From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [Regression] 2.6.28-rc1 (2fca5c): libata: kernel cant boot (was: Re: 2.6.27-rc1 (2fca5c): libata: kernel cant boot)
Date: Fri, 24 Oct 2008 10:56:01 +0200
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Cc: Alexander Beregalov <a.beregalov@gmail.com>, tj@kernel.org,
       torvalds@linux-foundation.org, LKML <linux-kernel@vger.kernel.org>,
       linux-ide@vger.kernel.org
References: <a4423d670810240004t2d7c3bdah2bea77a6a49bb7c4@mail.gmail.com> <200810241018.53645.rjw@sisk.pl> <20081024081626.GZ22217@kernel.dk>
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On Friday, 24 of October 2008, Jens Axboe wrote:
> On Fri, Oct 24 2008, Rafael J. Wysocki wrote:
> > On Friday, 24 of October 2008, Jens Axboe wrote:
> > > On Fri, Oct 24 2008, Rafael J. Wysocki wrote:
> > > > On Friday, 24 of October 2008, Jens Axboe wrote:
> > > > > On Fri, Oct 24 2008, Alexander Beregalov wrote:
> > > > > > Hi
> > > > > > 
> > > > > > commit 2fca5ccf97d2c28bcfce44f5b07d85e74e3cd18e
> > > > > > Author: Jens Axboe <jens.axboe@oracle.com>
> > > > > > Date:   Wed Oct 22 09:34:49 2008 +0200
> > > > > > 
> > > > > >     libata: switch to using block layer tagging support
> > > > > > 
> > > > > > 
> > > > > > This kernel can not read even 0 sector on disk with rootfs. It
> > > > > > initialized disk, but cant read it at all.
> > > > > >  CMD646 on Sparc
> > > > > > 
> > > > > > Rverting helped.
> > > > 
> > > > Confirmed on hp nx6325 w/ pata_atiixp (apparently, SCSI commands time out).
> > > 
> > > Basically it'll dererence ->qcmd[] with -1 index so it'll break in
> > > various interesting ways, I'm sure.
> > > 
> > > > Reverting the commit also helps here.
> > > > 
> > > > [I guess it's going to break things left and right.]
> > > 
> > > Indeed.
> > > 
> > > > > Doh, how annoying! What driver does that controller use? PATA doesn't
> > > > > even use NCQ, so it's a bit of an oddity that it makes a difference at
> > > > > all.
> > > > > 
> > > > > Can you provide the boot messages?
> > > > 
> > > > If I'm able to reproduce the breakage of Asus L5D, I will.
> > > 
> > > I don't need that anymore, I realized the mistake right after sending
> > > that.
> > 
> > The fix you posted helps here too. :-)
> 
> Good, please boot your regression time machine and get it committed
> before -rc1 was released :-)

Well, in fact it won't be listed if Linus merges the fix quickly enough. ;-)

Thanks,
Rafael
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