[PATCH 2/4] dma-buf/fence: revert "don't wait when specified timeout is zero" (v2)

[Alex Deucher]

This reverts commit 847b19a39e4c9b5e74c40f0842c48b41664cb43c.

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 at amd.com>
Signed-off-by: Christian König <christian.koenig at amd.com>
Reviewed-by: Chunming Zhou <david1.zhou at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/dma-buf/dma-fence.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index 6c3f6b4..dd00990 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -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);
-- 
2.5.5