linux-kernel - Re: [PATCH v2] leds: triggers: Check return value of kobject_uevent

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Date:   Mon, 19 Sep 2016 03:19:10 -0700
From:   Joe Perches <joe@...ches.com>
To:     Jacek Anaszewski <j.anaszewski@...sung.com>,
        linux-leds@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, greg@...ah.com
Subject: Re: [PATCH v2] leds: triggers: Check return value of
 kobject_uevent_env()

On Mon, 2016-09-19 at 12:05 +0200, Jacek Anaszewski wrote:
> Log error message if kobject_uevent_env() fails in led_trigger_set().

trivia:

> diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
[]
> @@ -141,7 +141,9 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
>  	if (event) {
>  		envp[0] = event;
>  		envp[1] = NULL;
> -		kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp);
> +		if (kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp))
> +			dev_err(led_cdev->dev,
> +				"led_trigger_set: Error sending uevent\n");

It is generally better to use %s, __func__ than to embed
a function name in the format string.

+			dev_err(led_cdev->dev, "%s: Error sending uevent\n",
+				__func__);

Then Function renaming and code refactoring is less
error prone.