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dma-buf/fence: revert "don't wait when specified timeout is zero" (v2)

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Reverts commit 847b19a39e
	("dma-buf/fence: don't wait when specified timeout is zero")

When we don't call the wait function software signaling might never be
activated. This can cause infinite polling loops with unreliable interrupt
driven hardware.

v2: rebase on drm-next

Reviewed-by: Alex Deucher <[email protected]>
Signed-off-by: Christian König <[email protected]>
Reviewed-by: Chunming Zhou <[email protected]>
Reviewed-by: Gustavo Padovan <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Signed-off-by: Sumit Semwal <[email protected]>
  [sumits: reword commit msg for checkpatch warnings]
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
This commit is contained in:
Alex Deucher 2016-11-07 16:16:14 -05:00 • committed by Sumit Semwal
commit 698c0f7ff2
1 changed files with 0 additions and 3 deletions
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3
drivers/dma-buf/dma-fence.c
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@ -161,9 +161,6 @@ dma_fence_wait_timeout(struct dma_fence *fence, bool intr, signed long timeout)
if (WARN_ON(timeout < 0))
return -EINVAL;
if (timeout == 0)
return dma_fence_is_signaled(fence);
trace_dma_fence_wait_start(fence);
ret = fence->ops->wait(fence, intr, timeout);
trace_dma_fence_wait_end(fence);