[media] v4l: vb2-dma-contig: fail if user ptr buffer is not correctly aligned
authorMarek Szyprowski <m.szyprowski@samsung.com>
Tue, 12 Jun 2012 13:18:16 +0000 (10:18 -0300)
committerMauro Carvalho Chehab <mchehab@redhat.com>
Sun, 25 Nov 2012 19:21:32 +0000 (17:21 -0200)
commitd81e870d5afa1b0a95ea94c4052d3c7e973fae8c
treefbf9102a76c986ca9b6527570d160c905e3f9e7c
parent67a5d0cebf30020bdc4846892adf360c57610268
[media] v4l: vb2-dma-contig: fail if user ptr buffer is not correctly aligned

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