iio:adc:at91: Relase mutex on error path in at91_adc_read_raw

This issue was reported by the mini_lock.cocci coccinelle semantic patch.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index 6a084695b77e..f61780a02374 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -349,9 +349,11 @@ static int at91_adc_read_raw(struct iio_dev *idev,
                                                        st->done,
                                                        msecs_to_jiffies(1000));
                 if (ret == 0)
-                        return -ETIMEDOUT;
-                else if (ret < 0)
+                        ret = -ETIMEDOUT;
+                if (ret < 0) {
+                        mutex_unlock(&st->lock);
                         return ret;
+                }
 
                 *val = st->last_value;