linux-kernel - Re: [PATCH] HID: wacom: Remove comparison of u8 mode with zero and simplify.

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Date:   Sun, 02 Jul 2017 15:04:28 -0700
From:   Joe Perches <joe@...ches.com>
To:     Christos Gkekas <chris.gekas@...il.com>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: wacom: Remove comparison of u8 mode with zero and
 simplify.

On Sun, 2017-07-02 at 22:54 +0100, Christos Gkekas wrote:
> Variable mode in method wacom_show_remote_mode() is defined as u8, thus
> statement (mode >= 0) is always true and should be removed, simplifying
> the logic.
[]
> diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
[]
> @@ -1671,10 +1671,7 @@ static ssize_t wacom_show_remote_mode(struct kobject *kobj,
>  	u8 mode;
>  
>  	mode = wacom->led.groups[index].select;
> -	if (mode >= 0 && mode < 3)
> -		return snprintf(buf, PAGE_SIZE, "%d\n", mode);
> -	else
> -		return snprintf(buf, PAGE_SIZE, "%d\n", -1);
> +	return snprintf(buf, PAGE_SIZE, "%d\n", mode < 3 ? mode : -1);

It's also hard to imagine that PAGE_SIZE could be less than 4 bytes so
	return sprintf(buf, "%d\n", mode < 3 ? mode : -1);
could work too.