linux-kernel - [PATCH v1 21/28] leds: lm3697: Make error handling more robust

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Date:   Mon, 10 May 2021 12:50:38 +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 21/28] leds: lm3697: Make error handling more robust

It's easy to miss necessary clean up, e.g. firmware node reference counting,
during error path in ->probe(). Make it more robust by moving to a single
point of return.

Signed-off-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
 drivers/leds/leds-lm3697.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/leds/leds-lm3697.c b/drivers/leds/leds-lm3697.c
index 9d35dd2a9bf0..6262ae69591e 100644
--- a/drivers/leds/leds-lm3697.c
+++ b/drivers/leds/leds-lm3697.c
@@ -224,14 +224,12 @@ static int lm3697_probe_dt(struct lm3697 *priv)
 		ret = fwnode_property_read_u32(child, "reg", &control_bank);
 		if (ret) {
 			dev_err(dev, "reg property missing\n");
-			fwnode_handle_put(child);
 			goto child_out;
 		}
 
 		if (control_bank > LM3697_CONTROL_B) {
 			dev_err(dev, "reg property is invalid\n");
 			ret = -EINVAL;
-			fwnode_handle_put(child);
 			goto child_out;
 		}
 
@@ -262,7 +260,6 @@ static int lm3697_probe_dt(struct lm3697 *priv)
 						    led->num_leds);
 		if (ret) {
 			dev_err(dev, "led-sources property missing\n");
-			fwnode_handle_put(child);
 			goto child_out;
 		}
 
@@ -287,7 +284,6 @@ static int lm3697_probe_dt(struct lm3697 *priv)
 						     &init_data);
 		if (ret) {
 			dev_err(dev, "led register err: %d\n", ret);
-			fwnode_handle_put(child);
 			goto child_out;
 		}
 
@@ -295,6 +291,7 @@ static int lm3697_probe_dt(struct lm3697 *priv)
 	}
 
 child_out:
+	fwnode_handle_put(child);
 	return ret;
 }
 
-- 
2.31.1