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

[Wentao Liang <vulab@iscas.ac.cn>]

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>
---
 drivers/power/supply/ltc2941-battery-gauge.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/ltc2941-battery-gauge.c b/drivers/power/supply/ltc2941-battery-gauge.c
index a1ddc4b060ce..bf0b268b10bf 100644
--- a/drivers/power/supply/ltc2941-battery-gauge.c
+++ b/drivers/power/supply/ltc2941-battery-gauge.c
@@ -464,9 +464,11 @@ static int ltc294x_i2c_probe(struct i2c_client *client)
 	/* r_sense can be negative, when sense+ is connected to the battery
 	 * instead of the sense-. This results in reversed measurements. */
 	ret = of_property_read_u32(np, "lltc,resistor-sense", &r_sense);
-	if (ret < 0)
+	if (ret < 0) {
+		of_node_put(np);
 		return dev_err_probe(&client->dev, ret,
 			"Could not find lltc,resistor-sense in devicetree\n");
+	}
 	info->r_sense = r_sense;
 
 	ret = of_property_read_u32(np, "lltc,prescaler-exponent",
@@ -477,6 +479,8 @@ 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;
-- 
2.34.1