Re: [PATCH v4 20/21] media: videobuf2: Stop using internal dma-buf lock

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Am 31.08.22 um 17:37 schrieb Dmitry Osipenko:
All drivers that use dma-bufs have been moved to the updated locking
specification and now dma-buf reservation is guaranteed to be locked
by importers during the mapping operations. There is no need to take
the internal dma-buf lock anymore. Remove locking from the videobuf2
memory allocators.

Acked-by: Tomasz Figa <tfiga@xxxxxxxxxxxx>
Acked-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>

Acked-by: Christian König <christian.koenig@xxxxxxx>

---
  drivers/media/common/videobuf2/videobuf2-dma-contig.c | 11 +----------
  drivers/media/common/videobuf2/videobuf2-dma-sg.c     | 11 +----------
  drivers/media/common/videobuf2/videobuf2-vmalloc.c    | 11 +----------
  3 files changed, 3 insertions(+), 30 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
index 79f4d8301fbb..555bd40fa472 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
@@ -382,18 +382,12 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
  	struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir)
  {
  	struct vb2_dc_attachment *attach = db_attach->priv;
-	/* stealing dmabuf mutex to serialize map/unmap operations */
-	struct mutex *lock = &db_attach->dmabuf->lock;
  	struct sg_table *sgt;
- mutex_lock(lock);
-
  	sgt = &attach->sgt;
  	/* return previously mapped sg table */
-	if (attach->dma_dir == dma_dir) {
-		mutex_unlock(lock);
+	if (attach->dma_dir == dma_dir)
  		return sgt;
-	}
/* release any previous cache */
  	if (attach->dma_dir != DMA_NONE) {
@@ -409,14 +403,11 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
  	if (dma_map_sgtable(db_attach->dev, sgt, dma_dir,
  			    DMA_ATTR_SKIP_CPU_SYNC)) {
  		pr_err("failed to map scatterlist\n");
-		mutex_unlock(lock);
  		return ERR_PTR(-EIO);
  	}
attach->dma_dir = dma_dir; - mutex_unlock(lock);
-
  	return sgt;
  }
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
index 36ecdea8d707..36981a5b5c53 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
@@ -424,18 +424,12 @@ static struct sg_table *vb2_dma_sg_dmabuf_ops_map(
  	struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir)
  {
  	struct vb2_dma_sg_attachment *attach = db_attach->priv;
-	/* stealing dmabuf mutex to serialize map/unmap operations */
-	struct mutex *lock = &db_attach->dmabuf->lock;
  	struct sg_table *sgt;
- mutex_lock(lock);
-
  	sgt = &attach->sgt;
  	/* return previously mapped sg table */
-	if (attach->dma_dir == dma_dir) {
-		mutex_unlock(lock);
+	if (attach->dma_dir == dma_dir)
  		return sgt;
-	}
/* release any previous cache */
  	if (attach->dma_dir != DMA_NONE) {
@@ -446,14 +440,11 @@ static struct sg_table *vb2_dma_sg_dmabuf_ops_map(
  	/* mapping to the client with new direction */
  	if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, 0)) {
  		pr_err("failed to map scatterlist\n");
-		mutex_unlock(lock);
  		return ERR_PTR(-EIO);
  	}
attach->dma_dir = dma_dir; - mutex_unlock(lock);
-
  	return sgt;
  }
diff --git a/drivers/media/common/videobuf2/videobuf2-vmalloc.c b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
index 7831bf545874..41db707e43a4 100644
--- a/drivers/media/common/videobuf2/videobuf2-vmalloc.c
+++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
@@ -267,18 +267,12 @@ static struct sg_table *vb2_vmalloc_dmabuf_ops_map(
  	struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir)
  {
  	struct vb2_vmalloc_attachment *attach = db_attach->priv;
-	/* stealing dmabuf mutex to serialize map/unmap operations */
-	struct mutex *lock = &db_attach->dmabuf->lock;
  	struct sg_table *sgt;
- mutex_lock(lock);
-
  	sgt = &attach->sgt;
  	/* return previously mapped sg table */
-	if (attach->dma_dir == dma_dir) {
-		mutex_unlock(lock);
+	if (attach->dma_dir == dma_dir)
  		return sgt;
-	}
/* release any previous cache */
  	if (attach->dma_dir != DMA_NONE) {
@@ -289,14 +283,11 @@ static struct sg_table *vb2_vmalloc_dmabuf_ops_map(
  	/* mapping to the client with new direction */
  	if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, 0)) {
  		pr_err("failed to map scatterlist\n");
-		mutex_unlock(lock);
  		return ERR_PTR(-EIO);
  	}
attach->dma_dir = dma_dir; - mutex_unlock(lock);
-
  	return sgt;
  }




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