linux-kernel - Re: [PATCH] ASoC: amd: Return ENODEV if acp63 is not found.

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Date:   Thu, 5 Jan 2023 14:49:17 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Tom Rix <trix@...hat.com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, ndesaulniers@...gle.com, Vijendar.Mukunda@....com,
        Syed.SabaKareem@....com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] ASoC: amd: Return ENODEV if acp63 is not found.

Hi Tom,

On Thu, Jan 05, 2023 at 04:19:12PM -0500, Tom Rix wrote:
> The clang build fails with
> sound/soc/amd/ps/pci-ps.c:218:2: error: variable 'ret' is used
>   uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
>         default:
>         ^~~~~~~
> 
> When no device is found -ENODEV should be returned.
> A switch with a single case is overkill, change to if-else.
> 
> Fixes: 1d325cdaf7a2 ("ASoC: amd: ps: refactor platform device creation logic")
> Signed-off-by: Tom Rix <trix@...hat.com>

Thanks for the patch! I sent basically the same thing earlier today
(sorry for forgetting to Cc you directly) and was told it was not
correct:

https://lore.kernel.org/6bb126b7-1cb4-0c4c-d357-fadc3ffdd3f9@amd.com/

I am just waiting for some feedback before sending a v2.

> ---
>  sound/soc/amd/ps/pci-ps.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
> index 401cfd0036be..cba8800ab4ea 100644
> --- a/sound/soc/amd/ps/pci-ps.c
> +++ b/sound/soc/amd/ps/pci-ps.c
> @@ -205,8 +205,7 @@ static int create_acp63_platform_devs(struct pci_dev *pci, struct acp63_dev_data
>  		memset(&pdevinfo, 0, sizeof(pdevinfo));
>  	}
>  
> -	switch (adata->pdev_mask) {
> -	case ACP63_PDM_DEV_MASK:
> +	if (adata->pdev_mask == ACP63_PDM_DEV_MASK) {
>  		adata->pdm_dev_index  = 0;
>  		acp63_fill_platform_dev_info(&pdevinfo[0], parent, NULL, "acp_ps_pdm_dma",
>  					     0, adata->res, 1, NULL, 0);
> @@ -214,8 +213,8 @@ static int create_acp63_platform_devs(struct pci_dev *pci, struct acp63_dev_data
>  					     0, NULL, 0, NULL, 0);
>  		acp63_fill_platform_dev_info(&pdevinfo[2], parent, NULL, "acp_ps_mach",
>  					     0, NULL, 0, NULL, 0);
> -		break;
> -	default:
> +	} else {
> +		ret = -ENODEV;
>  		dev_dbg(&pci->dev, "No PDM devices found\n");
>  		goto de_init;
>  	}
> -- 
> 2.27.0
> 
>