@@ -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;
}
@@ -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;
}
@@ -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;
}
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. Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> --- 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(-)