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SubjectRe: [PATCH] leds: ti-lmu-common: Fix coccinelle issue in TI LMU
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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@ti.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

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