linux-kernel - Re: [PATCH v2] power: supply: rk817: Fix unsigned comparison with less than zero

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Date:   Thu, 15 Dec 2022 13:04:14 -0600
From:   Chris Morgan <macroalpha82@...il.com>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     sre@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Abaci Robot <abaci@...ux.alibaba.com>
Subject: Re: [PATCH v2] power: supply: rk817: Fix unsigned comparison with
 less than zero

On Wed, Dec 14, 2022 at 11:23:16AM +0800, Jiapeng Chong wrote:
> The tmp is defined as u32 type, which results in invalid processing of
> tmp<0 in function rk817_read_or_set_full_charge_on_boot(). Therefore,
> drop the comparison.
> 
> drivers/power/supply/rk817_charger.c:828 rk817_read_or_set_full_charge_on_boot() warn: unsigned 'tmp' is never less than zero.
> drivers/power/supply/rk817_charger.c:788 rk817_read_or_set_full_charge_on_boot() warn: unsigned 'tmp' is never less than zero.
> 
> Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3444
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>

Looks good to me, thank you.

Tested-by: Chris Morgan <macromorgan@...mail.com>

> ---
> Changes in v2:
>   -Drop the comparison 'tmp<0'.
> 
>  drivers/power/supply/rk817_charger.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/power/supply/rk817_charger.c b/drivers/power/supply/rk817_charger.c
> index 4f9c1c417916..36f807b5ec44 100644
> --- a/drivers/power/supply/rk817_charger.c
> +++ b/drivers/power/supply/rk817_charger.c
> @@ -785,8 +785,6 @@ rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger,
>  		regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
>  				 bulk_reg, 4);
>  		tmp = get_unaligned_be32(bulk_reg);
> -		if (tmp < 0)
> -			tmp = 0;
>  		boot_charge_mah = ADC_TO_CHARGE_UAH(tmp,
>  						    charger->res_div) / 1000;
>  		/*
> @@ -825,8 +823,6 @@ rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger,
>  	regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
>  			 bulk_reg, 4);
>  	tmp = get_unaligned_be32(bulk_reg);
> -	if (tmp < 0)
> -		tmp = 0;
>  	boot_charge_mah = ADC_TO_CHARGE_UAH(tmp, charger->res_div) / 1000;
>  	regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_OCV_VOL_H,
>  			 bulk_reg, 2);
> -- 
> 2.20.1.7.g153144c
>