hwmon: (lm80) Fix missing unlock on error in set_fan_div()

Add the missing unlock before return from function set_fan_div()
in the error handling case.

Fixes: c9c63915519b ("hwmon: (lm80) fix a missing check of the status of SMBus read")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/hwmon/lm80.c b/drivers/hwmon/lm80.c
index 0e30fa00204c..f9b8e3e23a8e 100644
--- a/drivers/hwmon/lm80.c
+++ b/drivers/hwmon/lm80.c
@@ -393,8 +393,10 @@ static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
         }
 
         rv = lm80_read_value(client, LM80_REG_FANDIV);
-        if (rv < 0)
+        if (rv < 0) {
+                mutex_unlock(&data->update_lock);
                 return rv;
+        }
         reg = (rv & ~(3 << (2 * (nr + 1))))
             | (data->fan_div[nr] << (2 * (nr + 1)));
         lm80_write_value(client, LM80_REG_FANDIV, reg);