Re: [RFC][PATCH -mm 3/3] PM: Disable _request_firmware before hibernation/suspend

[Pavel Machek]

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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