diff options
| author |   Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2012-01-07 09:52:37 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-01-10 22:38:59 -0200 |
| commit | 7a6f6c29d264cdd2fe0eb3d923217eed5f0ad134 (patch) | |
| tree | fc2044a0b5f6300cafbae08285c84e8f9bc55fee | |
| parent | [media] cx231xx: simplify argument passing to cx231xx_init_dev() (diff) | |
| download | linux-dev-7a6f6c29d264cdd2fe0eb3d923217eed5f0ad134.tar.xz linux-dev-7a6f6c29d264cdd2fe0eb3d923217eed5f0ad134.zip | |
[media] cx231xx: use URB_NO_TRANSFER_DMA_MAP on URBs allocated with usb_alloc_urb()
URBs allocated with usb_alloc_urb() are allocated from DMA-coherent
areas, and therefore it is not necessary to call dma_map_single() on
such buffers. Worst, on ARM, calling dma_map_single() on a
DMA-coherent buffer will trigger a BUG_ON() in
arch/arm/mm/dma-mapping.c.
Therefore, we mark all URBs allocated with usb_alloc_urb() with the
URB_NO_TRANSFER_DMA_MAP transfer_flags, so that the USB core does not
do dma_map_single()/dma_unmap_single() on those buffers.
This is similar to 882787ff8fdeb0be790547ee9b22b281095e95da for the
gspca driver, and has already been discussed on the linux-media list
in the past:
http://www.mail-archive.com/linux-media@vger.kernel.org/msg37086.html.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/video/cx231xx/cx231xx-audio.c | 4 | ||||
| -rw-r--r-- | drivers/media/video/cx231xx/cx231xx-core.c | 4 | ||||
| -rw-r--r-- | drivers/media/video/cx231xx/cx231xx-vbi.c | 2 |
3 files changed, 5 insertions, 5 deletions
diff --git a/drivers/media/video/cx231xx/cx231xx-audio.c b/drivers/media/video/cx231xx/cx231xx-audio.c index e5742a0e19a0..a2c2b7d343ec 100644 --- a/drivers/media/video/cx231xx/cx231xx-audio.c +++ b/drivers/media/video/cx231xx/cx231xx-audio.c @@ -307,7 +307,7 @@ static int cx231xx_init_audio_isoc(struct cx231xx *dev) urb->context = dev; urb->pipe = usb_rcvisocpipe(dev->udev, dev->adev.end_point_addr); - urb->transfer_flags = URB_ISO_ASAP; + urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; urb->transfer_buffer = dev->adev.transfer_buffer[i]; urb->interval = 1; urb->complete = cx231xx_audio_isocirq; @@ -368,7 +368,7 @@ static int cx231xx_init_audio_bulk(struct cx231xx *dev) urb->context = dev; urb->pipe = usb_rcvbulkpipe(dev->udev, dev->adev.end_point_addr); - urb->transfer_flags = 0; + urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; urb->transfer_buffer = dev->adev.transfer_buffer[i]; urb->complete = cx231xx_audio_bulkirq; urb->transfer_buffer_length = sb_size; diff --git a/drivers/media/video/cx231xx/cx231xx-core.c b/drivers/media/video/cx231xx/cx231xx-core.c index 39e9878cb38f..08dd930f882a 100644 --- a/drivers/media/video/cx231xx/cx231xx-core.c +++ b/drivers/media/video/cx231xx/cx231xx-core.c @@ -1074,7 +1074,7 @@ int cx231xx_init_isoc(struct cx231xx *dev, int max_packets, sb_size, cx231xx_isoc_irq_callback, dma_q, 1); urb->number_of_packets = max_packets; - urb->transfer_flags = URB_ISO_ASAP; + urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; k = 0; for (j = 0; j < max_packets; j++) { @@ -1185,7 +1185,7 @@ int cx231xx_init_bulk(struct cx231xx *dev, int max_packets, return -ENOMEM; } dev->video_mode.bulk_ctl.urb[i] = urb; - urb->transfer_flags = 0; + urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; dev->video_mode.bulk_ctl.transfer_buffer[i] = usb_alloc_coherent(dev->udev, sb_size, GFP_KERNEL, diff --git a/drivers/media/video/cx231xx/cx231xx-vbi.c b/drivers/media/video/cx231xx/cx231xx-vbi.c index 9c5967e1d0c6..8cdee5f78f13 100644 --- a/drivers/media/video/cx231xx/cx231xx-vbi.c +++ b/drivers/media/video/cx231xx/cx231xx-vbi.c @@ -452,7 +452,7 @@ int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets, return -ENOMEM; } dev->vbi_mode.bulk_ctl.urb[i] = urb; - urb->transfer_flags = 0; + urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; dev->vbi_mode.bulk_ctl.transfer_buffer[i] = kzalloc(sb_size, GFP_KERNEL); |