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authorChristian König <christian.koenig@amd.com>2022-05-04 13:01:29 +0200
committerChristian König <christian.koenig@amd.com>2022-05-30 14:23:21 +0200
commit8f61973718485f3e89bc4f408f929048b7b47c83 (patch)
tree0482066134e33262f44efd3d89ff9b21b9ecc652 /include/linux/dma-fence-unwrap.h
parent01357a5a45ed8eb9543183f5c9c6713ae60fc1f3 (diff)
dma-buf: return only unsignaled fences in dma_fence_unwrap_for_each v3
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
Diffstat (limited to 'include/linux/dma-fence-unwrap.h')
-rw-r--r--include/linux/dma-fence-unwrap.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/dma-fence-unwrap.h b/include/linux/dma-fence-unwrap.h
index e7c219da4ed7..a4d342fef8e0 100644
--- a/include/linux/dma-fence-unwrap.h
+++ b/include/linux/dma-fence-unwrap.h
@@ -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