linux-kernel - Re: [PATCH RESEND v2 5/5] extcon: extcon-max8997: Simplify driver using devm

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Date:   Thu, 10 Jun 2021 18:57:41 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Matti Vaittinen <mazziesaccount@...il.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v2 5/5] extcon: extcon-max8997: Simplify driver
 using devm

On 6/8/21 7:10 PM, Matti Vaittinen wrote:
> Simplify driver by switching to use the resource managed IRQ
> requesting and resource managed work-queue initialization.
> 
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> ---
> Changelog:
>  v2:
>   - IRQ freeing fix splitted in own patch
> 
> Please note that the change is compile-tested only. All proper testing is
> highly appreciated.
> ---
>  drivers/extcon/extcon-max8997.c | 47 +++++++++++----------------------
>  1 file changed, 16 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-max8997.c b/drivers/extcon/extcon-max8997.c
> index c15a612067af..bbc592823570 100644
> --- a/drivers/extcon/extcon-max8997.c
> +++ b/drivers/extcon/extcon-max8997.c
> @@ -5,6 +5,7 @@
>  //  Copyright (C) 2012 Samsung Electronics
>  //  Donggeun Kim <dg77.kim@...sung.com>
>  
> +#include <linux/devm-helpers.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/i2c.h>
> @@ -650,27 +651,30 @@ static int max8997_muic_probe(struct platform_device *pdev)
>  	mutex_init(&info->mutex);
>  
>  	INIT_WORK(&info->irq_work, max8997_muic_irq_work);
> +	ret = devm_work_autocancel(&pdev->dev, &info->irq_work,
> +				   max8997_muic_irq_work);
> +	if (ret)
> +		return ret;
>  
>  	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
>  		struct max8997_muic_irq *muic_irq = &muic_irqs[i];
>  		unsigned int virq = 0;
>  
>  		virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
> -		if (!virq) {
> -			ret = -EINVAL;
> -			goto err_irq;
> -		}
> +		if (!virq)
> +			return -EINVAL;
> +
>  		muic_irq->virq = virq;
>  
> -		ret = request_threaded_irq(virq, NULL,
> -				max8997_muic_irq_handler,
> -				IRQF_NO_SUSPEND,
> -				muic_irq->name, info);
> +		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
> +						max8997_muic_irq_handler,
> +						IRQF_NO_SUSPEND,
> +						muic_irq->name, info);
>  		if (ret) {
>  			dev_err(&pdev->dev,
>  				"failed: irq request (IRQ: %d, error :%d)\n",
>  				muic_irq->irq, ret);
> -			goto err_irq;
> +			return ret;
>  		}
>  	}
>  
> @@ -678,14 +682,13 @@ static int max8997_muic_probe(struct platform_device *pdev)
>  	info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
>  	if (IS_ERR(info->edev)) {
>  		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
> -		ret = PTR_ERR(info->edev);
> -		goto err_irq;
> +		return PTR_ERR(info->edev);
>  	}
>  
>  	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "failed to register extcon device\n");
> -		goto err_irq;
> +		return ret;
>  	}
>  
>  	if (pdata && pdata->muic_pdata) {
> @@ -733,7 +736,7 @@ static int max8997_muic_probe(struct platform_device *pdev)
>  				2, info->status);
>  	if (ret) {
>  		dev_err(info->dev, "failed to read MUIC register\n");
> -		goto err_irq;
> +		return ret;
>  	}
>  	cable_type = max8997_muic_get_cable_type(info,
>  					   MAX8997_CABLE_GROUP_ADC, &attached);
> @@ -756,23 +759,6 @@ static int max8997_muic_probe(struct platform_device *pdev)
>  			delay_jiffies);
>  
>  	return 0;
> -
> -err_irq:
> -	while (--i >= 0)
> -		free_irq(muic_irqs[i].virq, info);
> -	return ret;
> -}
> -
> -static int max8997_muic_remove(struct platform_device *pdev)
> -{
> -	struct max8997_muic_info *info = platform_get_drvdata(pdev);
> -	int i;
> -
> -	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
> -		free_irq(muic_irqs[i].virq, info);
> -	cancel_work_sync(&info->irq_work);
> -
> -	return 0;
>  }
>  
>  static struct platform_driver max8997_muic_driver = {
> @@ -780,7 +766,6 @@ static struct platform_driver max8997_muic_driver = {
>  		.name	= DEV_NAME,
>  	},
>  	.probe		= max8997_muic_probe,
> -	.remove		= max8997_muic_remove,
>  };
>  
>  module_platform_driver(max8997_muic_driver);
> 

Acked-by: Chanwoo Choi <cw00.choi@...sung.com>

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics