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

Pavel Machek
2007-05-28T20:59:51Z

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.

--
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