hwmon: (tmp401) Reset valid flag when resetting temperature history

Cached data is no longer valid after resetting the temperature history.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/hwmon/tmp401.c b/drivers/hwmon/tmp401.c
index 4d306b29ba71..061146288e41 100644
--- a/drivers/hwmon/tmp401.c
+++ b/drivers/hwmon/tmp401.c
@@ -351,6 +351,8 @@ static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
 static ssize_t reset_temp_history(struct device *dev,
         struct device_attribute *devattr, const char *buf, size_t count)
 {
+        struct i2c_client *client = to_i2c_client(dev);
+        struct tmp401_data *data = i2c_get_clientdata(client);
         long val;
 
         if (kstrtol(buf, 10, &val))
@@ -362,8 +364,10 @@ static ssize_t reset_temp_history(struct device *dev,
                         val);
                 return -EINVAL;
         }
-        i2c_smbus_write_byte_data(to_i2c_client(dev),
-                                  TMP401_TEMP_MSB_WRITE[5][0], val);
+        mutex_lock(&data->update_lock);
+        i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
+        data->valid = 0;
+        mutex_unlock(&data->update_lock);
 
         return count;
 }