linux-kernel - Re: [PATCH] gpio: using devm functions for timberdale gpio memory allocation This eases memory allocation and provides appropriate logging

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Date:	Tue, 13 May 2014 12:03:35 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	abdoulaye berthe <berthe.ab@...il.com>
Cc:	linus.walleij@...aro.org, gnurou@...il.com,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: using devm functions for timberdale gpio memory
 allocation This eases memory allocation and provides appropriate logging

On Tue, May 13, 2014 at 03:21:42AM +0200, abdoulaye berthe wrote:
[...]
> diff --git a/drivers/gpio/gpio-timberdale.c b/drivers/gpio/gpio-timberdale.c
[...]
>  	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (!iomem) {
> -		err = -EINVAL;
> -		goto err_mem;
> +		dev_err(dev, "Unable to get resource\n");
> +		return -EINVAL;
>  	}
[...]
> -	if (!request_mem_region(iomem->start, resource_size(iomem),
> -		DRIVER_NAME)) {
> -		err = -EBUSY;
> -		goto err_request;
> +	if (!devm_request_mem_region(dev, iomem->start, resource_size(iomem),
> +				     DRIVER_NAME)) {
> +		dev_err(dev, "Region already claimed\n");
> +		return -EBUSY;
>  	}
>  
> -	tgpio->membase = ioremap(iomem->start, resource_size(iomem));
> +	tgpio->membase = devm_ioremap(dev, iomem->start, resource_size(iomem));
>  	if (!tgpio->membase) {
> -		err = -ENOMEM;
> -		goto err_ioremap;
> +		dev_err(dev, "Cannot ioremap\n");
> +		return -ENOMEM;
>  	}

The above could be further simplified to:

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	tgpio->membase = devm_ioremap_resource(&pdev->dev, iomem);
	if (IS_ERR(tgpio->membase))
		return PTR_ERR(tgpio->membase);

Where devm_ioremap_resource() already provides error messages as
appropriate.

Thierry

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