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

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Message-Id: <1183855362.3388.233.camel@localhost.localdomain>
Date:	Sun, 08 Jul 2007 10:42:42 +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

On Sat, 2007-07-07 at 12:17 -0400, Alan Stern wrote:
> On Sat, 7 Jul 2007, Benjamin Herrenschmidt wrote:
> 
> > > > And guess what ? It's what we do on powerbooks, and it works fine,
> > > > without a freezer :-)
> 
> > If you remember, one of the things I've been advocating has always been
> > that we should put on hold all plug activity (unplug might be alright as
> > long as the user events are just delayed) when we start suspending. No
> > new devices, no new bindings. "hub" type devices are respondible for
> > bringing in the new stuff after resume.
> 
> Which is exactly my point.  It _doesn't_ work fine without a freezer, 
> because the USB stack currently relies on the freezer to prevent plug 
> activity.

Putting on hold plug activity has nothing, NOTHING, to do with the half
assed piece of deadlocking crap we have now we call a freezer.

As long as you guys keep mixing up all the issues and coming up with
totally bogus solutions that cannot work, we won't have a useful suspend
(either to RAM or to disk) in linux.

Ben.


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