linux-kernel - Re: [PATCH v4 6/7] blk-mq: fix freeze queue race

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Message-ID: <20150929150346.GB23411@mtj.duckdns.org>
Date:	Tue, 29 Sep 2015 11:03:46 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ming Lei <tom.leiming@...il.com>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v4 6/7] blk-mq: fix freeze queue race

Hello,

On Tue, Sep 29, 2015 at 09:01:31AM -0600, Jens Axboe wrote:
> I think that would be very useful, it seems sort of half-assed if the caller
> side has to provide serialization for that.

Yeah, the thing is init/exit are usually caller synchronized but
percpu_rwsem's kill/reinit are more of mode-switching operations which
can be performed concurrently during operation so I think the right
thing to do here is making it synchronize itself.  Will spin a patch.

Thanks.

-- 
tejun
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