Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Fri, 2 Feb 2018 11:24:13 -0700
From:   Keith Busch <keith.busch@intel.com>
To:     Jianchao Wang <jianchao.w.wang@oracle.com>
Cc:     axboe@fb.com, hch@lst.de, sagi@grimberg.me,
        linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/6] nvme-pci: fix the freeze and quiesce for shutdown
 and reset case
Message-ID: <20180202182413.GH24417@localhost.localdomain>
References: <1517554849-7802-1-git-send-email-jianchao.w.wang@oracle.com>
 <1517554849-7802-3-git-send-email-jianchao.w.wang@oracle.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1517554849-7802-3-git-send-email-jianchao.w.wang@oracle.com>
User-Agent: Mutt/1.9.1 (2017-09-22)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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.