Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1434582 > unrolled thread

[PATCH 1/6] hwmon: (lm90) Use devm_add_action for cleanup

Back to article view | Back to linux.kernel

Contents

  [PATCH 1/6] hwmon: (lm90) Use devm_add_action for cleanup Guenter Roeck <linux@roeck-us.net> - 2016-06-30 16:00 +0200
    [PATCH 2/6] hwmon: (lm90) Use devm_hwmon_device_register_with_groups Guenter Roeck <linux@roeck-us.net> - 2016-06-30 16:00 +0200

#1434582 — [PATCH 1/6] hwmon: (lm90) Use devm_add_action for cleanup

Use devm_add_action where possible to simplify error handling and
cleanup on remove.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/hwmon/lm90.c | 40 ++++++++++++++++++++++------------------
 1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index e30a5939dc0d..4b530ef731aa 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -369,7 +369,6 @@ struct lm90_data {
 	struct device *hwmon_dev;
 	const struct attribute_group *groups[6];
 	struct mutex update_lock;
-	struct regulator *regulator;
 	char valid; /* zero until following fields are valid */
 	unsigned long last_updated; /* in jiffies */
 	int kind;
@@ -1404,8 +1403,11 @@ static int lm90_detect(struct i2c_client *client,
 	return 0;
 }
 
-static void lm90_restore_conf(struct i2c_client *client, struct lm90_data *data)
+static void lm90_restore_conf(void *_data)
 {
+	struct lm90_data *data = _data;
+	struct i2c_client *client = data->client;
+
 	/* Restore initial configuration */
 	i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
 				  data->convrate_orig);
@@ -1456,6 +1458,8 @@ static void lm90_init_client(struct i2c_client *client, struct lm90_data *data)
 	config &= 0xBF;	/* run */
 	if (config != data->config_orig) /* Only write if changed */
 		i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
+
+	devm_add_action(&client->dev, lm90_restore_conf, data);
 }
 
 static bool lm90_is_tripped(struct i2c_client *client, u16 *status)
@@ -1506,6 +1510,16 @@ static irqreturn_t lm90_irq_thread(int irq, void *dev_id)
 		return IRQ_NONE;
 }
 
+static void lm90_remove_pec(void *dev)
+{
+	device_remove_file(dev, &dev_attr_pec);
+}
+
+static void lm90_regulator_disable(void *regulator)
+{
+	regulator_disable(regulator);
+}
+
 static int lm90_probe(struct i2c_client *client,
 		      const struct i2c_device_id *id)
 {
@@ -1526,6 +1540,8 @@ static int lm90_probe(struct i2c_client *client,
 		return err;
 	}
 
+	devm_add_action(dev, lm90_regulator_disable, regulator);
+
 	data = devm_kzalloc(dev, sizeof(struct lm90_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
@@ -1534,8 +1550,6 @@ static int lm90_probe(struct i2c_client *client,
 	i2c_set_clientdata(client, data);
 	mutex_init(&data->update_lock);
 
-	data->regulator = regulator;
-
 	/* Set the device type */
 	data->kind = id->driver_data;
 	if (data->kind == adm1032) {
@@ -1577,15 +1591,14 @@ static int lm90_probe(struct i2c_client *client,
 	if (client->flags & I2C_CLIENT_PEC) {
 		err = device_create_file(dev, &dev_attr_pec);
 		if (err)
-			goto exit_restore;
+			return err;
+		devm_add_action(dev, lm90_remove_pec, dev);
 	}
 
 	data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
 							    data, data->groups);
-	if (IS_ERR(data->hwmon_dev)) {
-		err = PTR_ERR(data->hwmon_dev);
-		goto exit_remove_pec;
-	}
+	if (IS_ERR(data->hwmon_dev))
+		return PTR_ERR(data->hwmon_dev);
 
 	if (client->irq) {
 		dev_dbg(dev, "IRQ: %d\n", client->irq);
@@ -1603,12 +1616,6 @@ static int lm90_probe(struct i2c_client *client,
 
 exit_unregister:
 	hwmon_device_unregister(data->hwmon_dev);
-exit_remove_pec:
-	device_remove_file(dev, &dev_attr_pec);
-exit_restore:
-	lm90_restore_conf(client, data);
-	regulator_disable(data->regulator);
-
 	return err;
 }
 
@@ -1617,9 +1624,6 @@ static int lm90_remove(struct i2c_client *client)
 	struct lm90_data *data = i2c_get_clientdata(client);
 
 	hwmon_device_unregister(data->hwmon_dev);
-	device_remove_file(&client->dev, &dev_attr_pec);
-	lm90_restore_conf(client, data);
-	regulator_disable(data->regulator);
 
 	return 0;
 }
-- 
2.5.0

[toc] | [next] | [standalone]

#1434591 — [PATCH 2/6] hwmon: (lm90) Use devm_hwmon_device_register_with_groups

Since all other cleanup handled with devm_add_action, we can use
devm_hwmon_device_register_with_groups() to register the hwmon
device, and drop the remove function.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/hwmon/lm90.c | 26 ++++++--------------------
 1 file changed, 6 insertions(+), 20 deletions(-)

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 4b530ef731aa..9d733cb0504c 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -366,7 +366,6 @@ enum lm90_temp11_reg_index {
 
 struct lm90_data {
 	struct i2c_client *client;
-	struct device *hwmon_dev;
 	const struct attribute_group *groups[6];
 	struct mutex update_lock;
 	char valid; /* zero until following fields are valid */
@@ -1527,6 +1526,7 @@ static int lm90_probe(struct i2c_client *client,
 	struct i2c_adapter *adapter = to_i2c_adapter(dev->parent);
 	struct lm90_data *data;
 	struct regulator *regulator;
+	struct device *hwmon_dev;
 	int groups = 0;
 	int err;
 
@@ -1595,10 +1595,10 @@ static int lm90_probe(struct i2c_client *client,
 		devm_add_action(dev, lm90_remove_pec, dev);
 	}
 
-	data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
-							    data, data->groups);
-	if (IS_ERR(data->hwmon_dev))
-		return PTR_ERR(data->hwmon_dev);
+	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+							   data, data->groups);
+	if (IS_ERR(hwmon_dev))
+		return PTR_ERR(hwmon_dev);
 
 	if (client->irq) {
 		dev_dbg(dev, "IRQ: %d\n", client->irq);
@@ -1608,24 +1608,11 @@ static int lm90_probe(struct i2c_client *client,
 						"lm90", client);
 		if (err < 0) {
 			dev_err(dev, "cannot request IRQ %d\n", client->irq);
-			goto exit_unregister;
+			return err;
 		}
 	}
 
 	return 0;
-
-exit_unregister:
-	hwmon_device_unregister(data->hwmon_dev);
-	return err;
-}
-
-static int lm90_remove(struct i2c_client *client)
-{
-	struct lm90_data *data = i2c_get_clientdata(client);
-
-	hwmon_device_unregister(data->hwmon_dev);
-
-	return 0;
 }
 
 static void lm90_alert(struct i2c_client *client, unsigned int flag)
@@ -1659,7 +1646,6 @@ static struct i2c_driver lm90_driver = {
 		.name	= "lm90",
 	},
 	.probe		= lm90_probe,
-	.remove		= lm90_remove,
 	.alert		= lm90_alert,
 	.id_table	= lm90_id,
 	.detect		= lm90_detect,
-- 
2.5.0

[toc] | [prev] | [standalone]

Back to top | Article view | linux.kernel

csiph-web