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

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Message-ID: <20120103132053.44ade1e3@pyramind.ukuu.org.uk>
Date:	Tue, 3 Jan 2012 13:20:53 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jack Stone <jwjstone@...tmail.fm>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Matthew Garrett <mjg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	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.

> That said, I guess there are more complicated / difficult pieces of
> hardware that might not do that. Is that the case here? Can we detect
> that the firmware needs reloading and have the primary driver "yield" to
> the firmware driver?

That doesn't really make any sense in the way USB works.

However if you've got a system to load and pin firmware *on suspend* and
flush it post resume then you don't actually need special 'firmware'
drivers just a slightly fancier lib/firmware that refcounts and handles
load on suspend/delayed flush.

(and probably a sysctl for cache tuning so that typical small firmwares
get cached on bigger boxes anyway for speed)
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