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| author | Jason Wang <jason77.wang@gmail.com> | 2010-09-03 06:57:19 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-09-27 22:21:51 -0300 |
| commit | 882787ff8fdeb0be790547ee9b22b281095e95da (patch) | |
| tree | 52006253aed2ce45148719cce487a22dce878665 /drivers/media | |
| parent | 29d834912bbcf0d095e6cd0e95b0d9790fdf7957 (diff) | |
| download | linux-3.10-882787ff8fdeb0be790547ee9b22b281095e95da.tar.gz linux-3.10-882787ff8fdeb0be790547ee9b22b281095e95da.tar.bz2 linux-3.10-882787ff8fdeb0be790547ee9b22b281095e95da.zip | |
V4L/DVB: gspca - main: Fix a crash of some webcams on ARM arch
When plugging some webcams on ARM, the system crashes.
This is because we alloc buffer for an urb through usb_buffer_alloc,
the alloced buffer is already in DMA coherent region, so we should
set the flag of this urb to URB_NO_TRANSFER_DMA_MAP, otherwise when
we submit this urb, the hcd core will handle this address as an
non-DMA address and call dma_map_single/sg to map it. On arm
architecture, dma_map_single a DMA coherent address will be catched
by a BUG_ON().
Signed-off-by: Jason Wang <jason77.wang@gmail.com>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Cc: stable@kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/video/gspca/gspca.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c index b9846106913..78abc1c1f9d 100644 --- a/drivers/media/video/gspca/gspca.c +++ b/drivers/media/video/gspca/gspca.c @@ -223,6 +223,7 @@ static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev, usb_rcvintpipe(dev, ep->bEndpointAddress), buffer, buffer_len, int_irq, (void *)gspca_dev, interval); + urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; gspca_dev->int_urb = urb; ret = usb_submit_urb(urb, GFP_KERNEL); if (ret < 0) { |