linux-kernel - Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

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Message-Id: <1183712354.3388.126.camel@localhost.localdomain>
Date:	Fri, 06 Jul 2007 18:59:13 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Miklos Szeredi <miklos@...redi.hu>, pavel@....cz,
	paulus@...ba.org, johannes@...solutions.net,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	mjg59@...f.ucam.org
Subject: Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to
	RAM pathway

On Fri, 2007-07-06 at 09:13 +0200, Rafael J. Wysocki wrote:
> 
> The only reason (I know of) why we don't handle uninterruptible tasks in the
> freezer is that we're afraid of the suspend process deadlocking with an
> uninterruptible task holding a lock, but AFAICS the probability of such an
> event is extremely small.

What would deadlock specifically ? One of the drivers trying to acquire
that lock ? It would be a driver bug then.

> Also, the powermac suspend will deadlock in such cases, so the fact that
> it doesn't deadlock means that they don't occur very often (if at all).

Ben.


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