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[media] cx231xx: don't DMA to random addresses 

Commit 7a6f6c29d2 (cx231xx: use
URB_NO_TRANSFER_DMA_MAP) was intended to avoid mapping the DMA buffer
for URB twice. This works for the URBs allocated with usb_alloc_urb(),
as those are allocated from cohernent DMA pools, but the flag was also
added for the VBI and audio URBs, which have a manually allocated area.
This leaves the random trash in the structure after allocation as the
DMA address, corrupting memory and preventing VBI and audio from
working. Letting the USB core map the buffers solves the problem.

Cc: stable@kernel.org
Signed-off-by: David Dillow <dave@thedillows.org>
Cc: Sri Deevi <srinivasa.deevi@conexant.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
David Dillow 2012-06-18 00:15:21 -03:00 committed by Mauro Carvalho Chehab
parent 4dab0e5fe8
commit a7deca6fa7
2 changed files with 3 additions and 3 deletions
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4
drivers/media/video/cx231xx/cx231xx-audio.c
View File

@ -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_NO_TRANSFER_DMA_MAP;
urb->transfer_flags = URB_ISO_ASAP;
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 = URB_NO_TRANSFER_DMA_MAP;
urb->transfer_flags = 0;
urb->transfer_buffer = dev->adev.transfer_buffer[i];
urb->complete = cx231xx_audio_bulkirq;
urb->transfer_buffer_length = sb_size;

2
drivers/media/video/cx231xx/cx231xx-vbi.c
View File

@ -448,7 +448,7 @@ int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
return -ENOMEM;
}
dev->vbi_mode.bulk_ctl.urb[i] = urb;
urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
urb->transfer_flags = 0;
dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
kzalloc(sb_size, GFP_KERNEL);