diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index 08e1578f55f83a4b960df0b6ef37fa822082b383..407d90aaa0c361a524eabac96cb62d51e40f1c5b 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -346,7 +346,9 @@ int radeon_ring_alloc(struct radeon_device *rdev, struct radeon_ring *ring, unsi
 		if (ndw < ring->ring_free_dw) {
 			break;
 		}
+		mutex_unlock(&ring->mutex);
 		r = radeon_fence_wait_next(rdev, radeon_ring_index(rdev, ring));
+		mutex_lock(&ring->mutex);
 		if (r)
 			return r;
 	}