Re: [PATCH] ASoC: fsl-asoc-card: Fix jack_event() always return 0

[Christophe Leroy <christophe.leroy@csgroup.eu>]

Le 18/03/2022 à 10:35, Meng Tang a écrit :
> Today, hp_jack_event and mic_jack_event always return 0. However,
> snd_soc_dapm_disable_pin and snd_soc_dapm_enable_pin may return a
> non-zero value, this will cause the user who calling hp_jack_event
> and mic_jack_event don't know whether the operation was really
> successfully.
> 
> This patch corrects the behavior by properly returning 1 when the
> value gets updated.
> 
> Signed-off-by: Meng Tang <tangmeng@uniontech.com>
> ---
>   sound/soc/fsl/fsl-asoc-card.c | 16 ++++++++++------
>   1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c
> index 370bc790c6ba..f2641c2cb047 100644
> --- a/sound/soc/fsl/fsl-asoc-card.c
> +++ b/sound/soc/fsl/fsl-asoc-card.c
> @@ -457,16 +457,18 @@ static int fsl_asoc_card_audmux_init(struct device_node *np,
>   static int hp_jack_event(struct notifier_block *nb, unsigned long event,
>   			 void *data)
>   {
> +	int ret;
> +

You don't need that new local var. There are coccinelle scripts that 
track those unnecessary intermediates so don't add a new one.

>   	struct snd_soc_jack *jack = (struct snd_soc_jack *)data;
>   	struct snd_soc_dapm_context *dapm = &jack->card->dapm;
>   
>   	if (event & SND_JACK_HEADPHONE)
>   		/* Disable speaker if headphone is plugged in */
> -		snd_soc_dapm_disable_pin(dapm, "Ext Spk");
> +		ret = snd_soc_dapm_disable_pin(dapm, "Ext Spk");

Should be
		return snd_soc_dapm_disable_pin(dapm, "Ext Spk");

>   	else
> -		snd_soc_dapm_enable_pin(dapm, "Ext Spk");
> +		ret = snd_soc_dapm_enable_pin(dapm, "Ext Spk");

and

		return snd_soc_dapm_enable_pin(dapm, "Ext Spk");

>   
> -	return 0;
> +	return ret;

And completely drop that.

>   }
>   
>   static struct notifier_block hp_jack_nb = {
> @@ -476,16 +478,18 @@ static struct notifier_block hp_jack_nb = {
>   static int mic_jack_event(struct notifier_block *nb, unsigned long event,
>   			  void *data)
>   {
> +	int ret;
> +

And do exactly the same here.

>   	struct snd_soc_jack *jack = (struct snd_soc_jack *)data;
>   	struct snd_soc_dapm_context *dapm = &jack->card->dapm;
>   
>   	if (event & SND_JACK_MICROPHONE)
>   		/* Disable dmic if microphone is plugged in */
> -		snd_soc_dapm_disable_pin(dapm, "DMIC");
> +		ret = snd_soc_dapm_disable_pin(dapm, "DMIC");
>   	else
> -		snd_soc_dapm_enable_pin(dapm, "DMIC");
> +		ret = snd_soc_dapm_enable_pin(dapm, "DMIC");
>   
> -	return 0;
> +	return ret;
>   }
>   
>   static struct notifier_block mic_jack_nb = {