This does not hold at least for NVMe RDMA host driver. An example scenario is when the RDMA connection is gone while the controller is being deleted. In this case, the nvmf_reg_write32() for sending shutdown admin command by the delete_work could be hung forever if the command is not completed by the timeout handler.
If the queue is gone, this means that the queue has already flushed and any commands that were inflight has completed with a flush error completion... Can you describe the scenario that caused this hang? When has the queue became "gone" and when did the shutdown command execute?
