Re: [PATCH 2/4] ASoC: stm32: sai: fix clk prepare imbalance on probe failure

[Olivier MOYSAN <olivier.moysan@foss.st.com>]

On 11/24/25 11:49, Johan Hovold wrote:
> Make sure to unprepare the parent clock also on probe failures (e.g.
> probe deferral).
> 
> Fixes: a14bf98c045b ("ASoC: stm32: sai: fix possible circular locking")
> Cc: stable@vger.kernel.org	# 5.5
> Cc: Olivier Moysan <olivier.moysan@st.com>
> Signed-off-by: Johan Hovold <johan@kernel.org>

Reviewed-by: olivier moysan <olivier.moysan@foss.st.com>

Olivier

> ---
>   sound/soc/stm/stm32_sai_sub.c | 28 +++++++++++++++++++++-------
>   1 file changed, 21 insertions(+), 7 deletions(-)
> 
> diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
> index 0ae1eae2a59e..7a005b4ad304 100644
> --- a/sound/soc/stm/stm32_sai_sub.c
> +++ b/sound/soc/stm/stm32_sai_sub.c
> @@ -1634,14 +1634,21 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
>   	if (of_property_present(np, "#clock-cells")) {
>   		ret = stm32_sai_add_mclk_provider(sai);
>   		if (ret < 0)
> -			return ret;
> +			goto err_unprepare_pclk;
>   	} else {
>   		sai->sai_mclk = devm_clk_get_optional(&pdev->dev, "MCLK");
> -		if (IS_ERR(sai->sai_mclk))
> -			return PTR_ERR(sai->sai_mclk);
> +		if (IS_ERR(sai->sai_mclk)) {
> +			ret = PTR_ERR(sai->sai_mclk);
> +			goto err_unprepare_pclk;
> +		}
>   	}
>   
>   	return 0;
> +
> +err_unprepare_pclk:
> +	clk_unprepare(sai->pdata->pclk);
> +
> +	return ret;
>   }
>   
>   static int stm32_sai_sub_probe(struct platform_device *pdev)
> @@ -1688,26 +1695,33 @@ static int stm32_sai_sub_probe(struct platform_device *pdev)
>   			       IRQF_SHARED, dev_name(&pdev->dev), sai);
>   	if (ret) {
>   		dev_err(&pdev->dev, "IRQ request returned %d\n", ret);
> -		return ret;
> +		goto err_unprepare_pclk;
>   	}
>   
>   	if (STM_SAI_PROTOCOL_IS_SPDIF(sai))
>   		conf = &stm32_sai_pcm_config_spdif;
>   
>   	ret = snd_dmaengine_pcm_register(&pdev->dev, conf, 0);
> -	if (ret)
> -		return dev_err_probe(&pdev->dev, ret, "Could not register pcm dma\n");
> +	if (ret) {
> +		ret = dev_err_probe(&pdev->dev, ret, "Could not register pcm dma\n");
> +		goto err_unprepare_pclk;
> +	}
>   
>   	ret = snd_soc_register_component(&pdev->dev, &stm32_component,
>   					 &sai->cpu_dai_drv, 1);
>   	if (ret) {
>   		snd_dmaengine_pcm_unregister(&pdev->dev);
> -		return ret;
> +		goto err_unprepare_pclk;
>   	}
>   
>   	pm_runtime_enable(&pdev->dev);
>   
>   	return 0;
> +
> +err_unprepare_pclk:
> +	clk_unprepare(sai->pdata->pclk);
> +
> +	return ret;
>   }
>   
>   static void stm32_sai_sub_remove(struct platform_device *pdev)