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

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Date:	Mon, 09 Jul 2007 19:14:09 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kyle Moffett <mrmacman_g4@....com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>,
	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 Mon, 2007-07-09 at 08:52 +0200, Oliver Neukum wrote:
> Am Sonntag, 8. Juli 2007 schrieb Benjamin Herrenschmidt:
> > Another issue that's been a problem forever with suspend is the
> > synchronous request_firmware interface. Lots of drivers do that in
> > resume() which will generally not work.
> 
> Unfortunately yes they do. We now have the notifier chains, which
> can be used. Firmware, especially if it is large, must be requested
> while the system is still fully functional and paging will work.
> 
> Asynchronocity will not help much because the devices must work
> after resumingand delaying that will not help with respect to needing
> devices to get at the firmware.

True, pre-loading is the best approach.

Ben.


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