linux-kernel - Re: [PATCH] NVMe: do not touch sq door bell if nvmeq has been suspended

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Message-ID: <20160203163808.GC23910@localhost.localdomain>
Date:	Wed, 3 Feb 2016 16:38:09 +0000
From:	Keith Busch <keith.busch@...el.com>
To:	Wenbo Wang <wenbo.wang@...blaze.com>
Cc:	Jens Axboe <axboe@...com>, Wenbo Wang <mail_weber_wang@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
	"Wenwei.Tao" <wenwei.tao@...blaze.com>
Subject: Re: [PATCH] NVMe: do not touch sq door bell if nvmeq has been
 suspended

On Wed, Feb 03, 2016 at 04:35:03PM +0000, Wenbo Wang wrote:
> For async io (executed by run_work worker) it should work. However for sync io in blk_mq_run_hw_queue, this seems not help, there is still a window.

Alright, for lack of a better way to sync a stopped queue, the driver's
indication looks like the best we can do at this point.