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

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Message-ID: <20120103000016.640012da@pyramind.ukuu.org.uk>
Date:	Tue, 3 Jan 2012 00:00:16 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Matthew Garrett <mjg@...hat.com>,
	Jack Stone <jwjstone@...tmail.fm>,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.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>,
	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 Mon, 2 Jan 2012 13:27:03 -0800
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Mon, Jan 2, 2012 at 1:19 PM, Matthew Garrett <mjg@...hat.com> wrote:
> > On Mon, Jan 02, 2012 at 12:48:48PM -0800, Linus Torvalds wrote:
> >
> >> Why are you guys making it any more complicated than that?
> >
> > Because it's inadequate. You can't guarantee that we ever loaded
> > firmware.
> 
> If we didn't load the firmware before the suspend, then the resume
> function of a device sure as hell had better not load it at resume
> time either.

Get a clue. It is very common that devices keep firmware over OS warm
boots, particularly if onboard. "Lesser" beings than yourself consider it
a feature of good hardware design for fast booting and it works happily
in "lesser" OS products such Windows.

If you'd like a typical worked example the Fujitsu Q550 has a 3G modem on
it. So in the following cases we don't load firmware at boot but we do
need to after hibernate/resume

Boot windows, reboot to Linux
Boot Linux, reboot to Linux (first loads, second doesn't)

Break that and you have a regression and Linus says regressions are wrong
and we don't do them.

> And don't make the stupid argument that we don't know. That's just
> inane. Either the driver loads the firmware at startup, or it doesn't.

Wrong.

> Fix the 99%. Screw the crazy shit, don't even bother worrying about it
> until *after* the 99% is fixed.

This is the 99%. This is PC hardware, the 99% is crazy shit.

Alan
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