linux-kernel - Re: [PATCH v2] ASoC: amd: ps: Fix uninitialized ret in create_acp64_platform

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Date:   Mon, 9 Jan 2023 17:00:11 +0530
From:   syed saba kareem <ssabakar@....com>
To:     Nathan Chancellor <nathan@...nel.org>, lgirdwood@...il.com,
        broonie@...nel.org
Cc:     Syed.SabaKareem@....com, ndesaulniers@...gle.com, trix@...hat.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Vijendar Mukunda <Vijendar.Mukunda@....com>
Subject: Re: [PATCH v2] ASoC: amd: ps: Fix uninitialized ret in
 create_acp64_platform_devs()


On 1/6/23 06:13, Nathan Chancellor wrote:
> Clang warns:
>
>    sound/soc/amd/ps/pci-ps.c:218:2: error: variable 'ret' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
>            default:
>            ^~~~~~~
>    sound/soc/amd/ps/pci-ps.c:239:9: note: uninitialized use occurs here
>            return ret;
>                   ^~~
>    sound/soc/amd/ps/pci-ps.c:190:9: note: initialize the variable 'ret' to silence this warning
>            int ret;
>                   ^
>                    = 0
>    1 error generated.
>
> ret is used uninitialized if 'goto de_init' is taken. As this is not an
> error nor should the ACP be deinitialized, just directly return 0 in
> this case statement, which resolves the warning.
>
> Fixes: 1d325cdaf7a2 ("ASoC: amd: ps: refactor platform device creation logic")
> Link: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FClangBuiltLinux%2Flinux%2Fissues%2F1779&data=05%7C01%7CSyed.SabaKareem%40amd.com%7Cab19d64e997043ee07ae08daef7f10d0%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C638085626264112039%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=ximBlRFOMQKg0q6Rac19%2FaVNnyNaBUfkHm9Me5NYj2k%3D&reserved=0
> Suggested-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Reviewed-by : Syed Saba Kareem<syed.sabakareem@....com>

> ---
> Changes in v2:
> - Instead of setting ret to -ENODEV and going to de_init, just 'return 0' in
>    the default case (Vijendar)
> Link to v1: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fr%2F20230105-wsometimes-uninitialized-pci-ps-c-v1-1-4022fd077959%40kernel.org&data=05%7C01%7CSyed.SabaKareem%40amd.com%7Cab19d64e997043ee07ae08daef7f10d0%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C638085626264112039%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=rjsus%2BLxO7v%2F94R48F8VxQXtkt8QnibZLcCbEFLq%2F1g%3D&reserved=0
> ---
>   sound/soc/amd/ps/pci-ps.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
> index 401cfd0036be..64648b75de6b 100644
> --- a/sound/soc/amd/ps/pci-ps.c
> +++ b/sound/soc/amd/ps/pci-ps.c
> @@ -217,7 +217,7 @@ static int create_acp63_platform_devs(struct pci_dev *pci, struct acp63_dev_data
>   		break;
>   	default:
>   		dev_dbg(&pci->dev, "No PDM devices found\n");
> -		goto de_init;
> +		return 0;
>   	}
>   
>   	for (index = 0; index < adata->pdev_count; index++) {
>
> ---
> base-commit: 03178b4f7e2c59ead102e5ab5acb82ce1eaefe46
> change-id: 20230105-wsometimes-uninitialized-pci-ps-c-3b5725c6ed31
>
> Best regards,