linux-kernel - Re: [PATCH 2/8] introduce the device async action mechanism

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Message-ID: <20090719221658.GL26511@elf.ucw.cz>
Date:	Mon, 20 Jul 2009 00:16:58 +0200
From:	Pavel Machek <pavel@....cz>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 2/8] introduce the device async action mechanism

Hi!

> >  During suspend-resume we know dependencies between
> > devices beforehand, at least in theory, so we can use them.
> > 
> that's why I use multiple async domains. :)
> One domain for a device group.
> 
> > In particular, we have to make sure that parent devices will not be suspended
> > until all of their children have been suspended and children devices will not
> > be resumed before the parents.
> 
> that's not enough.
> ???For examples,
> ACPI battery and EC are independent devices, but EC must be resumed
> before battery because battery driver may access some EC address space
> during resume time.

Yes, but those dependencies should be pulled from driver tree, not
adding separate dependencies infrastructure.

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