linux-kernel - Re: [PATCH] leds: ti-lmu-common: Fix coccinelle issue in TI LMU

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Message-ID: <4a1872e8-89a5-4bc4-6aa4-bcadbc48697a@gmail.com>
Date:   Sat, 24 Aug 2019 17:18:43 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Dan Murphy <dmurphy@...com>, pavel@....cz
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds: ti-lmu-common: Fix coccinelle issue in TI LMU

Hi Dan,

Thank you for the patch.

On 8/23/19 9:55 PM, Dan Murphy wrote:
> Fix the coccinelle issues found in the TI LMU common code
> 
> drivers/leds/leds-ti-lmu-common.c:97:20-29: WARNING: Unsigned expression compared with zero: ramp_down < 0
> drivers/leds/leds-ti-lmu-common.c:97:5-12: WARNING: Unsigned expression compared with zero: ramp_up < 0

Wouldn't it make more sense to remove those pointless checks?
Clearly a correct index of an array cannot be negative.
Looking at the code I would make more int -> unsigned int conversions:

- ramp_table should be unsigned int
- ti_lmu_common_convert_ramp_to_index should return unsigned int


> Fixes: f717460ba4d7 ("leds: TI LMU: Add common code for TI LMU devices")
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
>  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;
> 

-- 
Best regards,
Jacek Anaszewski