linux-kernel - Re: [PATCH 2/6] nvme-pci: fix the freeze and quiesce for shutdown and reset case

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Date:   Fri, 2 Feb 2018 11:24:13 -0700
From:   Keith Busch <keith.busch@...el.com>
To:     Jianchao Wang <jianchao.w.wang@...cle.com>
Cc:     axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] nvme-pci: fix the freeze and quiesce for shutdown
 and reset case

On Fri, Feb 02, 2018 at 03:00:45PM +0800, Jianchao Wang wrote:
> Currently, request queue will be frozen and quiesced for both reset
> and shutdown case. This will trigger ioq requests in RECONNECTING
> state which should be avoided to prepare for following patch.
> Just freeze request queue for shutdown case and drain all the resudual
> entered requests after controller has been shutdown.

Freezing is not just for shutdown. It's also used so
blk_mq_update_nr_hw_queues will work if the queue count changes across
resets.