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[media] media: vb2 dma-contig: Fully cache synchronise buffers in prepare and finish

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In videobuf2 dma-contig memory type the prepare and finish ops, instead of
passing the number of entries in the original scatterlist as the "nents"
parameter to dma_sync_sg_for_device() and dma_sync_sg_for_cpu(), the value
returned by dma_map_sg() was used. Albeit this has been suggested in
comments of some implementations (which have since been corrected), this
is wrong.

Fixes: 199d101efd ("v4l: vb2-dma-contig: add prepare/finish to dma-contig allocator")

Cc: [email protected] # for v3.8 and up
Signed-off-by: Tiffany Lin <[email protected]>
Signed-off-by: Sakari Ailus <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Tiffany Lin 2015-09-24 06:02:36 -03:00 • committed by Mauro Carvalho Chehab
commit d9a985883f
1 changed files with 3 additions and 2 deletions
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5
drivers/media/v4l2-core/videobuf2-dma-contig.c
View file

@ -100,7 +100,8 @@ static void vb2_dc_prepare(void *buf_priv)
if (!sgt || buf->db_attach)
return;
dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents,
buf->dma_dir);
}
static void vb2_dc_finish(void *buf_priv)
@ -112,7 +113,7 @@ static void vb2_dc_finish(void *buf_priv)
if (!sgt || buf->db_attach)
return;
dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir);
}
/*********************************************/