linux-kernel - Re: [RFC][PATCH -mm 3/3] PM: Disable _request

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Date:	Mon, 28 May 2007 20:59:51 +0000
From:	Pavel Machek <pavel@....cz>
To:	Ray Lee <ray-lk@...rabbit.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Oliver Neukum <oliver@...kum.org>
Subject: Re: [RFC][PATCH -mm 3/3] PM: Disable _request_firmware before hibernation/suspend

Hi!

> >In fact, I'd like drivers to use notifiers to actually 
> >load the firmware into
> >memory before hibernation/suspend.  Namely, if there's 
> >PM_PRE_FREEZE, the
> >driver calls request_firmware() from within the 
> >notifier and saves the firmware
> >in memory for future use, if need be.  Later, when 
> >PM_POST_THAW comes, the
> >memory holding the firmware is released.
> >
> >Unfortunately there are drivers that call 
> >request_firmware() directly from
> >.resume() which blocks until timeout expires and fails 
> >anyway.  I just wanted
> >this to fail immediately, without waiting.
> 
> Stupid question time. Wouldn't it just be easier to have
> request_firmware() keep a copy of the firmware once it's 
> been loaded?
> We're not talking about a lot of memory that would be 
> wasted, and that
> way no drivers have to be changed.

Actually, I like this idea. Firmware problems magically disappear.

...unless someone uses x86 emulator in userland to POST graphics card.
You can't 'cache' that. But that's separate problem.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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