linux-kernel - Re: [PATCH] kernel/resource.c: fix muxed resource handling in __request

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Message-ID: <20160223213835.50e42ca5@lxorguk.ukuu.org.uk>
Date:	Tue, 23 Feb 2016 21:38:35 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Simon Guinot <simon.guinot@...uanux.org>,
	Alan Cox <alan@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Vincent Pelletier <plr.vincent@...il.com>,
	Giel van Schijndel <me@...tis.eu>,
	linux-gpio@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Vincent Donnefort <vdonnefort@...il.com>,
	Yoann Sculo <yoann@...lo.fr>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] kernel/resource.c: fix muxed resource handling in
 __request_region()

> > IORESOURCE_MUXED is a convenient way to deal with that. For some code
> > examples you can look at the superio_* functions in the IT87 drivers:
> > gpio/gpio-it87.c, hwmon/it87.c and watchdog/it87_wdt.c.
> > 
> > I am not aware of any other users for IORESOURCE_MUXED.
> > 
> > Let me know how you want to go and if you need my help.  
> 
> I'd be happy if you proposed a patch.  It would also be nice if we could
> somehow more formally limit the MUXED usage to these super I/O devices,
> just so other users don't get into trouble thinking it's more general
> than it is.

Today I think the problem wouldn't exist. We'd tell the authors of the
drivers to create an mfd or similar to manage the resources and load the
appropriate extra goodies.

Alan