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

From: Tejun Heo
Date: Tue Sep 29 2015 - 11:04:02 EST


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.


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