From 96d16c3088a924a44175d2923cc0eafa0d8bbecc Mon Sep 17 00:00:00 2001
From: Francesco VIRLINZI <francesco.virlinzi@st.com>
Date: Mon, 5 Jan 2015 11:04:13 +0100
Subject: [PATCH] pinctrl: st: avoid multiple mutex lock

Using the sysfs inteface to inspect the pins configuration
the system can walk around a path which acquires the same
mutex twice.

On STiH407 platform, for example :
cat /sys/kernel/debug/pinctrl/920f080.pin-controller-front0/pinconf-pins
hangs the kernel and never returns.

With this patch the mutex is temporary freed.

Signed-off-by: Francesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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