linux-kernel - Re: [PATCH 002 of 6] md: Change lifetime rules for 'md' devices.

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Date:	Tue, 31 Oct 2006 10:30:17 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Neil Brown <neilb@...e.de>
Cc:	Andrew Morton <akpm@...l.org>, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org, gregkh@...e.de
Subject: Re: [PATCH 002 of 6] md: Change lifetime rules for 'md' devices.

On Tue, Oct 31 2006, Neil Brown wrote:
> On Tuesday October 31, jens.axboe@...cle.com wrote:
> > On Tue, Oct 31 2006, Neil Brown wrote:
> > > 
> > > I'm guessing we need
> > > 
> > > diff .prev/block/elevator.c ./block/elevator.c
> > > --- .prev/block/elevator.c	2006-10-31 20:06:22.000000000 +1100
> > > +++ ./block/elevator.c	2006-10-31 20:06:40.000000000 +1100
> > > @@ -926,7 +926,7 @@ static void __elv_unregister_queue(eleva
> > >  
> > >  void elv_unregister_queue(struct request_queue *q)
> > >  {
> > > -	if (q)
> > > +	if (q && q->elevator)
> > >  		__elv_unregister_queue(q->elevator);
> > >  }
> > > 
> > > 
> > > Jens?  md never registers and elevator for its queue.
> > 
> > Hmm, but blk_unregister_queue() doesn't call elv_unregister_queue()
> > unless q->request_fn is set. And in that case, you must have an io
> > scheduler attached.
> 
> Hmm.. yes.  Oh, I get it.  I have
> 
> 	blk_cleanup_queue(mddev->queue);
> 	mddev->queue = NULL;
> 	del_gendisk(mddev->gendisk);
> 	mddev->gendisk = NULL;
> 
> That's the wrong order, isn't it. :-(

Yep, you want to reverse that :-)

-- 
Jens Axboe

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