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dma-fence: add comment for WARN_ON in dma_fence_release()

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In dma_fence_release() there is a WARN_ON which could be triggered by
several cases of wrong dma-fence usage. This patch adds a comment to
explain two use-cases to help driver developers that use dma-fence
and trigger that WARN_ON to better understand the reasons for it.

v2: change to a more generic, one-liner comment

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Oded Gabbay 2018-01-29 17:31:40 +02:00
parent 128ccceaba
commit 4518cd28d8
1 changed files with 1 additions and 0 deletions
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drivers/dma-buf/dma-fence.c
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@ -171,6 +171,7 @@ void dma_fence_release(struct kref *kref)
trace_dma_fence_destroy(fence);
/* Failed to signal before release, could be a refcounting issue */
WARN_ON(!list_empty(&fence->cb_list));
if (fence->ops->release)