linux-kernel - [PATCH -next] leds: trigger: netdev: NULL check before dev

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Message-Id: <20230511070820.52731-1-yang.lee@linux.alibaba.com>
Date:   Thu, 11 May 2023 15:08:20 +0800
From:   Yang Li <yang.lee@...ux.alibaba.com>
To:     pavel@....cz
Cc:     lee@...nel.org, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yang Li <yang.lee@...ux.alibaba.com>,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: [PATCH -next] leds: trigger: netdev: NULL check before dev_{put, hold}

The call netdev_{put, hold} of dev_{put, hold} will check NULL,
so there is no need to check before using dev_{put, hold},
remove it to silence the warnings:

./drivers/leds/trigger/ledtrig-netdev.c:291:3-10: WARNING: NULL check before dev_{put, hold} functions is not needed.
./drivers/leds/trigger/ledtrig-netdev.c:401:2-9: WARNING: NULL check before dev_{put, hold} functions is not needed.

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=4929
Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
---
 drivers/leds/trigger/ledtrig-netdev.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index 305eb543ba84..92de22be5f1c 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -287,8 +287,7 @@ static int netdev_trig_notify(struct notifier_block *nb,
 		trigger_data->carrier_link_up = netif_carrier_ok(dev);
 		fallthrough;
 	case NETDEV_REGISTER:
-		if (trigger_data->net_dev)
-			dev_put(trigger_data->net_dev);
+		dev_put(trigger_data->net_dev);
 		dev_hold(dev);
 		trigger_data->net_dev = dev;
 		break;
@@ -397,8 +396,7 @@ static void netdev_trig_deactivate(struct led_classdev *led_cdev)
 
 	cancel_delayed_work_sync(&trigger_data->work);
 
-	if (trigger_data->net_dev)
-		dev_put(trigger_data->net_dev);
+	dev_put(trigger_data->net_dev);
 
 	kfree(trigger_data);
 }
-- 
2.20.1.7.g153144c