tree 03308ef2873f09f6e45e491e0d1e788fa4e99e0e
parent f2dd028c2632d107c26b1daed543d9efd4f0decd
author Francesco VIRLINZI <francesco.virlinzi@st.com> 1420452253 +0100
committer Linus Walleij <linus.walleij@linaro.org> 1420623821 +0100

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>