Am 21.01.2015 um 11:35 schrieb Jammy Zhou:
When specified timeout is zero for fence_wait_timeout, just check if the fence
is signaled or not without wait.
Signed-off-by: Jammy Zhou <Jammy.Zhou@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/dma-buf/fence.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/dma-buf/fence.c b/drivers/dma-buf/fence.c
index e554111..50ef8bd 100644
--- a/drivers/dma-buf/fence.c
+++ b/drivers/dma-buf/fence.c
@@ -159,6 +159,9 @@ fence_wait_timeout(struct fence *fence, bool intr, signed long timeout)
if (WARN_ON(timeout < 0))
return -EINVAL;
+ if (timeout == 0)
+ return fence_is_signaled(fence);
+
trace_fence_wait_start(fence);
ret = fence->ops->wait(fence, intr, timeout);
trace_fence_wait_end(fence);
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