linux-kernel - [PATCH] net: dsa: lan9303: correctly check return value of devm_gpiod_get

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Date:   Sun, 12 Nov 2017 23:38:09 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Pan Bian <bianpan2016@....com>
Subject: [PATCH] net: dsa: lan9303: correctly check return value of devm_gpiod_get_optional

Function devm_gpiod_get_optional() returns an ERR_PTR on failure. Its
return value should not be validated by a NULL check. Instead, use IS_ERR.

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/net/dsa/lan9303-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index b471413..6d3fc8f 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -828,7 +828,7 @@ static void lan9303_probe_reset_gpio(struct lan9303 *chip,
 	chip->reset_gpio = devm_gpiod_get_optional(chip->dev, "reset",
 						   GPIOD_OUT_LOW);
 
-	if (!chip->reset_gpio) {
+	if (IS_ERR(chip->reset_gpio)) {
 		dev_dbg(chip->dev, "No reset GPIO defined\n");
 		return;
 	}
-- 
1.9.1