linux-kernel - Re: driver power operations (was Re: suspend2 merge)

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Message-ID: <20070507122915.GF20605@elf.ucw.cz>
Date:	Mon, 7 May 2007 14:29:15 +0200
From:	Pavel Machek <pavel@....cz>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Nick Piggin <npiggin@...e.de>,
	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	Adrian Bunk <bunk@...sta.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Con Kolivas <kernel@...ivas.org>,
	suspend2-devel@...ts.suspend2.net, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-pm <linux-pm@...ts.linux-foundation.org>
Subject: Re: driver power operations (was Re: suspend2 merge)

Hi!

> > > So, the "suspend" and "resume" for the functions being called for that are
> > > wrong, but then we call them with PMSG_FREEZE. ;-)  Still, we could add
> > > .freeze() and .thaw() callbacks for hibernation just fine.  This wouldn't even
> > > be that difficult ...
> > 
> > It would be ugly big patch I'm afraid.
> 
> It'd be a lot of code churn, but well worth it. And most of the changes
> would be trivial too. You need to start looking beyond "this is ugly in
> the short term" and realise that it's much more maintainable in the long
> term if driver writers know what they're supposed to do as opposed to
> just hacking at it until it mostly works or just doing a full device
> down/up cycle including resetting full driver state.

I do not disagree with you. It will be ugly big patch, but it is
probably worth it, so the patch will be welcome.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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