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

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Message-ID: <20120119103707.GA13308@elf.ucw.cz>
Date:	Thu, 19 Jan 2012 11:37:07 +0100
From:	Pavel Machek <pavel@....cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"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!

> > > I agree, but I was trying to keep the comment from growing too long ;)
> > 
> > It doesn't have to be long.  It just has to give some meaning to the
> > decision.  AFAICS, it is correct to call try_to_freeze() on
> > unlock_system_sleep() regardless of 20sec window.  There's no
> > guarantee the unlocking task is gonna hit try_to_freeze() elsewhere
> > and not calling it actually makes the interface buggy.
> 
> 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...
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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