| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 31/76] [media] media: vb2 dma-contig: Fully cache synchronise buffers in prepare and finish | Date | Sun, 14 Feb 2016 14:22:58 -0800 |
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3.14-stable review patch. If anyone has any objections, please let me know.
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From: Tiffany Lin <tiffany.lin@mediatek.com>
commit d9a985883fa32453d099d6293188c11d75cef1fa upstream.
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: 199d101efdba ("v4l: vb2-dma-contig: add prepare/finish to dma-contig allocator")
Signed-off-by: Tiffany Lin <tiffany.lin@mediatek.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/media/v4l2-core/videobuf2-dma-contig.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c @@ -117,7 +117,8 @@ static void vb2_dc_prepare(void *buf_pri 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) @@ -129,7 +130,7 @@ 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); } /*********************************************/
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