[Regression] 2.6.28-rc1 (2fca5c): libata: kernel cant boot (was: Re: 2.6.27-rc1 (2fca5c): libata: kernel cant boot)

[Rafael J. Wysocki]

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@xxxxxxxxxx>
> > 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).

Reverting the commit also helps here.

[I guess it's going to break things left and right.]

> 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.

Thanks,
Rafael
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