The internal dma-buf lock isn't needed anymore because the updated locking specification claims that dma-buf reservation must be locked by importers, and thus, the internal data is already protected by the reservation lock. Remove the obsoleted internal lock.
Signed-off-by: Dmitry Osipenko dmitry.osipenko@collabora.com --- drivers/dma-buf/dma-buf.c | 14 ++++---------- include/linux/dma-buf.h | 9 --------- 2 files changed, 4 insertions(+), 19 deletions(-)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 696d132b02f4..a0406254f0ae 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -656,7 +656,6 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
dmabuf->file = file;
- mutex_init(&dmabuf->lock); INIT_LIST_HEAD(&dmabuf->attachments);
mutex_lock(&db_list.lock); @@ -1503,7 +1502,7 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_mmap_unlocked, DMA_BUF); int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map) { struct iosys_map ptr; - int ret = 0; + int ret;
iosys_map_clear(map);
@@ -1515,28 +1514,25 @@ int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map) if (!dmabuf->ops->vmap) return -EINVAL;
- mutex_lock(&dmabuf->lock); if (dmabuf->vmapping_counter) { dmabuf->vmapping_counter++; BUG_ON(iosys_map_is_null(&dmabuf->vmap_ptr)); *map = dmabuf->vmap_ptr; - goto out_unlock; + return 0; }
BUG_ON(iosys_map_is_set(&dmabuf->vmap_ptr));
ret = dmabuf->ops->vmap(dmabuf, &ptr); if (WARN_ON_ONCE(ret)) - goto out_unlock; + return ret;
dmabuf->vmap_ptr = ptr; dmabuf->vmapping_counter = 1;
*map = dmabuf->vmap_ptr;
-out_unlock: - mutex_unlock(&dmabuf->lock); - return ret; + return 0; } EXPORT_SYMBOL_NS_GPL(dma_buf_vmap, DMA_BUF);
@@ -1578,13 +1574,11 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct iosys_map *map) BUG_ON(dmabuf->vmapping_counter == 0); BUG_ON(!iosys_map_is_equal(&dmabuf->vmap_ptr, map));
- mutex_lock(&dmabuf->lock); if (--dmabuf->vmapping_counter == 0) { if (dmabuf->ops->vunmap) dmabuf->ops->vunmap(dmabuf, map); iosys_map_clear(&dmabuf->vmap_ptr); } - mutex_unlock(&dmabuf->lock); } EXPORT_SYMBOL_NS_GPL(dma_buf_vunmap, DMA_BUF);
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index d48d534dc55c..aed6695bbb50 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -326,15 +326,6 @@ struct dma_buf { /** @ops: dma_buf_ops associated with this buffer object. */ const struct dma_buf_ops *ops;
- /** - * @lock: - * - * Used internally to serialize list manipulation, attach/detach and - * vmap/unmap. Note that in many cases this is superseeded by - * dma_resv_lock() on @resv. - */ - struct mutex lock; - /** * @vmapping_counter: *