linux-kernel - Re: [Update][PATCH] PM / Hibernate: Fix s2disk regression related to unlock_system

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Message-ID: <20120119174038.GA25397@atrey.karlin.mff.cuni.cz>
Date:	Thu, 19 Jan 2012 18:40:38 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Tejun Heo <tj@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, horms@...ge.net.au,
	Len Brown <lenb@...nel.org>
Subject: Re: [Update][PATCH] PM / Hibernate: Fix s2disk regression related
 to unlock_system_sleep()

Hi!

> >> To give an example,
> >>
> >> 	/*
> >> 	 * XXX: Open code SKIP clearing for now to avoid invoking
> >> 	 * try_to_freeze().  This isn't correct but this function is
> >> 	 * called from deep inside hibernation path and calling
> >> 	 * try_to_freeze() leads to hang during hibernation.  This
> >> 	 * will be properly fixed soon.  See commit message for
> >> 	 * more details.
> >> 	 */
> > 
> > Which paths are affected?
> > 
> > With uswsusp, we have userland in control of hibernation process; I'd
> > say almost anything can be called...
> 
> 
> Hi Pavel,
> I am afraid you are looking at a stale comment. We finalized on a
> different comment altogether.

I know. But the underlying problem (uswsusp code is userland, and can
do anything) is still there, right? I guess limitations for
applications using uswsusp interface should be documented somewhere.
									Pavel

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