linux-kernel - Re: [PATCH] watchdog: davinci_wdt: update to devm

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Date:	Thu, 07 Feb 2013 15:21:37 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	"Kumar, Anil" <anilkumar.v@...com>
CC:	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
	davinci-linux-open-source@...ux.davincidsp.com, wim@...ana.be
Subject: Re: [PATCH] watchdog: davinci_wdt: update to devm_* API

Hello.

On 07-02-2013 7:32, Kumar, Anil wrote:

> Update the code to use devm_* API so that driver
> core will manage resources.

> Signed-off-by: Kumar, Anil <anilkumar.v@...com>
> ---
> This patch applies on top of v3.8-rc6.

> Tested on da850 EVM.

> :100644 100644 e8e8724... 6ad76a3... M	drivers/watchdog/davinci_wdt.c
>   drivers/watchdog/davinci_wdt.c |   34 +++++++++-------------------------
>   1 files changed, 9 insertions(+), 25 deletions(-)

> diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
> index e8e8724..6ad76a3 100644
> --- a/drivers/watchdog/davinci_wdt.c
> +++ b/drivers/watchdog/davinci_wdt.c
[...]
> @@ -213,49 +212,34 @@ static int davinci_wdt_probe(struct platform_device *pdev)
[...]
> -	size = resource_size(wdt_mem);
> -	if (!request_mem_region(wdt_mem->start, size, pdev->name)) {
> -		dev_err(dev, "failed to get memory region\n");
> -		return -ENOENT;
> -	}
> -
> -	wdt_base = ioremap(wdt_mem->start, size);
> +	wdt_base = devm_request_and_ioremap(&pdev->dev, wdt_mem);
>   	if (!wdt_base) {
> -		dev_err(dev, "failed to map memory region\n");
> -		release_mem_region(wdt_mem->start, size);
> -		wdt_mem = NULL;
> +		dev_err(&pdev->dev, "ioremap failed\n");
>   		return -ENOMEM;

    Comment to devm_request_and_ioremap() suggest returning -EADDRNOTAVAIL 
instead.

WBR, Sergei

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