[PATCH] hwmon: (iio_hwmon) Use devm functions

["Maxime Roussin-Bélanger" <maxime.roussinbelanger@gmail.com>]

Use devm_iio_channel_get_all() to automatically release
channels.

Use devm_hwmon_device_register_with_groups() to
automatically unregister the device.

Signed-off-by: Maxime Roussin-Bélanger <maxime.roussinbelanger@gmail.com>
---
 drivers/hwmon/iio_hwmon.c | 43 ++++++++++-----------------------------
 1 file changed, 11 insertions(+), 32 deletions(-)

diff --git a/drivers/hwmon/iio_hwmon.c b/drivers/hwmon/iio_hwmon.c
index 69031a0f7ed2..5cbd87b00ce0 100644
--- a/drivers/hwmon/iio_hwmon.c
+++ b/drivers/hwmon/iio_hwmon.c
@@ -73,17 +73,16 @@ static int iio_hwmon_probe(struct platform_device *pdev)
 	if (dev->of_node && dev->of_node->name)
 		name = dev->of_node->name;
 
-	channels = iio_channel_get_all(dev);
+	channels = devm_iio_channel_get_all(dev);
 	if (IS_ERR(channels)) {
 		if (PTR_ERR(channels) == -ENODEV)
 			return -EPROBE_DEFER;
 		return PTR_ERR(channels);
 	}
 
 	st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
 	if (st == NULL) {
-		ret = -ENOMEM;
-		goto error_release_channels;
+		return -ENOMEM;
 	}
 
 	st->channels = channels;
@@ -96,21 +95,19 @@ static int iio_hwmon_probe(struct platform_device *pdev)
 				 st->num_channels + 1, sizeof(*st->attrs),
 				 GFP_KERNEL);
 	if (st->attrs == NULL) {
-		ret = -ENOMEM;
-		goto error_release_channels;
+		return -ENOMEM;
 	}
 
 	for (i = 0; i < st->num_channels; i++) {
 		a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL);
 		if (a == NULL) {
-			ret = -ENOMEM;
-			goto error_release_channels;
+			return -ENOMEM;
 		}
 
 		sysfs_attr_init(&a->dev_attr.attr);
 		ret = iio_get_channel_type(&st->channels[i], &type);
 		if (ret < 0)
-			goto error_release_channels;
+			return ret;
 
 		switch (type) {
 		case IIO_VOLTAGE:
@@ -134,12 +131,10 @@ static int iio_hwmon_probe(struct platform_device *pdev)
 							       humidity_i++);
 			break;
 		default:
-			ret = -EINVAL;
-			goto error_release_channels;
+			return -EINVAL;
 		}
 		if (a->dev_attr.attr.name == NULL) {
-			ret = -ENOMEM;
-			goto error_release_channels;
+			return -ENOMEM;
 		}
 		a->dev_attr.show = iio_hwmon_read_val;
 		a->dev_attr.attr.mode = S_IRUGO;
@@ -152,31 +147,16 @@ static int iio_hwmon_probe(struct platform_device *pdev)
 
 	sname = devm_kstrdup(dev, name, GFP_KERNEL);
 	if (!sname) {
-		ret = -ENOMEM;
-		goto error_release_channels;
+		return -ENOMEM;
 	}
 
 	strreplace(sname, '-', '_');
-	st->hwmon_dev = hwmon_device_register_with_groups(dev, sname, st,
-							  st->groups);
+	st->hwmon_dev = devm_hwmon_device_register_with_groups(dev, sname, st,
+							       st->groups);
 	if (IS_ERR(st->hwmon_dev)) {
-		ret = PTR_ERR(st->hwmon_dev);
-		goto error_release_channels;
+		return PTR_ERR(st->hwmon_dev);
 	}
 	platform_set_drvdata(pdev, st);
-	return 0;
-
-error_release_channels:
-	iio_channel_release_all(channels);
-	return ret;
-}
-
-static int iio_hwmon_remove(struct platform_device *pdev)
-{
-	struct iio_hwmon_state *st = platform_get_drvdata(pdev);
-
-	hwmon_device_unregister(st->hwmon_dev);
-	iio_channel_release_all(st->channels);
 
 	return 0;
 }
@@ -193,7 +173,6 @@ static struct platform_driver __refdata iio_hwmon_driver = {
 		.of_match_table = iio_hwmon_of_match,
 	},
 	.probe = iio_hwmon_probe,
-	.remove = iio_hwmon_remove,
 };
 
 module_platform_driver(iio_hwmon_driver);
-- 
2.18.0