dma_fence_get_rcu
if (!fence || !dma_fence_get_rcu(fence)) {
cursor->fence = dma_fence_get_rcu(cursor->fence);
return to_request(dma_fence_get_rcu(&rq->fence));
fence = dma_fence_get_rcu(&node->unbind_fence);
struct dma_fence *dma_fence_get_rcu(struct dma_fence *);
f = dma_fence_get_rcu(&s_fence->finished);