linux-kernel - Re: [bisected] 2.6.31 regression sis5513 PIO Mode 0 hang

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Message-ID: <4AC7F306.2040409@gmail.com>
Date:	Sat, 03 Oct 2009 18:57:42 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	David Fries <david@...es.net>
CC:	linux-kernel@...r.kernel.org, d.stussy@...oo.com,
	Joao Ramos <joao.ramos@...v.pt>,
	Linus Torvalds <torvalds@...l.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [bisected] 2.6.31 regression sis5513 PIO Mode 0 hang

On 10/02/2009 08:54 PM, David Fries wrote:
> I just did a git bisection from 2.6.30 to 2.6.31 because 2.6.31 will
> not boot on this system.  d.stussy@...oo.com's post September 12th
> looks the same, different CPU but both have sis5513 IDE chips.  His
> would normally init the ethernet chip next, mine would do PS/2 next,
> both hang right after the Uniform CD-ROM message.
>
> This was bisected down to chaging PIO mode 0 for probing.  What
> problem was that patch trying to solve?  Reverting just that patch at
> the top of 2.6.31 tree works.  I can test patches.
>
> Assigned bugzilla.kernel.org bug 14310

Well, it's the right thing to do (libata does it) but presumably doing 
that in old IDE is triggering some kind of bug. Unless there's a 
specific problem it was solving, or someone is interested in debugging 
in detail (I'm certainly not interested in drivers/ide) it should likely 
be reverted as we've done without it for so long..
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