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Subject[RFC][PATCH 14/15] videobuf2: don't test db_attach in dma-contig prepare and finish
Date
We moved cache management decision making to the upper layer and
rely on buffer's need_cache_sync flags and videobuf2 core. If the
upper layer (core) has decided to invoke ->prepare() or ->finish()
then we must sync.

For DMABUF ->need_cache_sync_on_prepare and ->need_cache_sync_on_flush
are always false so videobuf core does not call ->prepare() and
->finish() on such buffers.

Additionally, scratch the DMABUF comment.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
drivers/media/common/videobuf2/videobuf2-dma-contig.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
index a387260fb321..6ea0961149d7 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
@@ -100,8 +100,7 @@ static void vb2_dc_prepare(void *buf_priv)
struct vb2_dc_buf *buf = buf_priv;
struct sg_table *sgt = buf->dma_sgt;

- /* DMABUF exporter will flush the cache for us */
- if (!sgt || buf->db_attach)
+ if (!sgt)
return;

dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents,
@@ -113,8 +112,7 @@ static void vb2_dc_finish(void *buf_priv)
struct vb2_dc_buf *buf = buf_priv;
struct sg_table *sgt = buf->dma_sgt;

- /* DMABUF exporter will flush the cache for us */
- if (!sgt || buf->db_attach)
+ if (!sgt)
return;

dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir);
--
2.24.1.735.g03f4e72817-goog
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