linux-kernel - Re: 2.6.29 regression: ATA bus errors on resume

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Message-Id: <200903281506.03364.rjw@sisk.pl>
Date:	Sat, 28 Mar 2009 15:06:02 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Niel Lambrechts <niel.lambrechts@...il.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	"linux.kernel" <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Pavel Machek <pavel@....cz>,
	Linux IDE mailing list <linux-ide@...r.kernel.org>,
	Jeff Garzik <jeff@...zik.org>, Tejun Heo <htejun@...il.com>
Subject: Re: 2.6.29 regression: ATA bus errors on resume

On Saturday 28 March 2009, Niel Lambrechts wrote:
> On 03/28/2009 12:30 AM, Arjan van de Ven wrote:
> > On Fri, 27 Mar 2009 21:10:52 +0200
> > Niel Lambrechts <niel.lambrechts@...il.com> wrote:
> >
> >   
> >> I'm seeing some dubious looking ATA messages even on 2.6.28.9-pae,
> >> although with all the 2.6.28 variants I used s2disk/resume has always
> >> worked. I was wondering if these "errors" perhaps play more of a role
> >> in 2.6.29, perhaps due to the async. changes that was mentioned?
> >>     
> >
> > unless you actively enabled this via a kernel command line option there
> > are no async changes in 2.6.29 in terms of behavior.
> >
> >
> >   
> The only non-default option I had was 'modeset=1'. From Jeff's earlier
> comment I understood the probing behaviour changed.
> 
> The fundamental difference is that in 2.6.29 everything initially seems
> okay, but then there is a
> ata1.00: exception Emask 0x10 SAct 0x3f SErr 0x50000 action0xe frozen
> ata1.00: irq_stat 0x00400008, PHY RDY changed
> 
> There's nothing frozen it 2.6.28.
> 
> Should I log a kernel bug, what's the best way forward and is there
> anything more I can do to help?

Let Tejun have a look a this, perhaps?

Rafael
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