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BACKPORT: 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 <alexander.deucher@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
  [sumits: reword commit msg for checkpatch warnings]
Link: http://patchwork.freedesktop.org/patch/msgid/1478553376-18575-2-git-send-email-alexander.deucher@amd.com
(cherry picked from commit 698c0f7ff2)
Signed-off-by: Marissa Wall <marissaw@google.com>

Change-Id: I6a0d72034ecec3832c90864291bc5674da8a0b5d
This commit is contained in:
Alex Deucher
2016-11-07 16:16:14 -05:00
committed by Marissa Wall
parent a283774951
commit 4b85bcea3c
1 changed files with 0 additions and 3 deletions
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3
drivers/dma-buf/fence.c
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@@ -161,9 +161,6 @@ 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);