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dma-buf: return only unsignaled fences in dma_fence_unwrap_for_each v3

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dma_fence_chain containers cleanup signaled fences automatically, so
filter those out from arrays as well.

v2: fix missing walk over the array
v3: massively simplify the patch and actually update the description.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220518135844.3338-4-christian.koenig@amd.com
This commit is contained in:
Christian König 2022-05-04 13:01:29 +02:00
parent 01357a5a45
commit 8f61973718
1 changed files with 5 additions and 1 deletions
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6
include/linux/dma-fence-unwrap.h
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@ -43,9 +43,13 @@ struct dma_fence *dma_fence_unwrap_next(struct dma_fence_unwrap *cursor);
* Unwrap dma_fence_chain and dma_fence_array containers and deep dive into all
* potential fences in them. If @head is just a normal fence only that one is
* returned.
*
* Note that signalled fences are opportunistically filtered out, which
* means the iteration is potentially over no fence at all.
*/
#define dma_fence_unwrap_for_each(fence, cursor, head) \
for (fence = dma_fence_unwrap_first(head, cursor); fence; \
fence = dma_fence_unwrap_next(cursor))
fence = dma_fence_unwrap_next(cursor)) \
if (!dma_fence_is_signaled(fence))
#endif