[PATCH 5.10.y] power: supply: ltc2941: Fix of_node reference leak in ltc294x_i2c_probe()

[Sasha Levin <sashal@kernel.org>]

From: Wentao Liang <vulab@iscas.ac.cn>

[ Upstream commit 09a29213bf15630e85a375478832b074b2cfc5c8 ]

ltc294x_i2c_probe() takes a reference on the device node with
of_node_get(), but never drops it, so the reference leaks on every
return path, including the success path.

The node is only used to read the battery properties and to set
info->supply_desc.name, so release it after its last use and also on
the lltc,resistor-sense error path.

Fixes: 085bc24d1553 ("Add LTC2941/LTC2943 Battery Gauge Driver")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Link: https://patch.msgid.link/20260917142127.2156568-1-vulab@iscas.ac.cn
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
[ sashal: adjusted error-path context for dev_err() with a separate return instead of dev_err_probe() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/power/supply/ltc2941-battery-gauge.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/power/supply/ltc2941-battery-gauge.c b/drivers/power/supply/ltc2941-battery-gauge.c
index 10cd617516ec2..7a0028c1480a1 100644
--- a/drivers/power/supply/ltc2941-battery-gauge.c
+++ b/drivers/power/supply/ltc2941-battery-gauge.c
@@ -481,6 +481,7 @@ static int ltc294x_i2c_probe(struct i2c_client *client,
 	 * instead of the sense-. This results in reversed measurements. */
 	ret = of_property_read_u32(np, "lltc,resistor-sense", &r_sense);
 	if (ret < 0) {
+		of_node_put(np);
 		dev_err(&client->dev,
 			"Could not find lltc,resistor-sense in devicetree\n");
 		return ret;
@@ -495,6 +496,8 @@ static int ltc294x_i2c_probe(struct i2c_client *client,
 		prescaler_exp = LTC2941_MAX_PRESCALER_EXP;
 	}
 
+	of_node_put(np);
+
 	if (info->id == LTC2943_ID) {
 		if (prescaler_exp > LTC2943_MAX_PRESCALER_EXP)
 			prescaler_exp = LTC2943_MAX_PRESCALER_EXP;
-- 
2.53.0