linux-kernel - [PATCH v1 1/1] hwmon: (ltc2992) Put fwnode in error case during ->probe()

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Date:   Mon, 10 May 2021 13:01:36 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jean Delvare <jdelvare@...e.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH v1 1/1] hwmon: (ltc2992) Put fwnode in error case during ->probe()

In each iteration fwnode_for_each_available_child_node() bumps a reference
counting of a loop variable followed by dropping in on a next iteration,

Since in error case the loop is broken, we have to drop a reference count
by ourselves. Do it for port_fwnode in error case during ->probe().

Fixes: b0bd407e94b0 ("hwmon: (ltc2992) Add support")
Cc: Alexandru Tachici <alexandru.tachici@...log.com>
Signed-off-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
 drivers/hwmon/ltc2992.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/ltc2992.c b/drivers/hwmon/ltc2992.c
index 4382105bf142..2a4bed0ab226 100644
--- a/drivers/hwmon/ltc2992.c
+++ b/drivers/hwmon/ltc2992.c
@@ -900,11 +900,15 @@ static int ltc2992_parse_dt(struct ltc2992_state *st)
 
 	fwnode_for_each_available_child_node(fwnode, child) {
 		ret = fwnode_property_read_u32(child, "reg", &addr);
-		if (ret < 0)
+		if (ret < 0) {
+			fwnode_handle_put(child);
 			return ret;
+		}
 
-		if (addr > 1)
+		if (addr > 1) {
+			fwnode_handle_put(child);
 			return -EINVAL;
+		}
 
 		ret = fwnode_property_read_u32(child, "shunt-resistor-micro-ohms", &val);
 		if (!ret)
-- 
2.31.1