dma_fence_get_rcu
if (!fence || !dma_fence_get_rcu(fence)) {
return to_request(dma_fence_get_rcu(&rq->fence));
if (fence_excl && !dma_fence_get_rcu(fence_excl))
if (!dma_fence_get_rcu(shared[i]))
if (!dma_fence_get_rcu(fence))
if (!dma_fence_get_rcu(lfence))
fence = dma_fence_get_rcu(lfence);