[PATCH] drm/radeon: fix radeon_fence_wait_empty_locked

[Christian König]

From: Christian K?nig <christian.koe...@amd.com>

Don't block forever if there is nothing to wait for.

Signed-off-by: Christian K?nig <christian.koenig at amd.com>
---
 drivers/gpu/drm/radeon/radeon_fence.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_fence.c 
b/drivers/gpu/drm/radeon/radeon_fence.c
index b8f68b2..281d14c 100644
--- a/drivers/gpu/drm/radeon/radeon_fence.c
+++ b/drivers/gpu/drm/radeon/radeon_fence.c
@@ -510,6 +510,9 @@ int radeon_fence_wait_empty_locked(struct radeon_device 
*rdev, int ring)
        int r;

        seq[ring] = rdev->fence_drv[ring].sync_seq[ring];
+       if (!seq[ring])
+               return 0;
+
        r = radeon_fence_wait_seq(rdev, seq, false, false);
        if (r) {
                if (r == -EDEADLK)
-- 
1.8.1.2