linux-kernel - Re: [PATCH] ASoC: codecs: aw88261: avoid uninitialized variable warning

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Date:   Tue, 8 Aug 2023 08:00:34 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Weidong Wang <wangweidong.a@...nic.com>,
        Arnd Bergmann <arnd@...db.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: codecs: aw88261: avoid uninitialized variable
 warning

On Tue, Aug 08, 2023 at 02:56:54PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> aw88261_reg_update() returns an unintialized error code in the
> success path:
> 
> sound/soc/codecs/aw88261.c:651:7: error: variable 'ret' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
>                 if (aw_dev->prof_cur != aw_dev->prof_index) {
>                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> sound/soc/codecs/aw88261.c:660:9: note: uninitialized use occurs here
>         return ret;
>                ^~~
> sound/soc/codecs/aw88261.c:651:3: note: remove the 'if' if its condition is always true
>                 if (aw_dev->prof_cur != aw_dev->prof_index) {
>                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Return zero instead here.
> 
> Fixes: 028a2ae256916 ("ASoC: codecs: Add aw88261 amplifier driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Alternatively, it seems like the final 'return ret' can just be replaced
with 'return 0', as every other assignment of ret returns directly if it
is not zero. Regardless:

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

> ---
>  sound/soc/codecs/aw88261.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/sound/soc/codecs/aw88261.c b/sound/soc/codecs/aw88261.c
> index 82923b454dd47..6e2266b713862 100644
> --- a/sound/soc/codecs/aw88261.c
> +++ b/sound/soc/codecs/aw88261.c
> @@ -652,6 +652,8 @@ static int aw88261_reg_update(struct aw88261 *aw88261, bool force)
>  			ret = aw88261_dev_fw_update(aw88261);
>  			if (ret)
>  				return ret;
> +		} else {
> +			ret = 0;
>  		}
>  	}
>  
> -- 
> 2.39.2
>