From: Francesco VIRLINZI <francesco.virlinzi@st.com>
Date: Mon, 5 Jan 2015 10:04:13 +0000 (+0100)
Subject: pinctrl: st: avoid multiple mutex lock
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~315^2~1
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96d16c3088a924a44175d2923cc0eafa0d8bbecc;p=pandora-kernel.git

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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