From: "tj@kernel.org" <tj@kernel.org>
To: Ming Lei <ming.lei@redhat.com>
Cc: Bart Van Assche <Bart.VanAssche@wdc.com>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"israelr@mellanox.com" <israelr@mellanox.com>,
"sagi@grimberg.me" <sagi@grimberg.me>, "hch@lst.de" <hch@lst.de>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
"axboe@kernel.dk" <axboe@kernel.dk>,
"maxg@mellanox.com" <maxg@mellanox.com>
Subject: Re: [PATCH v4] blk-mq: Fix race conditions in request timeout handling
Date: Tue, 10 Apr 2018 08:40:43 -0700 [thread overview]
Message-ID: <20180410154043.GP3126663@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <20180410153812.GA3219@ming.t460p>
Hello,
On Tue, Apr 10, 2018 at 11:38:18PM +0800, Ming Lei wrote:
> I agree, the issue should be in driver's irq handler and .timeout in
> theory.
>
> For example, even though one request has been done by irq handler, .timeout
> still may return RESET_TIMER.
blk-mq can use a separate flag to track normal completions during
timeout and complete the request normally on RESET_TIMER if the flag
is set while EH was in progress. With a bit of care, we'd be able to
plug the race completely.
Thanks.
--
tejun
next prev parent reply other threads:[~2018-04-10 15:40 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-10 1:34 [PATCH v4] blk-mq: Fix race conditions in request timeout handling Bart Van Assche
2018-04-10 7:59 ` jianchao.wang
2018-04-10 10:04 ` Ming Lei
2018-04-10 12:04 ` Shan Hai
2018-04-10 13:01 ` Bart Van Assche
2018-04-10 14:32 ` jianchao.wang
2018-04-10 8:41 ` Ming Lei
2018-04-10 12:58 ` Bart Van Assche
2018-04-10 13:55 ` Ming Lei
2018-04-10 14:09 ` Bart Van Assche
2018-04-10 14:30 ` Ming Lei
2018-04-10 15:02 ` Bart Van Assche
2018-04-10 15:25 ` Ming Lei
2018-04-10 15:30 ` tj
2018-04-10 15:38 ` Ming Lei
2018-04-10 15:40 ` tj [this message]
2018-04-10 21:33 ` tj
2018-04-10 21:46 ` Bart Van Assche
2018-04-10 21:54 ` tj
2018-04-11 12:50 ` Bart Van Assche
2018-04-11 14:16 ` tj
2018-04-11 18:38 ` Martin Steigerwald
2018-04-11 14:24 ` Sagi Grimberg
2018-04-11 14:43 ` tj
2018-04-11 16:16 ` Israel Rukshin
2018-04-11 17:07 ` tj
2018-04-11 21:31 ` tj
2018-04-12 8:59 ` Israel Rukshin
2018-04-12 13:35 ` tj
2018-04-15 12:28 ` Israel Rukshin
2018-04-18 16:34 ` Bart Van Assche
2018-04-10 9:55 ` Christoph Hellwig
2018-04-10 13:26 ` Bart Van Assche
2018-04-10 14:50 ` hch
2018-04-10 14:41 ` Jens Axboe
2018-04-10 14:20 ` Tejun Heo
2018-04-10 14:30 ` Bart Van Assche
2018-04-10 14:33 ` tj
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