linux-kernel - Re: [PATCH 1/3] PM: Introduce new top level suspend and hibernation callbacks (rev. 8)

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Message-Id: <1208206056.6958.176.camel@pasglop>
Date:	Tue, 15 Apr 2008 06:47:36 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	David Brownell <david-b@...bell.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Greg KH <greg@...ah.com>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Pavel Machek <pavel@....cz>, Oliver Neukum <oliver@...kum.org>,
	Nigel Cunningham <ncunningham@...a.org.au>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3] PM: Introduce new top level suspend and
	hibernation callbacks (rev. 8)


On Mon, 2008-04-14 at 10:51 -0400, Alan Stern wrote:
> On Sun, 13 Apr 2008, David Brownell wrote:
> 
> > I sort of agree.  Looking at it from a whole-system perspective,
> > suspending needs to be able to chitchat with userspace ... and I
> > don't think that can be done *before* writing to /sys/power/state
> > in an acceptably generic/portable way.  (Briefly, applications
> > need to have clean stopping points and be able to arrange system
> > wakeup.  They may well have more work to do than most drivers.)
> 
> Pavel's recent work aside, the only way to initiate a system sleep is 
> from userspace.  So it seems natural for all application notifications 
> to be made by the initiating program, perhaps via dbus.

No. Certainly not via dbus.

Ben.


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