extcon: arizona: unlock mutex on error path in arizona_micdet()

If regmap_read() failed, arizona_micdet() returns IRQ_NONE
leaving &info->lock mutex locked as opposed to all other return paths.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index cdab9e5..d876a54 100644 (file)
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -166,6 +166,7 @@ static irqreturn_t arizona_micdet(int irq, void *data)
        ret = regmap_read(arizona->regmap, ARIZONA_MIC_DETECT_3, &val);
        if (ret != 0) {
                dev_err(arizona->dev, "Failed to read MICDET: %d\n", ret);
+               mutex_unlock(&info->lock);
                return IRQ_NONE;
        }