linux-kernel - Re: udev breakages - was: Re: Need of an ".async_probe()" type of callback at driver's core - Was: Re: [PATCH] [media] drxk: change it to use request_firmware

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Message-ID: <CA+55aFwVFtUU4TCjz4EDgGDaeR_QwLjmBAJA0kijHkQQ+jxLCw@mail.gmail.com>
Date:	Wed, 3 Oct 2012 15:58:22 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Walls <awalls@...metrocast.net>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Ming Lei <ming.lei@...onical.com>, Kay Sievers <kay@...y.org>,
	Lennart Poettering <lennart@...ttering.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kay Sievers <kay@...hat.com>,
	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Ivan Kalvachev <ikalvachev@...il.com>
Subject: Re: udev breakages - was: Re: Need of an ".async_probe()" type of
 callback at driver's core - Was: Re: [PATCH] [media] drxk: change it to use request_firmware_nowait()

On Wed, Oct 3, 2012 at 3:48 PM, Andy Walls <awalls@...metrocast.net> wrote:
>
> I don't know if you can remove the /sys/.../firmware ABI altogether, because there is at least one, somewhat popular udev replacement that also uses it: mdev
>
> http://git.busybox.net/busybox/plain/docs/mdev.txt

Heh. That web doc documents /lib/firmware as being the place to be.

That said, there's clearly enough variation here that I think that for
now I won't take the step to disable the udev part. I'll do the patch
to support "direct filesystem firmware loading" using the udev default
paths, and that hopefully fixes the particular case people see with
media modules.

We definitely want to have configurable paths and a way to configure
udev entirely off for firmware (together with a lack of paths
configuring the direct filesystem loading off - that way people can
set things up just the way they like), but since I'm travelling
tomorrow and this clearly needs more work, I'll do the first step only
for now..

                Linus
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