linux-kernel - Re: [PATCH] [v2] extcon: arizona: Fix runtime PM imbalance on error

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Date:   Mon, 25 May 2020 12:37:16 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>, kjlu@....edu
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        patches@...nsource.cirrus.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] extcon: arizona: Fix runtime PM imbalance on error

Hi Dinghao Liu,

On 5/23/20 3:17 PM, Dinghao Liu wrote:
> When arizona_request_irq() returns an error code, a
> pairing runtime PM usage counter decrement is needed
> to keep the counter balanced. For error paths after
> this function, things are the same.
> 
> Also, remove calls to pm_runtime_disable() when
> pm_runtime_enable() has not been executed.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
> 
> Changelog:
> 
> v2: - Add a new label "err_pm" to balance refcount.
>       Remove 3 calls to pm_runtime_disable().
>       Move pm_runtime_put() from the front of
>       input_register_device() to the back.
> ---
>  drivers/extcon/extcon-arizona.c | 17 +++++++++--------
>  1 file changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
> index 7401733db08b..aae82db542a5 100644
> --- a/drivers/extcon/extcon-arizona.c
> +++ b/drivers/extcon/extcon-arizona.c
> @@ -1460,7 +1460,7 @@ static int arizona_extcon_probe(struct platform_device *pdev)
>  	if (!info->input) {
>  		dev_err(arizona->dev, "Can't allocate input dev\n");
>  		ret = -ENOMEM;
> -		goto err_register;
> +		return ret;
>  	}
>  
>  	info->input->name = "Headset";
> @@ -1492,7 +1492,7 @@ static int arizona_extcon_probe(struct platform_device *pdev)
>  		if (ret != 0) {
>  			dev_err(arizona->dev, "Failed to request GPIO%d: %d\n",
>  				pdata->micd_pol_gpio, ret);
> -			goto err_register;
> +			return ret;
>  		}
>  
>  		info->micd_pol_gpio = gpio_to_desc(pdata->micd_pol_gpio);
> @@ -1515,7 +1515,7 @@ static int arizona_extcon_probe(struct platform_device *pdev)
>  			dev_err(arizona->dev,
>  				"Failed to get microphone polarity GPIO: %d\n",
>  				ret);
> -			goto err_register;
> +			return ret;
>  		}
>  	}
>  
> @@ -1672,7 +1672,7 @@ static int arizona_extcon_probe(struct platform_device *pdev)
>  	if (ret != 0) {
>  		dev_err(&pdev->dev, "Failed to get JACKDET rise IRQ: %d\n",
>  			ret);
> -		goto err_gpio;
> +		goto err_pm;
>  	}
>  
>  	ret = arizona_set_irq_wake(arizona, jack_irq_rise, 1);
> @@ -1721,14 +1721,14 @@ static int arizona_extcon_probe(struct platform_device *pdev)
>  		dev_warn(arizona->dev, "Failed to set MICVDD to bypass: %d\n",
>  			 ret);
>  
> -	pm_runtime_put(&pdev->dev);
> -
>  	ret = input_register_device(info->input);
>  	if (ret) {
>  		dev_err(&pdev->dev, "Can't register input device: %d\n", ret);
>  		goto err_hpdet;
>  	}
>  
> +	pm_runtime_put(&pdev->dev);
> +
>  	return 0;
>  
>  err_hpdet:
> @@ -1743,10 +1743,11 @@ static int arizona_extcon_probe(struct platform_device *pdev)
>  	arizona_set_irq_wake(arizona, jack_irq_rise, 0);
>  err_rise:
>  	arizona_free_irq(arizona, jack_irq_rise, info);
> +err_pm:
> +	pm_runtime_put(&pdev->dev);
> +	pm_runtime_disable(&pdev->dev);
>  err_gpio:
>  	gpiod_put(info->micd_pol_gpio);
> -err_register:
> -	pm_runtime_disable(&pdev->dev);
>  	return ret;
>  }
>  
> 

Applied it. Thanks. 

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics