[git:media_tree/fixes] [media] vb2: Fix dma_dir setting for dma-contig mem type

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Subject: [media] vb2: Fix dma_dir setting for dma-contig mem type
Author:  Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Date:    Fri Feb 13 04:42:37 2015 -0300

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  # for v3.19
Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>

 drivers/media/v4l2-core/videobuf2-dma-contig.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

---

http://git.linuxtv.org/cgit.cgi/media_tree.git/commit/?id=4879785ed511083676f27a016c9ad6c46c8e5737

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) {
--
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