linux-kernel - Re: [PATCH 2/6] watchdog: simplify platform_get_resource_byname/devm_ioremap

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Date:	Mon, 19 Aug 2013 06:06:35 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Julia Lawall <Julia.Lawall@...6.fr>
CC:	Wim Van Sebroeck <wim@...ana.be>, kernel-janitors@...r.kernel.org,
	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] watchdog: simplify platform_get_resource_byname/devm_ioremap_resource

On 08/19/2013 01:51 AM, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@...6.fr>
>
> Remove unneeded error handling on the result of a call to
> platform_get_resource_byname when the value is passed to devm_ioremap_resource.
>
> A simplified version of the semantic patch that makes this change is as
> follows: (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @@
> expression pdev,res,e,e1;
> expression ret != 0;
> identifier l;
> @@
>
>    res = platform_get_resource_byname(...);
> - if (res == NULL) { ... \(goto l;\|return ret;\) }
>    e = devm_ioremap_resource(e1, res);
> // </smpl>
>
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   drivers/watchdog/ar7_wdt.c |    5 -----
>   1 file changed, 5 deletions(-)
>
> diff --git a/drivers/watchdog/ar7_wdt.c b/drivers/watchdog/ar7_wdt.c
> index 2f3cc8f..b3709f9 100644
> --- a/drivers/watchdog/ar7_wdt.c
> +++ b/drivers/watchdog/ar7_wdt.c
> @@ -280,11 +280,6 @@ static int ar7_wdt_probe(struct platform_device *pdev)
>
>   	ar7_regs_wdt =
>   		platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
> -	if (!ar7_regs_wdt) {
> -		pr_err("could not get registers resource\n");
> -		return -ENODEV;
> -	}
> -
>   	ar7_wdt = devm_ioremap_resource(&pdev->dev, ar7_regs_wdt);
>   	if (IS_ERR(ar7_wdt))
>   		return PTR_ERR(ar7_wdt);
>
> --
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>

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