From: Marek Vasut <marek.vasut@gmail.com>
To: Michael =?iso-8859-1?q?B=FCsch?= <m@bues.ch>
Subject: Re: loading firmware while usermodehelper disabled.
Date: Mon, 2 Jan 2012 04:24:54 +0100
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Oliver Neukum <oliver@neukum.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Dave Jones <davej@redhat.com>,
	Linux Kernel <linux-kernel@vger.kernel.org>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	Chaoming Li <chaoming_li@realsil.com.cn>,
	"John W. Linville" <linville@tuxdriver.com>,
	Matthew Garrett <mjg@redhat.com>,
	"Greg Kroah-Hartman" <gregkh@suse.de>,
	USB list <linux-usb@vger.kernel.org>,
	Linux Wireless List <linux-wireless@vger.kernel.org>
References: <20111230235421.GA6054@redhat.com> <20120101203945.0ebc2f55@pyramind.ukuu.org.uk> <20120101215000.04b13f43@milhouse>
In-Reply-To: <20120101215000.04b13f43@milhouse>
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> On Sun, 1 Jan 2012 20:39:45 +0000
> 
> Alan Cox <alan@lxorguk.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