diff options
| author | Muralidharan Karicheri <m-karicheri2@ti.com> | 2009-12-10 16:47:48 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-12-16 00:18:34 -0200 |
| commit | 31bedfa5068936b15a388842be1d03cdd1bdfb07 (patch) | |
| tree | d02d9204a0ed1fe2a9eca8b7f2d1553b1d85d5a3 /drivers/media/video/videobuf-dma-contig.c | |
| parent | 0d94e29459d372b6c5dda964a8b35a8d40050ca7 (diff) | |
V4L/DVB (13598): videobuf_dma_contig_user_get() for non-aligned offsets
If a USERPTR address that is not aligned to page boundary is passed to the
videobuf_dma_contig_user_get() function, it saves a page aligned address to
the dma_handle. This is not correct. This issue is observed when using USERPTR
IO machism for buffer exchange.
Updates from last version:-
Adding offset for size calculation as per comment from Magnus Damm. This
ensures the last page is also included for checking if memory is
contiguous.
Signed-off-by: Muralidharan Karicheri <m-karicheri2@ti.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/videobuf-dma-contig.c')
| -rw-r--r-- | drivers/media/video/videobuf-dma-contig.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/media/video/videobuf-dma-contig.c b/drivers/media/video/videobuf-dma-contig.c index d25f28461da..22c01097e8a 100644 --- a/drivers/media/video/videobuf-dma-contig.c +++ b/drivers/media/video/videobuf-dma-contig.c @@ -141,9 +141,11 @@ static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, struct vm_area_struct *vma; unsigned long prev_pfn, this_pfn; unsigned long pages_done, user_address; + unsigned int offset; int ret; - mem->size = PAGE_ALIGN(vb->size); + offset = vb->baddr & ~PAGE_MASK; + mem->size = PAGE_ALIGN(vb->size + offset); mem->is_userptr = 0; ret = -EINVAL; @@ -166,7 +168,7 @@ static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, break; if (pages_done == 0) - mem->dma_handle = this_pfn << PAGE_SHIFT; + mem->dma_handle = (this_pfn << PAGE_SHIFT) + offset; else if (this_pfn != (prev_pfn + 1)) ret = -EFAULT; |