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

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Date:   Thu, 5 Jan 2023 22:34:10 +0530
From:   "Mukunda,Vijendar" <vijendar.mukunda@....com>
To:     Nathan Chancellor <nathan@...nel.org>, lgirdwood@...il.com,
        broonie@...nel.org
Cc:     Syed.SabaKareem@....com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] ASoC: amd: ps: Fix uninitialized ret in
 create_acp64_platform_devs()

On 05/01/23 21:23, 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.
>
> Return -ENODEV, which matches the debug message's description of this block.
>
> 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%7CVijendar.Mukunda%40amd.com%7Cad26656c3d2f4c75d00208daef350528%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C638085308267581104%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=eeHVStOIOcy%2FdDISOKlGNeyEwx4i5AtJZmQ5dcNB7XQ%3D&reserved=0
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>
> ---
>  sound/soc/amd/ps/pci-ps.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
> index 401cfd0036be..f54b9fd9c3ce 100644
> --- a/sound/soc/amd/ps/pci-ps.c
> +++ b/sound/soc/amd/ps/pci-ps.c
> @@ -217,6 +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");
> +		ret = -ENODEV;
ACP PCI driver supports different configurations. As per design , even  when no child dev
nodes are created , ACP driver probe should be successful. ACP PCI driver probe failure
causes power state transition failures when no child device nodes are created.
We should not return -ENODEV in this case.
return 0 is enough in this case. No need to de-init the ACP.


>  		goto de_init;
>  	}
>  
>
> ---
> base-commit: 03178b4f7e2c59ead102e5ab5acb82ce1eaefe46
> change-id: 20230105-wsometimes-uninitialized-pci-ps-c-3b5725c6ed31
>
> Best regards,