[PATCH v2 1/8] nvme-fabrics: allow to queue requests for live queues

[Christoph Hellwig]

On Fri, Aug 14, 2020 at 12:08:52AM -0700, Sagi Grimberg wrote:
>> Which will still happen with the admin queue user passthrough
>> commands with this patch, so I don't think it actually solves anything,
>> it just reduces the exposure a bit.
>
> The original version of the patch removed that as well, but james
> indicated that it's still needed because we have no way to make sure
> the admin (re)connect will be the first request when we unquiesce.

Is that whole thing really a problem?  All the pass through requests
are inserted at the head of the queue, so how could something else
slip in before it?  If we have a race window we probably need
to use BLK_MQ_REQ_PREEMPT or something like to force executing the
connect on an otherwise frozen queue.