From: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
(This time with correct stable address.)
The last argument of vb2_dc_get_user_pages() is of type enum
dma_data_direction, but the caller, vb2_dc_get_userptr() passes a value
which is the result of comparison dma_dir == DMA_FROM_DEVICE. This results
in the write parameter to get_user_pages() being zero in all cases, i.e.
that the caller has no intent to write there.
This was broken by patch "vb2: replace 'write' by 'dma_dir'".
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Fixes: cd474037c4a9 ("[media] vb2: replace 'write' by 'dma_dir'")
---
Hi,
This fixes videobuf2 dma-contig memory type USERPTR support for v3.19. The
pull req for the patch was submitted some time ago:
<URL:http://www.spinics.net/lists/linux-media/msg86425.html>
Mauro, let us know if you have objections.
Thanks.
drivers/media/v4l2-core/videobuf2-dma-contig.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c
index b481d20..69e0483 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
@@ -632,8 +632,7 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr,
}
/* extract page list from userspace mapping */
- ret = vb2_dc_get_user_pages(start, pages, n_pages, vma,
- dma_dir == DMA_FROM_DEVICE);
+ ret = vb2_dc_get_user_pages(start, pages, n_pages, vma, dma_dir);
if (ret) {
unsigned long pfn;
if (vb2_dc_get_user_pfn(start, n_pages, vma, &pfn) == 0) {
--
1.7.10.4
--
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