linux-kernel - Re: [patch] PM: suspend/resume debugging should depend on SOFTWARE

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Date:	Sun, 26 Nov 2006 21:52:35 +0100
From:	Pavel Machek <pavel@....cz>
To:	Alan <alan@...rguk.ukuu.org.uk>
Cc:	Adrian Bunk <bunk@...sta.de>, Linus Torvalds <torvalds@...l.org>,
	Chuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, seife@...e.de
Subject: Re: [patch] PM: suspend/resume debugging should depend on SOFTWARE_SUSPEND

Hi!

> > Hmm... how common are these machines? We are using unpatched kernel
> > for suse10.2... OTOH we only support machines from the whitelist, all
> 
> I've always said IDE and software suspend are unsafe. The more work I do
> the more clearly this is/was the case.

Well, there's unsafe as in  "crashes", and that's unsafe as in "eats
disks".

> The really nasty "resume eats your disk" cases I know about are
> thankfully for older systems - VIA KT133 and similar era chipsets.

Aha, good. Hopefully noone has notebook with those.

> There is a recent nasty - Jmicron goes totally to **** on resume because
> of resume quirks not being run but it goes so spectacularly wrong it
> doesn't seem to get far enough to corrupt.

Good :-). Crashing is nasty, but we probably won't add that machine to
whitelist.

> Andrew has about 2/3rds of the bits I've done now, will push the rest
> when I've done a little more testing/checking. At that point libata ought
> to be resume safe. Someone who cares about drivers/ide legacy support can
> then copy the work over.

Thanks. I do not think we care about old mainboards enough to do
2.6.16-stable backport.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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