hwmon: (lm80) reset device if error occurred

If an error occurs while updating (e.g. because the chip was
disconnected) the device needs to be reinitialized in order
to get back to 11 bit temperature and set the fan divider.
Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

drivers/hwmon/lm80.c

@@ -108,6 +108,7 @@ static inline long TEMP_FROM_REG(u16 temp)
 struct lm80_data {
 	struct device *hwmon_dev;
 	struct mutex update_lock;
+	char error;		/* !=0 if error occurred during last update */
 	char valid;		/* !=0 if following fields are valid */
 	unsigned long last_updated;	/* In jiffies */
 
@@ -595,6 +596,9 @@ static struct lm80_data *lm80_update_device(struct device *dev)
 
 	mutex_lock(&data->update_lock);
 
+	if (data->error)
+		lm80_init_client(client);
+
 	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 		dev_dbg(&client->dev, "Starting lm80 update\n");
 		for (i = 0; i <= 6; i++) {
@@ -678,12 +682,14 @@ static struct lm80_data *lm80_update_device(struct device *dev)
 
 		data->last_updated = jiffies;
 		data->valid = 1;
+		data->error = 0;
 	}
 	goto done;
 
 abort:
 	ret = ERR_PTR(rv);
 	data->valid = 0;
+	data->error = 1;
 
 done:
 	mutex_unlock(&data->update_lock);