Re: [PATCH v2 3/4] ASoC: qcom: common: Distinguish missing and invalid TDM slot configuration

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [High] Un-updated caller sc8280xp_tdm_hw_params() causes PCM initialization failure for missing TDM configurations and ignores malformed ones.
--

--- Patch [3]: [PATCH v2 3/4] ASoC: qcom: common: Distinguish missing and invalid TDM slot configuration ---
commit 6f19acb6aca2ed0950dcc6a8cc707f166eb0eb8c
Author: Prasad Kumpatla <prasad.kumpatla@oss.qualcomm.com>

ASoC: qcom: common: Distinguish missing and invalid TDM slot configuration

Return -ENOENT for missing DAI-link configuration and preserve -EINVAL
for malformed TDM slot properties.

Link: https://sashiko.dev/#/patchset/20260804070307.117119-1-prasad.kumpatla@oss.qualcomm.com

> diff --git a/sound/soc/qcom/common.c b/sound/soc/qcom/common.c
> index d231024206dbf..d9f256d519733 100644
> --- a/sound/soc/qcom/common.c
> +++ b/sound/soc/qcom/common.c
> @@ -103,14 +103,14 @@ static int qcom_snd_parse_dai_tdm_slots(struct snd_soc_pcm_runtime *rtd,
>  	int ret;
>  
>  	if (!link_np)
> -		return -EINVAL;
> +		return -ENOENT;
>  
>  	struct device_node *cpu_np __free(device_node) =
>  		of_get_child_by_name(link_np, "cpu");
>  	struct device_node *codec_np __free(device_node) =
>  		of_get_child_by_name(link_np, "codec");
>  	if (!cpu_np || !codec_np)
> -		return -EINVAL;
> +		return -ENOENT;
>  
>  	ret = qcom_snd_parse_tdm_slot(cpu_np, cpu_cfg);
>  	if (ret)
> @@ -172,7 +172,7 @@ int qcom_snd_apply_dai_tdm_slots(struct snd_soc_pcm_runtime *rtd)
>  
>  	ret = qcom_snd_get_dai_tdm_slots(rtd, &cpu_cfg, &codec_cfg);
>  	if (ret)
> -		return ret == -EINVAL ? 0 : ret;
> +		return ret == -ENOENT ? 0 : ret;

[Severity: High]
Does changing the return value here also require an update to
sc8280xp_tdm_hw_params() in sound/soc/qcom/sc8280xp.c?

Looking at sc8280xp_tdm_hw_params(), it calls qcom_snd_get_dai_tdm_slots()
which now returns -ENOENT for missing configurations. However, it still
appears to check for -EINVAL:

sound/soc/qcom/sc8280xp.c:sc8280xp_tdm_hw_params() {
	...
	ret = qcom_snd_get_dai_tdm_slots(rtd, &cpu_cfg, &codec_cfg);
	if (ret)
		return ret == -EINVAL ? 0 : ret;
	...
}

Will this cause sc8280xp_tdm_hw_params() to mistakenly return an error
(-ENOENT) when the configuration is missing, and incorrectly ignore the
error (-EINVAL) when the configuration is actually malformed?

>  
>  	return qcom_snd_apply_dai_tdm_slots_cfg(rtd, &cpu_cfg, &codec_cfg);
>  }

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260818084655.3240284-1-prasad.kumpatla@oss.qualcomm.com?part=3