linux-kernel - Re: [PATCH 3/29] drivers/gpio: simplify use of devm_ioremap

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Date:	Wed, 14 Aug 2013 14:53:57 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	kernel-janitors@...r.kernel.org, linux-gpio@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	spear-devel <spear-devel@...t.st.com>
Subject: Re: [PATCH 3/29] drivers/gpio: simplify use of devm_ioremap_resource

On Wed, Aug 14, 2013 at 2:41 PM, Julia Lawall <Julia.Lawall@...6.fr> wrote:
> From: Julia Lawall <Julia.Lawall@...6.fr>
>
> Remove unneeded error handling on the result of a call to
> platform_get_resource when the value is passed to devm_ioremap_resource.
>
> Move the call to platform_get_resource adjacent to the call to
> devm_ioremap_resource to make the connection between them more clear.
>
> A simplified version of the semantic patch that makes this change is as
> follows: (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @@
> expression pdev,res,n,e,e1;
> expression ret != 0;
> identifier l;
> @@
>
> - res = platform_get_resource(pdev, IORESOURCE_MEM, n);
>   ... when != res
> - if (res == NULL) { ... \(goto l;\|return ret;\) }
>   ... when != res
> + res = platform_get_resource(pdev, IORESOURCE_MEM, n);
>   e = devm_ioremap_resource(e1, res);
> // </smpl>
>
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
>
> ---

>  drivers/gpio/gpio-spear-spics.c |    7 +------
>  2 files changed, 2 insertions(+), 12 deletions(-)

For SPEAr:

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

> diff --git a/drivers/gpio/gpio-spear-spics.c b/drivers/gpio/gpio-spear-spics.c
> index 7a4bf7c..e9a0415 100644
> --- a/drivers/gpio/gpio-spear-spics.c
> +++ b/drivers/gpio/gpio-spear-spics.c
> @@ -128,18 +128,13 @@ static int spics_gpio_probe(struct platform_device *pdev)
>         struct resource *res;
>         int ret;
>
> -       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -       if (!res) {
> -               dev_err(&pdev->dev, "invalid IORESOURCE_MEM\n");
> -               return -EBUSY;
> -       }
> -
>         spics = devm_kzalloc(&pdev->dev, sizeof(*spics), GFP_KERNEL);
>         if (!spics) {
>                 dev_err(&pdev->dev, "memory allocation fail\n");
>                 return -ENOMEM;
>         }
>
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>         spics->base = devm_ioremap_resource(&pdev->dev, res);
>         if (IS_ERR(spics->base))
>                 return PTR_ERR(spics->base);
>
> --
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