =   usbdev_compat_ioctl,
2193 #endif
2194         .open =           usbdev_open,
2195         .release =        usbdev_release,
2196 };
2197
2198 static void usbdev_remove(struct usb_device *udev)
2199 {
2200         struct dev_state *ps;
2201         struct siginfo sinfo;
2202
2203         while (!list_empty(&udev->filelist)) {
2204                 ps = list_entry(udev->filelist.next, struct dev_state, list);
2205                 destroy_all_async(ps);
2206                 wake_up_all(&ps->wait);
2207                 list_del_init(&ps->list);
2208                 if (ps->discsignr) {
2209                         sinfo.si_signo = ps->discsignr;
2210                         sinfo.si_errno = EPIPE;
2211                         sinfo.si_code = SI_ASYNCIO;
2212                         sinfo.si_addr = ps->disccontext;
2213                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2214                                         ps->disc_pid, ps->cred, ps->secid);
2215                 }
2216         }
2217 }
2218
2219 static int usbdev_notify(struct notifier_block *self,
2220                                unsigned long action, void *dev)
2221 {
2222         switch (action) {
2223         case USB_DEVICE_ADD:
2224                 break;
2225         case USB_DEVICE_REMOVE:
2226                 usbdev_remove(dev);
2227                 break;
2228         }
2229         return NOTIFY_OK;
2230 }
2231
2232 static struct notifier_block usbdev_nb = {
2233         .notifier_call =        usbdev_notify,
2234 };
2235
2236 static struct cdev usb_device_cdev;
2237
2238 int __init usb_devio_init(void)
2239 {
2240         int retval;
2241
2242         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2243                                         "usb_device");
2244         if (retval) {
2245                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2246                 goto out;
2247         }
2248         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2249         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2250         if (retval) {
2251                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2252                        USB_DEVICE_MAJOR);
2253                 goto error_cdev;
2254         }
2255         usb_register_notify(&usbdev_nb);
2256 out:
2257         return retval;
2258
2259 error_cdev:
2260         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2261         goto out;
2262 }
2263
2264 void usb_devio_cleanup(void)
2265 {
2266         usb_unregister_notify(&usbdev_nb);
2267         cdev_del(&usb_device_cdev);
2268         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2269 }