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

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Date:	Sun, 08 Jul 2007 14:39:36 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kyle Moffett <mrmacman_g4@....com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH] Remove process freezer from suspend to RAM pathway


> In my defense, you should realize that until Rafael's notifier chain
> was added (just a few weeks ago, still not in mainline I believe) there
> was no other way to do it.  Plug activity needs to be stopped before
> the child devices are suspended, and the PM core does not send any
> notification to drivers at that time.  All it does is activate the 
> freezer.

That's true. That was one of the reason I've always wanted the
pre-suspend and post-resume hooks. (I prefer keeping the ordering there
too, rather than a notifier, but a notifier is fine I suppose).

Among the clients we want here the firmware stuff, the allocators,
etc... to get themselves in conditions that won't deadlock during
suspend cycle.

I think that's a much bigger issue overall than freezer vs. no
freezer :-)

Ben.


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