media: pwc: Use correct device for DMA

This fixes the following newly introduced warning:

[   15.518253] ------------[ cut here ]------------
[   15.518941] WARNING: CPU: 0 PID: 246 at kernel/dma/mapping.c:149 dma_map_page_attrs+0x1a8/0x1d0
[   15.520634] Modules linked in: pwc videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc efivarfs
[   15.522335] CPU: 0 PID: 246 Comm: v4l2-test Not tainted 5.11.0-rc1+ #1
[   15.523281] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
[   15.524438] RIP: 0010:dma_map_page_attrs+0x1a8/0x1d0
[   15.525135] Code: 10 5b 5d 41 5c 41 5d c3 4d 89 d0 eb d7 4d 89 c8 89 e9 48 89 da e8 68 29 00 00 eb d1 48 89 f2 48 2b 50 18 48 89 d0 eb 83 0f 0b <0f> 0b 48 c7 c0 ff ff ff ff eb b8 48 89 d9 48 8b 40 40 e8 61 69 d2
[   15.527938] RSP: 0018:ffffa2694047bca8 EFLAGS: 00010246
[   15.528716] RAX: 0000000000000000 RBX: 0000000000002580 RCX: 0000000000000000
[   15.529782] RDX: 0000000000000000 RSI: ffffcdce000ecc00 RDI: ffffa0b4bdb888a0
[   15.530849] RBP: 0000000000000002 R08: 0000000000000002 R09: 0000000000000000
[   15.531881] R10: 0000000000000004 R11: 000000000002d8c0 R12: 0000000000000000
[   15.532911] R13: ffffa0b4bdb88800 R14: ffffa0b483820000 R15: ffffa0b4bdb888a0
[   15.533942] FS:  00007fc5fbb5e4c0(0000) GS:ffffa0b4fc000000(0000) knlGS:0000000000000000
[   15.535141] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.535988] CR2: 00007fc5fb6ea138 CR3: 0000000003812000 CR4: 00000000001506f0
[   15.537025] Call Trace:
[   15.537425]  start_streaming+0x2e9/0x4b0 [pwc]
[   15.538143]  vb2_start_streaming+0x5e/0x110 [videobuf2_common]
[   15.538989]  vb2_core_streamon+0x107/0x140 [videobuf2_common]
[   15.539831]  __video_do_ioctl+0x18f/0x4a0 [videodev]
[   15.540670]  video_usercopy+0x13a/0x5b0 [videodev]
[   15.541349]  ? video_put_user+0x230/0x230 [videodev]
[   15.542096]  ? selinux_file_ioctl+0x143/0x200
[   15.542752]  v4l2_ioctl+0x40/0x50 [videodev]
[   15.543360]  __x64_sys_ioctl+0x89/0xc0
[   15.543930]  do_syscall_64+0x33/0x40
[   15.544448]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   15.545236] RIP: 0033:0x7fc5fb671587
[   15.545780] Code: b3 66 90 48 8b 05 11 49 2c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 48 2c 00 f7 d8 64 89 01 48
[   15.548486] RSP: 002b:00007fff0f71f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   15.549578] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fc5fb671587
[   15.550664] RDX: 00007fff0f71f060 RSI: 0000000040045612 RDI: 0000000000000003
[   15.551706] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   15.552738] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff0f71f060
[   15.553817] R13: 00007fff0f71f1d0 R14: 0000000000de1270 R15: 0000000000000000
[   15.554914] ---[ end trace 7be03122966c2486 ]---

Fixes: 1161db6776bd ("media: usb: pwc: Don't use coherent DMA buffers for ISO transfer")
Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/usb/pwc/pwc-if.c b/drivers/media/usb/pwc/pwc-if.c
index 6186963..5e3339c 100644 (file)
--- a/drivers/media/usb/pwc/pwc-if.c
+++ b/drivers/media/usb/pwc/pwc-if.c
@@ -155,16 +155,17 @@ static const struct video_device pwc_template = {
 /***************************************************************************/
 /* Private functions */
 
-static void *pwc_alloc_urb_buffer(struct device *dev,
+static void *pwc_alloc_urb_buffer(struct usb_device *dev,
                                  size_t size, dma_addr_t *dma_handle)
 {
+       struct device *dmadev = dev->bus->sysdev;
        void *buffer = kmalloc(size, GFP_KERNEL);
 
        if (!buffer)
                return NULL;
 
-       *dma_handle = dma_map_single(dev, buffer, size, DMA_FROM_DEVICE);
-       if (dma_mapping_error(dev, *dma_handle)) {
+       *dma_handle = dma_map_single(dmadev, buffer, size, DMA_FROM_DEVICE);
+       if (dma_mapping_error(dmadev, *dma_handle)) {
                kfree(buffer);
                return NULL;
        }
@@ -172,12 +173,14 @@ static void *pwc_alloc_urb_buffer(struct device *dev,
        return buffer;
 }
 
-static void pwc_free_urb_buffer(struct device *dev,
+static void pwc_free_urb_buffer(struct usb_device *dev,
                                size_t size,
                                void *buffer,
                                dma_addr_t dma_handle)
 {
-       dma_unmap_single(dev, dma_handle, size, DMA_FROM_DEVICE);
+       struct device *dmadev = dev->bus->sysdev;
+
+       dma_unmap_single(dmadev, dma_handle, size, DMA_FROM_DEVICE);
        kfree(buffer);
 }
 
@@ -282,6 +285,7 @@ static void pwc_frame_complete(struct pwc_device *pdev)
 static void pwc_isoc_handler(struct urb *urb)
 {
        struct pwc_device *pdev = (struct pwc_device *)urb->context;
+       struct device *dmadev = urb->dev->bus->sysdev;
        int i, fst, flen;
        unsigned char *iso_buf = NULL;
 
@@ -328,7 +332,7 @@ static void pwc_isoc_handler(struct urb *urb)
        /* Reset ISOC error counter. We did get here, after all. */
        pdev->visoc_errors = 0;
 
-       dma_sync_single_for_cpu(&urb->dev->dev,
+       dma_sync_single_for_cpu(dmadev,
                                urb->transfer_dma,
                                urb->transfer_buffer_length,
                                DMA_FROM_DEVICE);
@@ -379,7 +383,7 @@ static void pwc_isoc_handler(struct urb *urb)
                pdev->vlast_packet_size = flen;
        }
 
-       dma_sync_single_for_device(&urb->dev->dev,
+       dma_sync_single_for_device(dmadev,
                                   urb->transfer_dma,
                                   urb->transfer_buffer_length,
                                   DMA_FROM_DEVICE);
@@ -461,7 +465,7 @@ retry:
                urb->pipe = usb_rcvisocpipe(udev, pdev->vendpoint);
                urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
                urb->transfer_buffer_length = ISO_BUFFER_SIZE;
-               urb->transfer_buffer = pwc_alloc_urb_buffer(&udev->dev,
+               urb->transfer_buffer = pwc_alloc_urb_buffer(udev,
                                                            urb->transfer_buffer_length,
                                                            &urb->transfer_dma);
                if (urb->transfer_buffer == NULL) {
@@ -524,7 +528,7 @@ static void pwc_iso_free(struct pwc_device *pdev)
                if (urb) {
                        PWC_DEBUG_MEMORY("Freeing URB\n");
                        if (urb->transfer_buffer)
-                               pwc_free_urb_buffer(&urb->dev->dev,
+                               pwc_free_urb_buffer(urb->dev,
                                                    urb->transfer_buffer_length,
                                                    urb->transfer_buffer,
                                                    urb->transfer_dma);