Re: [PATCH v1 4/5] 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] Incomplete API update breaks TDM configuration parsing and error handling in the sc8280xp machine driver.
--

--- Patch [4]: [PATCH v1 4/5] ASoC: qcom: common: Distinguish missing and invalid TDM slot configuration ---
commit 2828c15bbb01105bac7c7698b0dd46a75894895f
Author: Prasad Kumpatla <prasad.kumpatla@oss.qualcomm.com>

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

This commit modifies the TDM slot configuration parser to return -ENOENT for
missing DAI-link configuration while preserving -EINVAL for malformed
properties. It also updates qcom_snd_apply_dai_tdm_slots() to handle the new
-ENOENT return code.

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
[ ... ]
> @@ -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 this API change break other callers that were not updated?

Looking at sc8280xp_tdm_hw_params() in sound/soc/qcom/sc8280xp.c, it still
expects -EINVAL for missing TDM configuration:

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 hw_params to fail when TDM configuration is intentionally
missing, since it now receives -ENOENT?

Could this also silently succeed on malformed configurations that return
-EINVAL, defeating the intent of the patch?

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

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260808181948.2489187-1-prasad.kumpatla@oss.qualcomm.com?part=4