linux-kernel - Re: SATA exceptions with 2.6.20-rc5

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Message-ID: <20070121184032.GA3220@atjola.homenet>
Date:	Sun, 21 Jan 2007 19:40:32 +0100
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	Robert Hancock <hancockr@...w.ca>, Jeff Garzik <jeff@...zik.org>,
	Chr <chunkeey@....de>,
	Alistair John Strachan <s0348365@....ed.ac.uk>,
	linux-kernel@...r.kernel.org, htejun@...il.com,
	jens.axboe@...cle.com, lwalton@...l.com
Subject: Re: SATA exceptions with 2.6.20-rc5

On 2007.01.21 09:36:18 +0100, Björn Steinbrink wrote:
> On 2007.01.21 00:39:20 -0600, Robert Hancock wrote:
> > Björn Steinbrink wrote:
> > >On 2007.01.20 22:34:27 -0500, Jeff Garzik wrote:
> > >>Robert Hancock wrote:
> > >>>change in 2.6.20-rc is either causing or triggering this problem. It 
> > >>>would be useful if you could try git bisect between 2.6.19 and 
> > >>>2.6.20-rc5, keeping the latest sata_nv.c each time, and see if that 
> > >>
> > >>Yes, 'git bisect' would be the next step in figuring out this puzzle.
> > >>
> > >>Anybody up for it?
> > >
> > >I'll go for it, but could I get an explanation how that could lead to a
> > >different result than my last bisection? I see the difference of keeping
> > >sata_nv.c but my brain can't wrap around it right now (woke up in the
> > >middle of the night and still not up to speed...).
> > 
> > Whatever the problem is, only seems to show up when ADMA is enabled, and 
> > so the patch that added ADMA support shows up as the culprit from your 
> > git bisect. However, from what Chr is reporting, 2.6.19 with the ADMA 
> > support added in doesn't seem to have the problem, so presumably 
> > something else that changed in the 2.6.20-rc series is triggering it. 
> > Doing a bisect while keeping the driver code itself the same will 
> > hopefully identify what that change is..
> 
> Ah, right... sata_nv.c of course interacts with the outside world, d'oh!
> 
> Up to now, I only got bad kernels, latest tested being:
> 94fcda1f8ab5e0cacc381c5ca1cc9aa6ad523576
> 
> Which, unless I missed a commit in the diff, only USB changes,
> continuing anyway.

All kernels were bad using that approach. So back to square 1. :/

Björn
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