linux-kernel - Re: [PATCH 4/4] pwm: Convert pwm-vt8500 to use devm

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Message-ID: <20120630194528.GA24411@avionic-0098.mockup.avionic-design.de>
Date:	Sat, 30 Jun 2012 21:45:28 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Axel Lin <axel.lin@...il.com>
Cc:	linux-kernel@...r.kernel.org, Alexey Charkov <alchark@...il.com>
Subject: Re: [PATCH 4/4] pwm: Convert pwm-vt8500 to use devm_* APIs

On Fri, Jun 29, 2012 at 09:33:05PM +0800, Axel Lin wrote:
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
>  drivers/pwm/pwm-vt8500.c |   45 ++++++++-------------------------------------
>  1 file changed, 8 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-vt8500.c b/drivers/pwm/pwm-vt8500.c
[...]
> @@ -127,44 +127,24 @@ static int __devinit pwm_probe(struct platform_device *pdev)
>  	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (r == NULL) {
>  		dev_err(&pdev->dev, "no memory resource defined\n");
> -		ret = -ENODEV;
> -		goto err_free;
> -	}
> -
> -	r = request_mem_region(r->start, resource_size(r), pdev->name);
> -	if (r == NULL) {
> -		dev_err(&pdev->dev, "failed to request memory resource\n");
> -		ret = -EBUSY;
> -		goto err_free;
> +		return -ENODEV;
>  	}
>  
> -	chip->base = ioremap(r->start, resource_size(r));
> -	if (chip->base == NULL) {
> -		dev_err(&pdev->dev, "failed to ioremap() registers\n");
> -		ret = -ENODEV;
> -		goto err_free_mem;
> -	}
> +	chip->base = devm_request_and_ioremap(&pdev->dev, r);
> +	if (chip->base == NULL)
> +		return -ENODEV;

EADDRNOTAVAIL as well.

> @@ -172,16 +152,7 @@ static int __devexit pwm_remove(struct platform_device *pdev)
>  		return -ENODEV;
>  
>  	err = pwmchip_remove(&chip->chip);
> -	if (err < 0)
> -		return err;
> -
> -	iounmap(chip->base);
> -
> -	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	release_mem_region(r->start, resource_size(r));
> -
> -	kfree(chip);
> -	return 0;
> +	return err;

And merge these two remaining lines.

Thierry

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