[PATCH 14/24] Input: ps2-gpio - use guard notation when acquiring mutex

[Dmitry Torokhov]

Using guard notation makes the code more compact and error handling
more robust by ensuring that mutexes are released in all code paths
when control leaves critical section.

Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>
---
 drivers/input/serio/ps2-gpio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/serio/ps2-gpio.c b/drivers/input/serio/ps2-gpio.c
index 0c8b390b8b4f..c9c382989e55 100644
--- a/drivers/input/serio/ps2-gpio.c
+++ b/drivers/input/serio/ps2-gpio.c
@@ -133,12 +133,12 @@ static int ps2_gpio_write(struct serio *serio, unsigned 
char val)
        int ret = 0;
 
        if (in_task()) {
-               mutex_lock(&drvdata->tx.mutex);
+               guard(mutex)(&drvdata->tx.mutex);
+
                __ps2_gpio_write(serio, val);
                if (!wait_for_completion_timeout(&drvdata->tx.complete,
                                                 msecs_to_jiffies(10000)))
                        ret = SERIO_TIMEOUT;
-               mutex_unlock(&drvdata->tx.mutex);
        } else {
                __ps2_gpio_write(serio, val);
        }
-- 
2.46.0.469.g59c65b2a67-goog