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

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Message-Id: <1180392783.4149.18.camel@nigel.suspend2.net>
Date:	Tue, 29 May 2007 08:53:03 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Pavel Machek <pavel@....cz>, "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.

On Mon, 2007-05-28 at 14:03 +0100, Matthew Garrett wrote:
> On Mon, May 28, 2007 at 02:55:07PM +0200, Pavel Machek wrote:
> 
> > 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.
> 
> I'm fairly certain that PPC uses USB. In any case, it's not limited to 
> PPC - APM has the same issue. Any driver that assumes processes will be 
> frozen during suspend to RAM is broken now, not the future.

The converse is also true, though. Any process that assumes processes
aren't frozen during suspend to RAM is also broken now, and will be
while we allow the possibility of suspending to ram after writing a
hibernation image.

In short, drivers should be designed to work whether processes are
frozen or not.

Regards,

Nigel

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