linux-kernel - [PATCH v1 08/28] leds: lgm-sso: Put fwnode in any case during ->probe()

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Date:   Mon, 10 May 2021 12:50:25 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Pavel Machek <pavel@....cz>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Amireddy Mallikarjuna reddy 
        <mallikarjunax.reddy@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Marek Behún <marek.behun@....cz>,
        Abanoub Sameh <abanoubsameh8@...il.com>,
        Dan Murphy <dmurphy@...com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH v1 08/28] leds: lgm-sso: Put fwnode in any case during ->probe()

fwnode_get_next_child_node() bumps a reference counting of a returned variable.
We have to balance it whenever we return to the caller.

All the same in fwnode_for_each_child_node() case.

Fixes: c3987cd2bca3 ("leds: lgm: Add LED controller driver for LGM SoC")
Cc: Amireddy Mallikarjuna reddy <mallikarjunax.reddy@...ux.intel.com>
Signed-off-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
 drivers/leds/blink/leds-lgm-sso.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/leds/blink/leds-lgm-sso.c b/drivers/leds/blink/leds-lgm-sso.c
index 6a6d75f07af0..f6c7a5d0c2f7 100644
--- a/drivers/leds/blink/leds-lgm-sso.c
+++ b/drivers/leds/blink/leds-lgm-sso.c
@@ -633,8 +633,10 @@ __sso_led_dt_parse(struct sso_led_priv *priv, struct fwnode_handle *fw_ssoled)
 
 	fwnode_for_each_child_node(fw_ssoled, fwnode_child) {
 		led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
-		if (!led)
-			return -ENOMEM;
+		if (!led) {
+			ret = -ENOMEM;
+			goto __dt_err;
+		}
 
 		INIT_LIST_HEAD(&led->list);
 		led->priv = priv;
@@ -704,11 +706,11 @@ __sso_led_dt_parse(struct sso_led_priv *priv, struct fwnode_handle *fw_ssoled)
 		if (sso_create_led(priv, led, fwnode_child))
 			goto __dt_err;
 	}
-	fwnode_handle_put(fw_ssoled);
 
 	return 0;
+
 __dt_err:
-	fwnode_handle_put(fw_ssoled);
+	fwnode_handle_put(fwnode_child);
 	/* unregister leds */
 	list_for_each(p, &priv->led_list) {
 		led = list_entry(p, struct sso_led, list);
@@ -734,10 +736,15 @@ static int sso_led_dt_parse(struct sso_led_priv *priv)
 	if (fw_ssoled) {
 		ret = __sso_led_dt_parse(priv, fw_ssoled);
 		if (ret)
-			return ret;
+			goto err_child_out;
 	}
 
+	fwnode_handle_put(fw_ssoled);
 	return 0;
+
+err_child_out:
+	fwnode_handle_put(fw_ssoled);
+	return ret;
 }
 
 static int sso_probe_gpios(struct sso_led_priv *priv)
-- 
2.31.1