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From: Sagi Grimberg <sagi@grimberg.me>
To: Ming Lei <ming.lei@redhat.com>, Bart Van Assche <bart.vanassche@wdc.com>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
	Tejun Heo <tj@kernel.org>, Israel Rukshin <israelr@mellanox.com>,
	Max Gurtovoy <maxg@mellanox.com>,
	stable@vger.kernel.org
Subject: Re: [PATCH v5] blk-mq: Avoid that a completion can be ignored for BLK_EH_RESET_TIMER
Date: Wed, 11 Apr 2018 16:10:09 +0300	[thread overview]
Message-ID: <41f15d7f-a119-1b00-52cf-e1a34aee9ba8@grimberg.me> (raw)
In-Reply-To: <20180411021104.GC4494@ming.t460p>


>> The blk-mq timeout handling code ignores completions that occur after
>> blk_mq_check_expired() has been called and before blk_mq_rq_timed_out()
>> has reset rq->aborted_gstate. If a block driver timeout handler always
>> returns BLK_EH_RESET_TIMER then the result will be that the request
>> never terminates.
> 
> Under this situation:
> 
> IMO, if this request has been handled by driver's irq handler, and if
> driver's .timeout still returns BLK_EH_RESET_TIMER, it is driver's bug,
> and the correct return value should be BLK_EH_HANDLED.

Is it possible to guarantee this efficiently if the irq handler
can run concurrently with the timeout handler?

  reply	other threads:[~2018-04-11 13:10 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-10 21:01 [PATCH v5] blk-mq: Avoid that a completion can be ignored for BLK_EH_RESET_TIMER Bart Van Assche
2018-04-11  2:11 ` Ming Lei
2018-04-11 13:10   ` Sagi Grimberg [this message]
2018-04-11 13:36   ` Bart Van Assche
2018-04-11 13:36     ` Bart Van Assche
2018-04-12 13:21   ` Christoph Hellwig
2018-04-11 13:19 ` Sagi Grimberg
2018-04-11 13:34   ` Bart Van Assche
2018-04-11 13:34     ` Bart Van Assche
2018-04-11 14:32     ` Sagi Grimberg
2018-04-11 14:34       ` Bart Van Assche
2018-04-11 14:34         ` Bart Van Assche
2018-04-12  5:32   ` Christoph Hellwig
2018-04-12 13:23 ` Christoph Hellwig
2018-04-14  0:06 ` Ming Lei

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