amdgpu_sync_peek_fence
dep = amdgpu_sync_peek_fence(&isolation->prev, ring);
fences[i] = amdgpu_sync_peek_fence(&(*idle)->active, r);
tmp = amdgpu_sync_peek_fence(&(*id)->active, ring);
struct dma_fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync,