linux-kernel - Re: [linux-pm] [RFC][PATCH] PM: Introduce new top level suspend and hibernation callbacks (rev. 2)

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Message-Id: <200803251524.34147.oliver@neukum.org>
Date:	Tue, 25 Mar 2008 15:24:33 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	linux-pm@...ts.linux-foundation.org,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Johannes Berg <johannes@...solutions.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] [RFC][PATCH] PM: Introduce new top level suspend	and hibernation callbacks (rev. 2)

Am Dienstag, 25. März 2008 15:19:45 schrieb Alan Stern:
> On Tue, 25 Mar 2008, Oliver Neukum wrote:
> 
> > Am Dienstag, 25. MÃ¤rz 2008 14:06:15 schrieb Rafael J. Wysocki:
> > > On Tuesday, 25 of March 2008, Oliver Neukum wrote:
> > 
> > > > A device that cannot wake up is unusable. Shouldn't the pm core disconnect()
> > > > such a device?
> 
> It's not safe for the PM core to do such things unilaterally.  The 
> decision to unregister a device should be made by the driver or the 
> subsystem.

Why? You can trigger it from user space via sysfs and in many cases
suspending to disk will disconnect all devices on a bus, so I'd say a
failure to resume is just a limited subcase of a device vanishing during
sleep.

	Regards
		Oliver

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