hwmon: (pmbus) Don't return errors from driver remove functions

Driver remove functions have an error return value, but rarely return an error
in practice. If a driver does return an error from its remove function, the
driver won't be unloaded and is expected to stay alive.

pmbus_do_remove() is defined as returning an int, but always returns 0 (no
error). Calling code passes that return value on to high level driver
remove functions, but does not evaluate it and removes driver data even if
pmbus_do_remove() returned an error (which it in practice never does). Even if
this code could never cause a real problem, it is nevertheless conceptually
wrong.

To reduce confusion and simplify the code, change pmbus_do_remove() to be a void
function, and have PMBus client drivers always return zero in their driver
remove functions.

Reported-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/pmbus/adm1275.c

@@ -152,11 +152,10 @@ static int adm1275_probe(struct i2c_client *client,
 static int adm1275_remove(struct i2c_client *client)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
-	int ret;
 
-	ret = pmbus_do_remove(client);
+	pmbus_do_remove(client);
 	kfree(info);
-	return ret;
+	return 0;
 }
 
 static const struct i2c_device_id adm1275_id[] = {

drivers/hwmon/pmbus/lm25066.c

@@ -309,11 +309,10 @@ static int lm25066_remove(struct i2c_client *client)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 	const struct lm25066_data *data = to_lm25066_data(info);
-	int ret;
 
-	ret = pmbus_do_remove(client);
+	pmbus_do_remove(client);
 	kfree(data);
-	return ret;
+	return 0;
 }
 
 static const struct i2c_device_id lm25066_id[] = {

drivers/hwmon/pmbus/max16064.c

@@ -105,7 +105,8 @@ static int max16064_probe(struct i2c_client *client,
 
 static int max16064_remove(struct i2c_client *client)
 {
-	return pmbus_do_remove(client);
+	pmbus_do_remove(client);
+	return 0;
 }
 
 static const struct i2c_device_id max16064_id[] = {

drivers/hwmon/pmbus/max34440.c

@@ -224,7 +224,8 @@ static int max34440_probe(struct i2c_client *client,
 
 static int max34440_remove(struct i2c_client *client)
 {
-	return pmbus_do_remove(client);
+	pmbus_do_remove(client);
+	return 0;
 }
 
 static const struct i2c_device_id max34440_id[] = {

drivers/hwmon/pmbus/max8688.c

@@ -182,7 +182,8 @@ static int max8688_probe(struct i2c_client *client,
 
 static int max8688_remove(struct i2c_client *client)
 {
-	return pmbus_do_remove(client);
+	pmbus_do_remove(client);
+	return 0;
 }
 
 static const struct i2c_device_id max8688_id[] = {

drivers/hwmon/pmbus/pmbus.c

@@ -187,13 +187,12 @@ static int pmbus_probe(struct i2c_client *client,
 
 static int pmbus_remove(struct i2c_client *client)
 {
-	int ret;
 	const struct pmbus_driver_info *info;
 
 	info = pmbus_get_driver_info(client);
-	ret = pmbus_do_remove(client);
+	pmbus_do_remove(client);
 	kfree(info);
-	return ret;
+	return 0;
 }
 
 /*

drivers/hwmon/pmbus/pmbus.h

@@ -361,7 +361,7 @@ bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg);
 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg);
 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
 		   struct pmbus_driver_info *info);
-int pmbus_do_remove(struct i2c_client *client);
+void pmbus_do_remove(struct i2c_client *client);
 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client
 						      *client);
 

drivers/hwmon/pmbus/pmbus_core.c

@@ -1764,7 +1764,7 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
 }
 EXPORT_SYMBOL_GPL(pmbus_do_probe);
 
-int pmbus_do_remove(struct i2c_client *client)
+void pmbus_do_remove(struct i2c_client *client)
 {
 	struct pmbus_data *data = i2c_get_clientdata(client);
 	hwmon_device_unregister(data->hwmon_dev);
@@ -1774,7 +1774,6 @@ int pmbus_do_remove(struct i2c_client *client)
 	kfree(data->booleans);
 	kfree(data->sensors);
 	kfree(data);
-	return 0;
 }
 EXPORT_SYMBOL_GPL(pmbus_do_remove);
 

drivers/hwmon/pmbus/ucd9000.c

@@ -239,13 +239,12 @@ static int ucd9000_probe(struct i2c_client *client,
 
 static int ucd9000_remove(struct i2c_client *client)
 {
-	int ret;
 	struct ucd9000_data *data;
 
 	data = to_ucd9000_data(pmbus_get_driver_info(client));
-	ret = pmbus_do_remove(client);
+	pmbus_do_remove(client);
 	kfree(data);
-	return ret;
+	return 0;
 }
 
 

drivers/hwmon/pmbus/ucd9200.c

@@ -171,13 +171,12 @@ static int ucd9200_probe(struct i2c_client *client,
 
 static int ucd9200_remove(struct i2c_client *client)
 {
-	int ret;
 	const struct pmbus_driver_info *info;
 
 	info = pmbus_get_driver_info(client);
-	ret = pmbus_do_remove(client);
+	pmbus_do_remove(client);
 	kfree(info);
-	return ret;
+	return 0;
 }