From: Guenter Roeck <linux@roeck-us.net>
Date: Sun, 14 Apr 2013 11:39:46 +0000 (-0700)
Subject: hwmon: (tmp401) Reset valid flag when resetting temperature history
X-Git-Tag: firefly_0821_release~3680^2~677^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8eb6d90fec24244f80bba018d955413ea6117a34;p=firefly-linux-kernel-4.4.55.git

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Cached data is no longer valid after resetting the temperature history.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

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;
 }