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

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Date:	Mon, 28 May 2007 12:04:48 +0200
From:	Pavel Machek <pavel@....cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.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,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

Hi!

> > As far as I can tell the PPC code simply shuts down the devices without 
> > worrying about userspace at all. If this was reliable, what prevents us 
> > from simply disabling the freezer for STR?
> 
> Personally, I think that's the right thing to do. 
> 
> And by "disabling the freezer", I think we should just not call it at all. 
> However, sadly, right now it's called from common code. I'll happily take 
> a tested patch to split that code sequence up, and try to do it in 2.6.23, 
> if somebody has the energy (I'm getting to the point where I may just do 
> it myself, but my lazy nature still hopes for a STR person to step 
> forward).

I guess we should warn the driver authors, then; and decide what
driver authors should do.

If I'm video4linux driver for grabbing screen, have been suspended,
and someone asks me to read a frame, should I

a) return -ESORRYIMSUSPENDED

b) just block the caller

?

a) seems ugly to my eyes (userspace should not know about suspend).
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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