linux-kernel - Re: [PATCH] Staging: leds: replace divide condition 'shift / 16' with 'shift >= 16'

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Message-ID: <20241009133643.GI276481@google.com>
Date: Wed, 9 Oct 2024 14:37:52 +0100
From: Lee Jones <lee@...nel.org>
To: Dipendra Khadka <kdipendra88@...il.com>
Cc: avel@....cz, lee@...nel.org, linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Staging: leds: replace divide condition 'shift / 16'
 with 'shift >= 16'

Staging!  Why Staging?

On Sun, 22 Sep 2024, Dipendra Khadka wrote:

> Smatch reported following:
> '''
> drivers/leds/leds-bcm6328.c:116 bcm6328_led_mode() warn: replace divide condition 'shift / 16' with 'shift >= 16'
> drivers/leds/leds-bcm6328.c:360 bcm6328_led() warn: replace divide condition 'shift / 16' with 'shift >= 16'
> '''
> Replacing 'shift / 16' with 'shift >= 16'.

More info please.

- What is the current problem you're attempting to solve?
- How does this patch help with that?
- What are the consequences for not applying this fix?

> Signed-off-by: Dipendra Khadka <kdipendra88@...il.com>
> ---
>  drivers/leds/leds-bcm6328.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/leds/leds-bcm6328.c b/drivers/leds/leds-bcm6328.c
> index 246f1296ab09..13f535ccba0b 100644
> --- a/drivers/leds/leds-bcm6328.c
> +++ b/drivers/leds/leds-bcm6328.c
> @@ -113,7 +113,7 @@ static void bcm6328_led_mode(struct bcm6328_led *led, unsigned long value)
>  	unsigned long val, shift;
>  
>  	shift = bcm6328_pin2shift(led->pin);
> -	if (shift / 16)
> +	if (shift >= 16)
>  		mode = led->mem + BCM6328_REG_MODE_HI;
>  	else
>  		mode = led->mem + BCM6328_REG_MODE_LO;
> @@ -357,7 +357,7 @@ static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg,
>  		break;
>  	case LEDS_DEFSTATE_KEEP:
>  		shift = bcm6328_pin2shift(led->pin);
> -		if (shift / 16)
> +		if (shift >= 16)
>  			mode = mem + BCM6328_REG_MODE_HI;
>  		else
>  			mode = mem + BCM6328_REG_MODE_LO;
> -- 
> 2.43.0
> 
> 

-- 
Lee Jones [李琼斯]