linux-kernel - Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

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Message-ID: <20070528125507.GI18807@elf.ucw.cz>
Date:	Mon, 28 May 2007 14:55:07 +0200
From:	Pavel Machek <pavel@....cz>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Romano Giannetti <romanol@...omillas.es>,
	Chris Wright <chrisw@...s-sol.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable@...nel.org, Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk
Subject: Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

Hi!

> > > This /mostly/ works - I've had my test machine cycling through a suspend 
> > > cycle every 10 seconds for the past hour without any difficulties 
> > > providing I unload USB first. If USB is loaded, the suspend occasionally 
> > > fails with one of the devices returning -EBUSY and causing it to be 
> > > aborted. I haven't looked into this in any detail yet, but it's 
> > > presumably sufficiently generic code that it's potentially biting people 
> > > on PPC anyway.
> > 
> > Most probably.
> > 
> > Still, please take what I said in the other thread into consideration: We've
> > been using the freezer for so long that at least some drivers started to rely
> > on it being used.
> > 
> > Even if there are no such drivers on your system, they can be used by other
> > systems.
> 
> Sure, but if any of these drivers run on PPC then they're broken anyway. 
> The assumption that processes will be frozen during suspend is true in 
> the specific case of ACPI and some of the ARM platforms, but not true on 
> PPC or APM systems. We either need to fix the drivers to stop assuming 
> this or add the process freezer to the other PM systems. Right now, 
> they're buggy.

Well, PPC people are aware of this, and they think they can fix the
drivers. We probably want to drop the freezer for suspend long-term,
so. PPC machines use small subset of all the drivers, so it apparently
is not big problem for them.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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