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

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Date:   Sun, 2 Jul 2017 23:32:57 +0100
From:   Christos Gkekas <chris.gekas@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     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 02/07/17 15:04:28 -0700, Joe Perches wrote:
> 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.
>
Thanks for the suggestion, makes sense. I will resend the patch.