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Date:	Sat, 8 Mar 2014 22:29:46 -0500
From:	Mike Snitzer <>
To:	Jens Axboe <>
Cc:	Hannes Reinecke <>, Mike Snitzer <>,
	Christoph Hellwig <>,
	Jeff Moyer <>, Shaohua Li <>,
	"" <>
Subject: Re: block: fix q->flush_rq NULL pointer crash on dm-mpath flush

On Sat, Mar 08 2014 at 10:18pm -0500,
Jens Axboe <> wrote:

> On 2014-03-08 17:57, Mike Snitzer wrote:
> >
> >I had a look at what you queued, thing is commit 1874198 replaced code
> >in blk_kick_flush() that did use list_add_tail().  So getting back to
> >the way the original code  was (before 1874198) would need something
> >like the following patch.
> >
> >But it isn't clear to me why we'd have the duality of front vs tail
> >additions for flushes.  Maybe Christoph knows?
> Not sure it'd even make a difference with the use case, but always
> tail would be broken. But the flushing in general is a bit of a
> nightmare, so I'd be inclined to add your full fix too, at least
> this late in -rc.

OK, please feel free to add my Signed-off-by.
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