linux-kernel - Re: [PATCH] power: supply: twl4030-charger: remove unused cur

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Date:   Sat, 1 Apr 2023 22:30:26 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Tom Rix <trix@...hat.com>
Cc:     nathan@...nel.org, ndesaulniers@...gle.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Andreas Kemnade <andreas@...nade.info>,
        "H. Nikolaus Schaller" <hns@...delico.com>
Subject: Re: [PATCH] power: supply: twl4030-charger: remove unused cur_reg
 variable

Hi,

On Sat, Apr 01, 2023 at 07:34:32AM -0400, Tom Rix wrote:
> clang with W=1 reports
> drivers/power/supply/twl4030_charger.c:242:16: error: variable
>   'cur_reg' set but not used [-Werror,-Wunused-but-set-variable]
>         unsigned reg, cur_reg;
>                       ^
> This variable is not used so remove it.
> 
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  drivers/power/supply/twl4030_charger.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
> index 7adfd69fe649..5fa5b2311330 100644
> --- a/drivers/power/supply/twl4030_charger.c
> +++ b/drivers/power/supply/twl4030_charger.c
> @@ -239,7 +239,7 @@ static int twl4030_charger_update_current(struct twl4030_bci *bci)
>  {
>  	int status;
>  	int cur;
> -	unsigned reg, cur_reg;
> +	unsigned reg;
>  	u8 bcictl1, oldreg, fullreg;
>  	bool cgain = false;
>  	u8 boot_bci;
> @@ -357,11 +357,9 @@ static int twl4030_charger_update_current(struct twl4030_bci *bci)
>  	status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
>  	if (status < 0)
>  		return status;
> -	cur_reg = oldreg;
>  	status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
>  	if (status < 0)
>  		return status;
> -	cur_reg |= oldreg << 8;
>  	if (reg != oldreg) {

I think the correct fix would be checking for (reg != cur_reg) here.

-- Sebastian

>  		/* disable write protection for one write access for
>  		 * BCIIREF */
> -- 
> 2.27.0
> 

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