[PATCH 2/2] hwmon: (asus_atk0110) Make use of device managed memory

[Bastian Germann]

Use devm_* variants of kstrdup and kzalloc. Get rid of the kfree cleanups.

Signed-off-by: Bastian Germann <bastiangermann@xxxxxxxxxxx>
---
 drivers/hwmon/asus_atk0110.c | 54 +++++++-----------------------------
 1 file changed, 10 insertions(+), 44 deletions(-)

diff --git a/drivers/hwmon/asus_atk0110.c b/drivers/hwmon/asus_atk0110.c
index 33748cc07acc..8bf097bf6f24 100644
--- a/drivers/hwmon/asus_atk0110.c
+++ b/drivers/hwmon/asus_atk0110.c
@@ -190,7 +190,6 @@ static int atk_add(struct acpi_device *device);
 static int atk_remove(struct acpi_device *device);
 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
-static void atk_free_sensors(struct atk_data *data);
 
 static struct acpi_driver atk_driver = {
 	.name	= ATK_HID,
@@ -722,6 +721,7 @@ static void atk_pack_print(char *buf, size_t sz, union acpi_object *pack)
 static int atk_debugfs_ggrp_open(struct inode *inode, struct file *file)
 {
 	struct atk_data *data = inode->i_private;
+	struct device *dev = &data->acpi_dev->dev;
 	char *buf = NULL;
 	union acpi_object *ret;
 	u8 cls;
@@ -748,7 +748,7 @@ static int atk_debugfs_ggrp_open(struct inode *inode, struct file *file)
 		id = &pack->package.elements[0];
 		if (id->integer.value == data->debugfs.id) {
 			/* Print the package */
-			buf = kzalloc(512, GFP_KERNEL);
+			buf = devm_kzalloc(dev, 512, GFP_KERNEL);
 			if (!buf) {
 				ACPI_FREE(ret);
 				return -ENOMEM;
@@ -776,16 +776,9 @@ static ssize_t atk_debugfs_ggrp_read(struct file *file, char __user *buf,
 	return simple_read_from_buffer(buf, count, pos, str, len);
 }
 
-static int atk_debugfs_ggrp_release(struct inode *inode, struct file *file)
-{
-	kfree(file->private_data);
-	return 0;
-}
-
 static const struct file_operations atk_debugfs_ggrp_fops = {
 	.read		= atk_debugfs_ggrp_read,
 	.open		= atk_debugfs_ggrp_open,
-	.release	= atk_debugfs_ggrp_release,
 	.llseek		= no_llseek,
 };
 
@@ -906,15 +899,13 @@ static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
 	limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
 	limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
 
-	sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
+	sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
 	if (!sensor)
 		return -ENOMEM;
 
-	sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
-	if (!sensor->acpi_name) {
-		err = -ENOMEM;
-		goto out;
-	}
+	sensor->acpi_name = devm_kstrdup(dev, name->string.pointer, GFP_KERNEL);
+	if (!sensor->acpi_name)
+		return -ENOMEM;
 
 	INIT_LIST_HEAD(&sensor->list);
 	sensor->type = type;
@@ -955,9 +946,6 @@ static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
 	(*num)++;
 
 	return 1;
-out:
-	kfree(sensor);
-	return err;
 }
 
 static int atk_enumerate_old_hwmon(struct atk_data *data)
@@ -998,8 +986,7 @@ static int atk_enumerate_old_hwmon(struct atk_data *data)
 		dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
 				acpi_format_exception(status));
 
-		ret = -ENODEV;
-		goto cleanup;
+		return -ENODEV;
 	}
 
 	pack = buf.pointer;
@@ -1020,8 +1007,7 @@ static int atk_enumerate_old_hwmon(struct atk_data *data)
 		dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
 				acpi_format_exception(status));
 
-		ret = -ENODEV;
-		goto cleanup;
+		return -ENODEV;
 	}
 
 	pack = buf.pointer;
@@ -1035,9 +1021,6 @@ static int atk_enumerate_old_hwmon(struct atk_data *data)
 	ACPI_FREE(buf.pointer);
 
 	return count;
-cleanup:
-	atk_free_sensors(data);
-	return ret;
 }
 
 static int atk_ec_present(struct atk_data *data)
@@ -1213,17 +1196,6 @@ static int atk_init_attribute_groups(struct atk_data *data)
 	return 0;
 }
 
-static void atk_free_sensors(struct atk_data *data)
-{
-	struct list_head *head = &data->sensor_list;
-	struct atk_sensor_data *s, *tmp;
-
-	list_for_each_entry_safe(s, tmp, head, list) {
-		kfree(s->acpi_name);
-		kfree(s);
-	}
-}
-
 static int atk_register_hwmon(struct atk_data *data)
 {
 	struct device *dev = &data->acpi_dev->dev;
@@ -1323,7 +1295,7 @@ static int atk_add(struct acpi_device *device)
 
 	dev_dbg(&device->dev, "adding...\n");
 
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	data = devm_kzalloc(&device->dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
@@ -1375,18 +1347,15 @@ static int atk_add(struct acpi_device *device)
 		goto out;
 	err = atk_register_hwmon(data);
 	if (err)
-		goto cleanup;
+		goto out;
 
 	atk_debugfs_init(data);
 
 	device->driver_data = data;
 	return 0;
-cleanup:
-	atk_free_sensors(data);
 out:
 	if (data->disable_ec)
 		atk_ec_ctl(data, 0);
-	kfree(data);
 	return err;
 }
 
@@ -1399,7 +1368,6 @@ static int atk_remove(struct acpi_device *device)
 
 	atk_debugfs_cleanup(data);
 
-	atk_free_sensors(data);
 	hwmon_device_unregister(data->hwmon_dev);
 
 	if (data->disable_ec) {
@@ -1407,8 +1375,6 @@ static int atk_remove(struct acpi_device *device)
 			dev_err(&device->dev, "Failed to disable EC\n");
 	}
 
-	kfree(data);
-
 	return 0;
 }
 
-- 
2.17.1