From: Axel Lin <axel.lin@ingics.com>
Date: Mon, 19 Aug 2013 02:07:46 +0000 (+0800)
Subject: pinctrl: core: Add proper mutex lock in pinctrl_request_gpio
X-Git-Tag: v3.12-rc1~151^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b77ace409e1419c331209c4c8eb2c8bc990e9fd;p=pandora-kernel.git

pinctrl: core: Add proper mutex lock in pinctrl_request_gpio

This one is missed in commit 42fed7ba "pinctrl: move subsystem mutex to
pinctrl_dev struct".

I think this fixes the race between pin_free() and pin_request() calls.
It protects accessing the members of pctldev->desc.
(e.g. update desc->mux_usecount, desc->gpio_owner, desc->mux_owner, etc)
Current code grabs pctldev->mutex before calling pinmux_free_gpio(),
but did not grab the mutex while calling pinmux_request_gpio().

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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