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dma-buf: Remove obsoleted internal lock

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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.

Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221017172229.42269-22-dmitry.osipenko@collabora.com
This commit is contained in:
Dmitry Osipenko 2022-10-17 20:22:29 +03:00
parent 23543b3c4f
commit 28743e25fa
2 changed files with 4 additions and 19 deletions
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14
drivers/dma-buf/dma-buf.c
View File

@ -657,7 +657,6 @@ 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, 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);
@ -1583,13 +1579,11 @@ 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);

9
include/linux/dma-buf.h
View File

@ -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:
*