linux-kernel - Re: [PATCH 4/8] extcon: max14577: Use devm_extcon_dev

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Date:	Wed, 16 Apr 2014 13:40:20 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Sangjung Woo <sangjung.woo@...sung.com>
Cc:	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] extcon: max14577: Use devm_extcon_dev_register()

On śro, 2014-04-16 at 19:26 +0900, Sangjung Woo wrote:
> Use the resource-managed extcon device register function (i.e.
> devm_extcon_dev_register()) instead of extcon_dev_register(). If extcon device
> is attached with this function, that extcon device is automatically unregistered
> on driver detach. That reduces tiresome managing code.
> 
> Signed-off-by: Sangjung Woo <sangjung.woo@...sung.com>
> ---
>  drivers/extcon/extcon-max14577.c |    9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)

Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>

Best regards,
Krzysztof


> 
> diff --git a/drivers/extcon/extcon-max14577.c b/drivers/extcon/extcon-max14577.c
> index 1fef08d..c6166e7 100644
> --- a/drivers/extcon/extcon-max14577.c
> +++ b/drivers/extcon/extcon-max14577.c
> @@ -675,7 +675,7 @@ static int max14577_muic_probe(struct platform_device *pdev)
>  	}
>  	info->edev->name = DEV_NAME;
>  	info->edev->supported_cable = max14577_extcon_cable;
> -	ret = extcon_dev_register(info->edev);
> +	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "failed to register extcon device\n");
>  		return ret;
> @@ -694,7 +694,7 @@ static int max14577_muic_probe(struct platform_device *pdev)
>  			MAX14577_REG_DEVICEID, &id);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "failed to read revision number\n");
> -		goto err_extcon;
> +		return ret;
>  	}
>  	dev_info(info->dev, "device ID : 0x%x\n", id);
>  
> @@ -714,10 +714,6 @@ static int max14577_muic_probe(struct platform_device *pdev)
>  			delay_jiffies);
>  
>  	return ret;
> -
> -err_extcon:
> -	extcon_dev_unregister(info->edev);
> -	return ret;
>  }
>  
>  static int max14577_muic_remove(struct platform_device *pdev)
> @@ -725,7 +721,6 @@ static int max14577_muic_remove(struct platform_device *pdev)
>  	struct max14577_muic_info *info = platform_get_drvdata(pdev);
>  
>  	cancel_work_sync(&info->irq_work);
> -	extcon_dev_unregister(info->edev);
>  
>  	return 0;
>  }

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