linux-kernel - Re: loading firmware while usermodehelper disabled.

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Message-Id: <201201020424.54444.marek.vasut@gmail.com>
Date:	Mon, 2 Jan 2012 04:24:54 +0100
From:	Marek Vasut <marek.vasut@...il.com>
To:	Michael Büsch <m@...s.ch>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Oliver Neukum <oliver@...kum.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Larry Finger <Larry.Finger@...inger.net>,
	Chaoming Li <chaoming_li@...lsil.com.cn>,
	"John W. Linville" <linville@...driver.com>,
	Matthew Garrett <mjg@...hat.com>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	USB list <linux-usb@...r.kernel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>
Subject: Re: loading firmware while usermodehelper disabled.

> On Sun, 1 Jan 2012 20:39:45 +0000
> 
> Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> > When you suspend the power gets killed so the device loses its firmware
> > and goes back to being a firmware requesting thing on resume.
> > 
> > Worse still - you don't easily know if the device is in fact new and was
> > added while suspended, or was always there.
> > 
> > So for those devices you do need to load the firmware into them
> > automatically after the resume to work out what they are and get the MAC
> > to see if its the same wireless card or not.
> 
> Well, that does not prevent you from caching the firmware once you
> got it from userspace and keep it until module unload (or probably device
> close), so that it is already available on resume.

That's actually wrong. If you cached every single firmware, the kernel would 
gulp down a lot of space that can't be swapped out!

M
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