drm/radeon: fix radeon_fence_wait_empty_locked

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

Signed-off-by: Christian König <christian.koenig@amd.com>
Tested-by: Rafa? Mi?ecki <zajec5@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c
index b8f68b2c47d4..281d14c22a47 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)