[PATCH v2 2/3] media/videobuf2-dma-contig: Save output from dma_map_sg

Ricardo Ribalda Delgado
2015-02-11T10:34:30Z

dma_map_sg returns the number of areas mapped by the hardware,
which could be different than the areas given as an input.
The output must be saved to nent.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
---
drivers/media/v4l2-core/videobuf2-dma-contig.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c
index b481d20..bfb5917 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
@@ -299,7 +299,6 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
/* stealing dmabuf mutex to serialize map/unmap operations */
struct mutex *lock = &db_attach->dmabuf->lock;
struct sg_table *sgt;
- int ret;

mutex_lock(lock);

@@ -318,8 +317,9 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
}

/* mapping to the client with new direction */
- ret = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, dma_dir);
- if (ret <= 0) {
+ sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
+ dma_dir);
+ if (!sgt->nents) {
pr_err("failed to map scatterlist\n");
mutex_unlock(lock);
return ERR_PTR(-EIO);
--
2.1.4