linux-kernel - Re: [PATCH] backlight: lp855x: Drop ret variable in brightness change function

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Message-ID: <20230815190910.GA2908446@dev-arch.thelio-3990X>
Date:   Tue, 15 Aug 2023 12:09:10 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Artur Weber <aweber.kernel@...il.com>
Cc:     Lee Jones <lee@...nel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Helge Deller <deller@....de>, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] backlight: lp855x: Drop ret variable in brightness
 change function

On Wed, Aug 09, 2023 at 01:42:16PM +0200, Artur Weber wrote:
> Fixes the following warning:
> 
> drivers/video/backlight/lp855x_bl.c:252:7: warning: variable 'ret' is used
> uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
> 
> Signed-off-by: Artur Weber <aweber.kernel@...il.com>
> Fixes: 5145531be5fb ("backlight: lp855x: Catch errors when changing brightness")
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202308091728.NEJhgUPP-lkp@intel.com/

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

> ---
>  drivers/video/backlight/lp855x_bl.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
> index 61a7f45bfad8..da1f124db69c 100644
> --- a/drivers/video/backlight/lp855x_bl.c
> +++ b/drivers/video/backlight/lp855x_bl.c
> @@ -241,19 +241,17 @@ static int lp855x_bl_update_status(struct backlight_device *bl)
>  {
>  	struct lp855x *lp = bl_get_data(bl);
>  	int brightness = bl->props.brightness;
> -	int ret;
>  
>  	if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
>  		brightness = 0;
>  
>  	if (lp->mode == PWM_BASED)
> -		ret = lp855x_pwm_ctrl(lp, brightness,
> +		return lp855x_pwm_ctrl(lp, brightness,
>  				      bl->props.max_brightness);
>  	else if (lp->mode == REGISTER_BASED)
> -		ret = lp855x_write_byte(lp, lp->cfg->reg_brightness,
> +		return lp855x_write_byte(lp, lp->cfg->reg_brightness,
>  					(u8)brightness);
> -
> -	return ret;
> +	return -EINVAL;
>  }
>  
>  static const struct backlight_ops lp855x_bl_ops = {
> 
> base-commit: 21ef7b1e17d039053edaeaf41142423810572741
> -- 
> 2.41.0
>