linux-kernel - Re: kernel BUG at ide-cd.c:1726 in 2.6.24-03863-g0ba6c33 && -g8561b089

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Message-ID: <20080131150418.GD15220@kernel.dk>
Date:	Thu, 31 Jan 2008 16:04:18 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Florian Lohoff <flo@...822.org>
Cc:	Nai Xia <nai.xia@...il.com>, Roland Dreier <rdreier@...co.com>,
	Kiyoshi Ueda <k-ueda@...jp.nec.com>, bzolnier@...il.com,
	bbpetkov@...oo.de, linux-kernel@...r.kernel.org,
	j-nomura@...jp.nec.com, linux-ide@...r.kernel.org
Subject: Re: kernel BUG at ide-cd.c:1726 in 2.6.24-03863-g0ba6c33 && -g8561b089

On Thu, Jan 31 2008, Florian Lohoff wrote:
> On Thu, Jan 31, 2008 at 02:05:58PM +0100, Jens Axboe wrote:
> > The below fix should be enough. It's perfectly legal to have leftover
> > byte counts when the drive signals completion, happens all the time for
> > eg user issued commands where you don't know an exact byte count.
> > 
> > diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
> > index 74c6087..bee05a3 100644
> > --- a/drivers/ide/ide-cd.c
> > +++ b/drivers/ide/ide-cd.c
> > @@ -1722,7 +1722,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
> >  	 */
> >  	if ((stat & DRQ_STAT) == 0) {
> >  		spin_lock_irqsave(&ide_lock, flags);
> > -		if (__blk_end_request(rq, 0, 0))
> > +		if (__blk_end_request(rq, 0, rq->data_len))
> >  			BUG();
> >  		HWGROUP(drive)->rq = NULL;
> >  		spin_unlock_irqrestore(&ide_lock, flags);
> > 
> 
> Fixes the crash on boot for me ...

Great, thanks for confirming that. I'll make sure the patch goes
upstream today, if Linus is available.

-- 
Jens Axboe

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