linux-kernel - Re: [PATCH] ARM: w1-gpio: fix erroneous gpio requests

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Date:	Wed, 13 Mar 2013 04:24:20 +0800
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Johan Hovold <jhovold@...il.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Imre Kaloz <kaloz@...nwrt.org>,
	Krzysztof Halasa <khc@...waw.pl>,
	Eric Miao <eric.y.miao@...il.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Daniel Mack <zonque@...il.com>,
	Ville Syrjälä <syrjala@....fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	stable <stable@...r.kernel.org>
Subject: Re: [PATCH] ARM: w1-gpio: fix erroneous gpio requests


On Mar 13, 2013, at 4:20 AM, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> On Tue, Mar 12, 2013 at 08:21:34PM +0100, Johan Hovold wrote:
>> Fix regression introduced by commit d2323cf773 ("onewire: w1-gpio: add
>> ext_pullup_enable pin in platform data") which added a gpio entry to the
>> platform data, but did not add the required initialisers to the board
>> files using it. Consequently, the driver would request gpio 0 at probe,
>> which could break other uses of the corresponding pin.
>> 
>> On AT91 requesting gpio 0 changes the pin muxing for PIOA0, which, for
>> instance, breaks SPI0 on at91sam9g20.

not only on AT91, 0 is a valid gpio
>> 
>> Cc: stable <stable@...r.kernel.org>
>> Signed-off-by: Johan Hovold <jhovold@...il.com>
>> ---
>> 
>> Not sure whose tree this should go in through, so adding relevant maintainers
>> and authors as CC.
> 
> As I took the offending patch, I might as well take this fix for it as
> well.
> 
> Unless anyone else objects?
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>

Best Regards,
J.

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