[PATCH WIP/RFC v3 3/6] nvme_rdma: keep a ref on the ctrl during delete/flush

[Christoph Hellwig]

On Tue, Aug 30, 2016 at 08:24:50PM +0300, Sagi Grimberg wrote:
>
>> -	/* Queue controller deletion */
>> +	/*
>> +	 * Queue controller deletion. Keep a reference until all
>> +	 * work is flushed since delete_work will free the ctrl mem
>> +	 */
>> +	kref_get(&ctrl->ctrl.kref);
>
> kref_get_unless_zero?

How could the refcount be zero here?