linux-kernel - Re: [PATCH] ASoC: stm32: sai: add missing put

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Date:   Mon, 11 Feb 2019 15:09:45 +0000
From:   Olivier MOYSAN <olivier.moysan@...com>
To:     Wen Yang <yellowriver2010@...mail.com>,
        Arnaud POULIQUEN <arnaud.pouliquen@...com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "Alexandre TORGUE" <alexandre.torgue@...com>
CC:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: stm32: sai: add missing put_device()

Hi Wen,

On 2/9/19 11:41 AM, Wen Yang wrote:
> The of_find_device_by_node() takes a reference to the underlying device
> structure, we should release that reference.
> 
> Fixes: 7dd0d835582f ("ASoC: stm32: sai: simplify sync modes management")
> Signed-off-by: Wen Yang <yellowriver2010@...mail.com>
> ---
>   sound/soc/stm/stm32_sai.c | 11 ++++++++---
>   1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/soc/stm/stm32_sai.c b/sound/soc/stm/stm32_sai.c
> index bcb35ca..14c9591 100644
> --- a/sound/soc/stm/stm32_sai.c
> +++ b/sound/soc/stm/stm32_sai.c
> @@ -112,16 +112,21 @@ static int stm32_sai_set_sync(struct stm32_sai_data *sai_client,

goto error also in previous test
	if (!pdev) {
		...
		ret = -ENODEV;
		goto error;
	}

>   	if (!sai_provider) {
>   		dev_err(&sai_client->pdev->dev,
>   			"SAI sync provider data not found\n");
> -		return -EINVAL;
> +		ret = -EINVAL;
> +		goto out_put_dev;
>   	}
>   
>   	/* Configure sync client */
>   	ret = stm32_sai_sync_conf_client(sai_client, synci);
>   	if (ret < 0)
> -		return ret;
> +		goto out_put_dev;
>   
>   	/* Configure sync provider */
> -	return stm32_sai_sync_conf_provider(sai_provider, synco);
> +	ret = stm32_sai_sync_conf_provider(sai_provider, synco);
> +
> +out_put_dev:
> +	put_device(&pdev->dev);
> +	return ret;

Here I propose:
error:
	of_node_put(np_provider);
	return ret;

>   }
>   
>   static int stm32_sai_probe(struct platform_device *pdev)
> 

Thanks for your patch. Please, see my comments above.

Regards
Olivier