linux-kernel - Re: [PATCH][V2] leds: TI LMU: fix u8 variable comparisons with less than zero

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Date:   Wed, 22 May 2019 22:48:44 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        linux-leds@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V2] leds: TI LMU: fix u8 variable comparisons with less
 than zero

Hi Colin,

Thank you for the patch.

On 5/22/19 12:17 PM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The u8 variables ramp_ups and ramp_downs are being compared to less
> than zero, this will always be false.  Fix this by making the ramp
> variables ints.
> 
> Addresses-Coverity: ("Unsigned compared against 0")
> Fixes: 9a8e66ebeaa2 ("leds: TI LMU: Add common code for TI LMU devices")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
> 
> V2: make u8 vars ints rather than removing the comparison. Thanks once
> more to Dan Carpenter for spotting my clearly stupid V1 version and
> correcting my mistake.
> 
> ---
>   drivers/leds/leds-ti-lmu-common.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/leds-ti-lmu-common.c b/drivers/leds/leds-ti-lmu-common.c
> index adc7293004f1..c9ab40d5a6ba 100644
> --- a/drivers/leds/leds-ti-lmu-common.c
> +++ b/drivers/leds/leds-ti-lmu-common.c
> @@ -84,7 +84,7 @@ static int ti_lmu_common_convert_ramp_to_index(unsigned int usec)
>   int ti_lmu_common_set_ramp(struct ti_lmu_bank *lmu_bank)
>   {
>   	struct regmap *regmap = lmu_bank->regmap;
> -	u8 ramp, ramp_up, ramp_down;
> +	int ramp, ramp_up, ramp_down;
>   
>   	if (lmu_bank->ramp_up_usec == 0 && lmu_bank->ramp_down_usec == 0) {
>   		ramp_up = 0;
> 

Applied.

-- 
Best regards,
Jacek Anaszewski