linux-kernel - Re: [PATCH] blk-mq: fix up placement of debugfs directory of queue files

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Message-ID: <20190706165044.GA18886@kroah.com>
Date:   Sat, 6 Jul 2019 18:50:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH] blk-mq: fix up placement of debugfs directory of queue
 files

On Sat, Jul 06, 2019 at 10:07:14AM -0600, Jens Axboe wrote:
> On 7/6/19 9:50 AM, Greg Kroah-Hartman wrote:
> > When the blk-mq debugfs file creation logic was "cleaned up" it was
> > cleaned up too much, causing the queue file to not be created in the
> > correct location.  Turns out the check for the directory being present
> > is needed as if that has not happened yet, the files should not be
> > created, and the function will be called later on in the initialization
> > code so that the files can be created in the correct location.
> 
> How about we shove this in for 5.2 final? Trivial enough to do, and it
> would suck to have 5.2 released with this.

Sure, no objection from me!

> Though not sure what devices this actually impacts, I haven't noticed
> anything awry on my setups?

I can easily trigger this with loop devices.  I know Stephen reported
this and I don't know if that was the driver that caused it for him.  I
have also seen this happen in syzbot boot logs already, but again, don't
know what block devices they are using that causes this.

thanks,

greg k-h