linux-kernel - Re: [PATCH 1/4] pwm: Convert pwm-imx to use devm

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Date:	Sat, 30 Jun 2012 20:43:52 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Axel Lin <axel.lin@...il.com>
Cc:	linux-kernel@...r.kernel.org, Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [PATCH 1/4] pwm: Convert pwm-imx to use devm_* APIs

On Fri, Jun 29, 2012 at 09:30:28PM +0800, Axel Lin wrote:
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
>  drivers/pwm/pwm-imx.c |   55 +++++++++----------------------------------------
>  1 file changed, 10 insertions(+), 45 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
[...]
> @@ -182,46 +180,24 @@ static int __devinit imx_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_clk;
> -	}
> -
> -	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_clk;
> +		return -ENODEV;
>  	}
>  
> -	imx->mmio_base = ioremap(r->start, resource_size(r));
> -	if (imx->mmio_base == NULL) {
> -		dev_err(&pdev->dev, "failed to ioremap() registers\n");
> -		ret = -ENODEV;
> -		goto err_free_mem;
> -	}
> +	imx->mmio_base = devm_request_and_ioremap(&pdev->dev, r);
> +	if (imx->mmio_base == NULL)
> +		return -ENODEV;

The documentation says that the standard error code for failure here is
EADDRNOTAVAIL.

> @@ -229,18 +205,7 @@ static int __devexit imx_pwm_remove(struct platform_device *pdev)
>  		return -ENODEV;
>  
>  	ret = pwmchip_remove(&imx->chip);
> -	if (ret)
> -		return ret;
> -
> -	iounmap(imx->mmio_base);
> -
> -	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	release_mem_region(r->start, resource_size(r));
> -
> -	clk_put(imx->clk);
> -
> -	kfree(imx);
> -	return 0;
> +	return ret;

I think you can just "return pwmchip_remove(...);", no need to store the
result in ret.

Thierry

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