linux-kernel - Re: request_firmware vs. resume (was Re: [PATCH] bnx2

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Message-Id: <200807092358.32605.rjw@sisk.pl>
Date:	Wed, 9 Jul 2008 23:58:31 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Theodore Tso <tytso@....edu>
Cc:	Pavel Machek <pavel@...e.cz>, David Miller <davem@...emloft.net>,
	alan@...rguk.ukuu.org.uk, mchan@...adcom.com, dwmw2@...radead.org,
	bastian@...di.eu.org, linux-kernel@...r.kernel.org
Subject: Re: request_firmware vs. resume (was Re: [PATCH] bnx2 - use request_firmware())

On Wednesday, 9 of July 2008, Theodore Tso wrote:
> On Wed, Jul 09, 2008 at 11:13:54PM +0200, Rafael J. Wysocki wrote:
> > > Be careful about request_firmware. Doing it right w.r.t.
> > > suspend/resume is quite tricky: you have to load it from userspace
> > > before kernel starts, so that you can use it during resume...
> > 
> > Rather, you have to cache it in memory before your ->suspend() is invoked.
> 
> Translation: so much for saving "non-swappable kernel memory".
> Unless, of course we add a pre-suspend hook.  (Which doesn't exist
> yet, AFAICT from a quick perusal of Documentation/power/devices.txt.)

No, it doesn't.

You will be able to register a suspend notifier instead, but this requires
one fix which is in the works.

Thanks,
Rafael
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