linux-kernel - Re: [PATCH] extcon: arizona: Correct error handling on regmap_update_bits

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Message-ID: <92a28c6f-9c58-d762-f635-f5a93e602843@samsung.com>
Date:   Wed, 29 May 2019 14:37:06 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     myungjoo.ham@...sung.com, patches@...nsource.cirrus.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] extcon: arizona: Correct error handling on
 regmap_update_bits_check

Hi,

On 19. 5. 29. 오전 1:50, Charles Keepax wrote:
> Ensure the case when regmap_update_bits_check fails and the change
> variable is not updated is handled correctly.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
> ---
>  drivers/extcon/extcon-arizona.c | 22 +++++++++++++---------
>  1 file changed, 13 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
> index 9327479c719c2..ba2d16de161f8 100644
> --- a/drivers/extcon/extcon-arizona.c
> +++ b/drivers/extcon/extcon-arizona.c
> @@ -335,10 +335,12 @@ static void arizona_start_mic(struct arizona_extcon_info *info)
>  
>  	arizona_extcon_pulse_micbias(info);
>  
> -	regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
> -				 ARIZONA_MICD_ENA, ARIZONA_MICD_ENA,
> -				 &change);
> -	if (!change) {
> +	ret = regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
> +				       ARIZONA_MICD_ENA, ARIZONA_MICD_ENA,
> +				       &change);
> +	if (ret < 0) {
> +		dev_err(arizona->dev, "Failed to enable micd: %d\n", ret);
> +	} else if (!change) {
>  		regulator_disable(info->micvdd);
>  		pm_runtime_put_autosuspend(info->dev);
>  	}
> @@ -350,12 +352,14 @@ static void arizona_stop_mic(struct arizona_extcon_info *info)
>  	const char *widget = arizona_extcon_get_micbias(info);
>  	struct snd_soc_dapm_context *dapm = arizona->dapm;
>  	struct snd_soc_component *component = snd_soc_dapm_to_component(dapm);
> -	bool change;
> +	bool change = false;
>  	int ret;
>  
> -	regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
> -				 ARIZONA_MICD_ENA, 0,
> -				 &change);
> +	ret = regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
> +				       ARIZONA_MICD_ENA, 0,
> +				       &change);
> +	if (ret < 0)
> +		dev_err(arizona->dev, "Failed to disable micd: %d\n", ret);
>  
>  	ret = snd_soc_component_disable_pin(component, widget);
>  	if (ret != 0)
> @@ -1726,7 +1730,7 @@ static int arizona_extcon_remove(struct platform_device *pdev)
>  	struct arizona_extcon_info *info = platform_get_drvdata(pdev);
>  	struct arizona *arizona = info->arizona;
>  	int jack_irq_rise, jack_irq_fall;
> -	bool change;
> +	bool change = false;
>  
>  	regmap_update_bits_check(arizona->regmap, ARIZONA_MIC_DETECT_1,
>  				 ARIZONA_MICD_ENA, 0,

You better to check the return value as the part of this patch.


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics