[PATCH 1/4] hwmon: (sch56xx) Use devres functions for watchdog

[W_Armin@xxxxxx]

From: Armin Wolf <W_Armin@xxxxxx>

Use devm_kzalloc()/devm_watchdog_register() for
watchdog registration since it allows us to remove
the sch56xx_watchdog_data struct from the drivers
own data structs.
Remove sch56xx_watchdog_unregister since devres
takes care of that now.

Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
---
 drivers/hwmon/sch5627.c        | 12 +++---------
 drivers/hwmon/sch5636.c        |  9 ++-------
 drivers/hwmon/sch56xx-common.c | 13 +++----------
 3 files changed, 8 insertions(+), 26 deletions(-)

diff --git a/drivers/hwmon/sch5627.c b/drivers/hwmon/sch5627.c
index 4324a5dbc968..8a71fba33ea0 100644
--- a/drivers/hwmon/sch5627.c
+++ b/drivers/hwmon/sch5627.c
@@ -64,7 +64,6 @@ static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {

 struct sch5627_data {
 	unsigned short addr;
-	struct sch56xx_watchdog_data *watchdog;
 	u8 control;
 	u8 temp_max[SCH5627_NO_TEMPS];
 	u8 temp_crit[SCH5627_NO_TEMPS];
@@ -359,11 +358,6 @@ static const struct hwmon_chip_info sch5627_chip_info = {

 static int sch5627_remove(struct platform_device *pdev)
 {
-	struct sch5627_data *data = platform_get_drvdata(pdev);
-
-	if (data->watchdog)
-		sch56xx_watchdog_unregister(data->watchdog);
-
 	return 0;
 }

@@ -460,9 +454,9 @@ static int sch5627_probe(struct platform_device *pdev)
 		return PTR_ERR(hwmon_dev);

 	/* Note failing to register the watchdog is not a fatal error */
-	data->watchdog = sch56xx_watchdog_register(&pdev->dev, data->addr,
-			(build_code << 24) | (build_id << 8) | hwmon_rev,
-			&data->update_lock, 1);
+	sch56xx_watchdog_register(&pdev->dev, data->addr,
+				  (build_code << 24) | (build_id << 8) | hwmon_rev,
+				  &data->update_lock, 1);

 	return 0;
 }
diff --git a/drivers/hwmon/sch5636.c b/drivers/hwmon/sch5636.c
index 5683a38740f6..a5cd4de36575 100644
--- a/drivers/hwmon/sch5636.c
+++ b/drivers/hwmon/sch5636.c
@@ -54,7 +54,6 @@ static const u16 SCH5636_REG_FAN_VAL[SCH5636_NO_FANS] = {
 struct sch5636_data {
 	unsigned short addr;
 	struct device *hwmon_dev;
-	struct sch56xx_watchdog_data *watchdog;

 	struct mutex update_lock;
 	char valid;			/* !=0 if following fields are valid */
@@ -372,9 +371,6 @@ static int sch5636_remove(struct platform_device *pdev)
 	struct sch5636_data *data = platform_get_drvdata(pdev);
 	int i;

-	if (data->watchdog)
-		sch56xx_watchdog_unregister(data->watchdog);
-
 	if (data->hwmon_dev)
 		hwmon_device_unregister(data->hwmon_dev);

@@ -495,9 +491,8 @@ static int sch5636_probe(struct platform_device *pdev)
 	}

 	/* Note failing to register the watchdog is not a fatal error */
-	data->watchdog = sch56xx_watchdog_register(&pdev->dev, data->addr,
-					(revision[0] << 8) | revision[1],
-					&data->update_lock, 0);
+	sch56xx_watchdog_register(&pdev->dev, data->addr, (revision[0] << 8) | revision[1],
+				  &data->update_lock, 0);

 	return 0;

diff --git a/drivers/hwmon/sch56xx-common.c b/drivers/hwmon/sch56xx-common.c
index 6c84780e358e..9c884fd0beb2 100644
--- a/drivers/hwmon/sch56xx-common.c
+++ b/drivers/hwmon/sch56xx-common.c
@@ -401,7 +401,7 @@ struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
 		return NULL;
 	}

-	data = kzalloc(sizeof(struct sch56xx_watchdog_data), GFP_KERNEL);
+	data = devm_kzalloc(parent, sizeof(struct sch56xx_watchdog_data), GFP_KERNEL);
 	if (!data)
 		return NULL;

@@ -438,10 +438,10 @@ struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
 	data->watchdog_output_enable = output_enable;

 	watchdog_set_drvdata(&data->wddev, data);
-	err = watchdog_register_device(&data->wddev);
+	err = devm_watchdog_register_device(parent, &data->wddev);
 	if (err) {
 		pr_err("Registering watchdog chardev: %d\n", err);
-		kfree(data);
+		devm_kfree(parent, data);
 		return NULL;
 	}

@@ -449,13 +449,6 @@ struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
 }
 EXPORT_SYMBOL(sch56xx_watchdog_register);

-void sch56xx_watchdog_unregister(struct sch56xx_watchdog_data *data)
-{
-	watchdog_unregister_device(&data->wddev);
-	kfree(data);
-}
-EXPORT_SYMBOL(sch56xx_watchdog_unregister);
-
 /*
  * platform dev find, add and remove functions
  */
--
2.20.1