ACPI: fan: Use platform device for devres-related actions

Device-managed resources are cleaned up when the driver unbinds from
the underlying device. In our case this is the platform device as this
driver is a platform driver. Registering device-managed resources on
the associated ACPI device will thus result in a resource leak when
this driver unbinds.

Ensure that any device-managed resources are only registered on the
platform device to ensure that they are cleaned up during removal.

Fixes: 35c50d8 ("ACPI: fan: Add hwmon support")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Cc: 6.11+ <stable@vger.kernel.org> # 6.11+
Link: https://patch.msgid.link/20251007234149.2769-4-W_Armin@gmx.de
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: Wer-Wolf

drivers/acpi/fan.h

@@ -65,9 +65,9 @@ int acpi_fan_create_attributes(struct acpi_device *device);
 void acpi_fan_delete_attributes(struct acpi_device *device);
 
 #if IS_REACHABLE(CONFIG_HWMON)
-int devm_acpi_fan_create_hwmon(struct acpi_device *device);
+int devm_acpi_fan_create_hwmon(struct device *dev);
 #else
-static inline int devm_acpi_fan_create_hwmon(struct acpi_device *device) { return 0; };
+static inline int devm_acpi_fan_create_hwmon(struct device *dev) { return 0; };
 #endif
 
 #endif

drivers/acpi/fan_core.c

@@ -347,7 +347,7 @@ static int acpi_fan_probe(struct platform_device *pdev)
 	}
 
 	if (fan->has_fst) {
-		result = devm_acpi_fan_create_hwmon(device);
+		result = devm_acpi_fan_create_hwmon(&pdev->dev);
 		if (result)
 			return result;
 

drivers/acpi/fan_hwmon.c

@@ -166,12 +166,12 @@ static const struct hwmon_chip_info acpi_fan_hwmon_chip_info = {
 	.info = acpi_fan_hwmon_info,
 };
 
-int devm_acpi_fan_create_hwmon(struct acpi_device *device)
+int devm_acpi_fan_create_hwmon(struct device *dev)
 {
-	struct acpi_fan *fan = acpi_driver_data(device);
+	struct acpi_fan *fan = dev_get_drvdata(dev);
 	struct device *hdev;
 
-	hdev = devm_hwmon_device_register_with_info(&device->dev, "acpi_fan", fan,
-						    &acpi_fan_hwmon_chip_info, NULL);
+	hdev = devm_hwmon_device_register_with_info(dev, "acpi_fan", fan, &acpi_fan_hwmon_chip_info,
+						    NULL);
 	return PTR_ERR_OR_ZERO(hdev);
 }