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

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Message-ID: <20070524223200.GE9604@elf.ucw.cz>
Date:	Fri, 25 May 2007 00:32:00 +0200
From:	Pavel Machek <pavel@....cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

Hi!
> 
> On Fri, 25 May 2007, Pavel Machek wrote:
> > > 
> > > Equally arguably, we should just have a "resume_late()" call that can be 
> > > used to do this after everything is up and running.
> > 
> > Yes, we can do that. But userland will see devices "not there" for a
> > few seconds after boot.
> 
> No they won't.
> 
> Why the HELL cannot you realize that kernel threads are different?
> 
> The right thing to do is AND HAS ALWAYS BEEN, to stop and start user 
> threads only around the whole thing.
> 
> Don't touch those kernel threads. Stop freezing them.
> 
> Then, what you do is:
>  - stop user space
>  - suspend
>  - resume
~~~~~~~~~~~
notice how resume of pcmcia card that poor user has needs
userspace. So this does not work.

>  - start user space

My proposed solution is "fix pcmcia to load firmware before suspend
even starts"

- HERE
>  - stop user space
>  - suspend
>  - resume
>  - start user space

Maybe freezer causes cancer in small children, but lets not blame it
for this.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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