linux-kernel - Re: [PATCH] PM: Acquire device locks on suspend

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Message-ID: <Pine.LNX.4.44L0.0801101202470.2727-100000@iolanthe.rowland.org>
Date:	Thu, 10 Jan 2008 12:04:06 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Johannes Berg <johannes@...solutions.net>,
	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH] PM: Acquire device locks on suspend

On Thu, 10 Jan 2008, Rafael J. Wysocki wrote:

> > > > > > Also, the kerneldoc for destroy_suspended_device() should contain an 
> > > > > > extra paragraph warning that the routine should never be called except 
> > > > > > within the scope of a system sleep transition.  In practice this means 
> > > > > > it has to be directly or indirectly invoked by a suspend or resume 
> > > > > > method.
> > > > > 
> > > > > Or by a CPU hotplug notifier (that will be the majority of cases, IMO).
> > > > 
> > > > In your patch the call is made in response to a CPU_UP_CANCELED_FROZEN
> > > > notification.  Isn't it true that this notification is issued only as
> > > > part of a system sleep transition?
> > > 
> > > Yes, it is.
> > 
> > So it counts as being indirectly invoked by a resume method.
> 
> Rather, by the resume core.  Technically, it's invoked by
> enable_nonboot_cpus(), which is not a resume method literally.

Okay, then the routine should only be called directly or indirectly 
from a suspend or resume method or from the suspend or resume core.

Alan Stern

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