[media] v4l: vb2-dma-contig: fail if user ptr buffer is not correctly aligned

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The DMA transfer must be aligned to a specific value. If userptr is not aligned
to DMA requirements then unexpected corruptions of the memory may occur before
or after a buffer.  To prevent such situations, all unligned userptr buffers
are rejected at VIDIOC_QBUF.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

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Marek Szyprowski 2012-06-12 10:18:16 -03:00 • committed by Mauro Carvalho Chehab

parent 67a5d0cebf

commit d81e870d5a

1 changed files with 12 additions and 0 deletions

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drivers/media/v4l2-core/videobuf2-dma-contig.c

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