[PATCH v7 1/3] HID: input: Convert battery code to devm_*

[Lucas Zampieri <lcasmz54@gmail.com>]

Convert the HID battery code to use devm_* managed resource APIs for
the power_supply_desc allocation, battery name string, and power supply
registration.

The error path uses devm_kfree() to clean up allocated memory if
devm_power_supply_register() fails, preventing memory waste on repeated
setup attempts. The hidinput_cleanup_battery() function is removed as
devm handles cleanup automatically.

Signed-off-by: Lucas Zampieri <lcasmz54@gmail.com>
---
 drivers/hid/hid-input.c | 34 +++++++---------------------------
 1 file changed, 7 insertions(+), 27 deletions(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 395138372..7e0f971ef 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -526,13 +526,13 @@ static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 	if (quirks & HID_BATTERY_QUIRK_IGNORE)
 		return 0;
 
-	psy_desc = kzalloc_obj(*psy_desc);
+	psy_desc = devm_kzalloc(&dev->dev, sizeof(*psy_desc), GFP_KERNEL);
 	if (!psy_desc)
 		return -ENOMEM;
 
-	psy_desc->name = kasprintf(GFP_KERNEL, "hid-%s-battery",
-				   strlen(dev->uniq) ?
-					dev->uniq : dev_name(&dev->dev));
+	psy_desc->name = devm_kasprintf(&dev->dev, GFP_KERNEL, "hid-%s-battery",
+					strlen(dev->uniq) ?
+						dev->uniq : dev_name(&dev->dev));
 	if (!psy_desc->name) {
 		error = -ENOMEM;
 		goto err_free_mem;
@@ -574,7 +574,7 @@ static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 
 	dev->battery_present = (quirks & HID_BATTERY_QUIRK_DYNAMIC) ? false : true;
 
-	dev->battery = power_supply_register(&dev->dev, psy_desc, &psy_cfg);
+	dev->battery = devm_power_supply_register(&dev->dev, psy_desc, &psy_cfg);
 	if (IS_ERR(dev->battery)) {
 		error = PTR_ERR(dev->battery);
 		hid_warn(dev, "can't register power supply: %d\n", error);
@@ -585,27 +585,13 @@ static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 	return 0;
 
 err_free_name:
-	kfree(psy_desc->name);
+	devm_kfree(&dev->dev, psy_desc->name);
 err_free_mem:
-	kfree(psy_desc);
+	devm_kfree(&dev->dev, psy_desc);
 	dev->battery = NULL;
 	return error;
 }
 
-static void hidinput_cleanup_battery(struct hid_device *dev)
-{
-	const struct power_supply_desc *psy_desc;
-
-	if (!dev->battery)
-		return;
-
-	psy_desc = dev->battery->desc;
-	power_supply_unregister(dev->battery);
-	kfree(psy_desc->name);
-	kfree(psy_desc);
-	dev->battery = NULL;
-}
-
 static bool hidinput_update_battery_charge_status(struct hid_device *dev,
 						  unsigned int usage, int value)
 {
@@ -660,10 +646,6 @@ static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 	return 0;
 }
 
-static void hidinput_cleanup_battery(struct hid_device *dev)
-{
-}
-
 static void hidinput_update_battery(struct hid_device *dev, unsigned int usage,
 				    int value)
 {
@@ -2393,8 +2375,6 @@ void hidinput_disconnect(struct hid_device *hid)
 {
 	struct hid_input *hidinput, *next;
 
-	hidinput_cleanup_battery(hid);
-
 	list_for_each_entry_safe(hidinput, next, &hid->inputs, list) {
 		list_del(&hidinput->list);
 		if (hidinput->registered)
-- 
2.53.0