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@xxxxxxxxxxxxxxx/msg37086.html. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> --- drivers/media/video/cx231xx/cx231xx-audio.c | 4 ++-- drivers/media/video/cx231xx/cx231xx-core.c | 4 ++-- 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 30d13c1..e0b2d5c 100644 --- a/drivers/media/video/cx231xx/cx231xx-audio.c +++ b/drivers/media/video/cx231xx/cx231xx-audio.c @@ -298,7 +298,7 @@ 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; @@ -356,7 +356,7 @@ 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 d4457f9..d4527f2 100644 --- a/drivers/media/video/cx231xx/cx231xx-core.c +++ b/drivers/media/video/cx231xx/cx231xx-core.c @@ -1071,7 +1071,7 @@ 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++) { @@ -1182,7 +1182,7 @@ 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 1c7a4da..852878d 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); -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
