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

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Date:	Sat, 7 Jul 2007 12:17:06 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
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, 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.

Alan Stern

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