[PATCH] usb: common: usb-conn-gpio: manage connector ID with devres

[Sang-Hoon Choi <csh0052@gmail.com>]

usb_conn_psy_register() allocates a connector ID, but usb_conn_probe()
does not release it if a later GPIO-to-IRQ conversion or IRQ request
fails. The failed probe therefore leaks the allocated ID.

Manage the ID with a devm action registered before the power supply. This
also makes the ID available only after the power supply has been
unregistered during teardown, avoiding premature reuse of its name.

Fixes: d4e5b10c5562 ("usb: common: usb-conn-gpio: use a unique name for usb connector device")
Reported-by: Changyul Lee <lcy8047@gmail.com>
Assisted-by: LLM
Signed-off-by: Sang-Hoon Choi <csh0052@gmail.com>
---
Compile-tested the affected object with x86_64 allmodconfig
and W=1 (GCC 13.3.0). Base: mainline 3b7cab693ba2bab63774bf5b988e8a61b2ef0f32.
No hardware testing or runtime failure reproduction was performed.

 drivers/usb/common/usb-conn-gpio.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index 421c3af38e06..128ab683f110 100644
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -157,6 +157,13 @@ static int usb_charger_get_property(struct power_supply *psy,
 	return 0;
 }
 
+static void usb_conn_ida_free(void *data)
+{
+	struct usb_conn_info *info = data;
+
+	ida_free(&usb_conn_ida, info->conn_id);
+}
+
 static int usb_conn_psy_register(struct usb_conn_info *info)
 {
 	struct device *dev = info->dev;
@@ -164,17 +171,20 @@ static int usb_conn_psy_register(struct usb_conn_info *info)
 	struct power_supply_config cfg = {
 		.fwnode = dev_fwnode(dev),
 	};
+	int ret;
 
 	info->conn_id = ida_alloc(&usb_conn_ida, GFP_KERNEL);
 	if (info->conn_id < 0)
 		return info->conn_id;
 
+	ret = devm_add_action_or_reset(dev, usb_conn_ida_free, info);
+	if (ret)
+		return ret;
+
 	desc->name = devm_kasprintf(dev, GFP_KERNEL, "usb-charger-%d",
 				    info->conn_id);
-	if (!desc->name) {
-		ida_free(&usb_conn_ida, info->conn_id);
+	if (!desc->name)
 		return -ENOMEM;
-	}
 
 	desc->properties = usb_charger_properties;
 	desc->num_properties = ARRAY_SIZE(usb_charger_properties);
@@ -183,10 +193,8 @@ static int usb_conn_psy_register(struct usb_conn_info *info)
 	cfg.drv_data = info;
 
 	info->charger = devm_power_supply_register(dev, desc, &cfg);
-	if (IS_ERR(info->charger)) {
+	if (IS_ERR(info->charger))
 		dev_err(dev, "Unable to register charger %d\n", info->conn_id);
-		ida_free(&usb_conn_ida, info->conn_id);
-	}
 
 	return PTR_ERR_OR_ZERO(info->charger);
 }
@@ -294,9 +302,6 @@ static void usb_conn_remove(struct platform_device *pdev)
 
 	cancel_delayed_work_sync(&info->dw_det);
 
-	if (info->charger)
-		ida_free(&usb_conn_ida, info->conn_id);
-
 	if (info->last_role == USB_ROLE_HOST && info->vbus)
 		regulator_disable(info->vbus);