linux-kernel - Re: [PATCH 2/29] video: mxsfb: simplify use of devm_ioremap

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Date:	Fri, 30 Aug 2013 10:51:48 +0300
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Julia Lawall <Julia.Lawall@...6.fr>
CC:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	<kernel-janitors@...r.kernel.org>, <linux-fbdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/29] video: mxsfb: simplify use of devm_ioremap_resource

On 14/08/13 12:11, Julia Lawall 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/video/mxsfb.c |    7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c
> index c2d3514..d250ed0 100644
> --- a/drivers/video/mxsfb.c
> +++ b/drivers/video/mxsfb.c
> @@ -855,12 +855,6 @@ static int mxsfb_probe(struct platform_device *pdev)
>  	if (of_id)
>  		pdev->id_entry = of_id->data;
>  
> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!res) {
> -		dev_err(&pdev->dev, "Cannot get memory IO resource\n");
> -		return -ENODEV;
> -	}
> -
>  	fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev);
>  	if (!fb_info) {
>  		dev_err(&pdev->dev, "Failed to allocate fbdev\n");
> @@ -869,6 +863,7 @@ static int mxsfb_probe(struct platform_device *pdev)
>  
>  	host = to_imxfb_host(fb_info);
>  
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	host->base = devm_ioremap_resource(&pdev->dev, res);
>  	if (IS_ERR(host->base)) {
>  		ret = PTR_ERR(host->base);
> 

Thanks, queued for 3.12.

 Tomi



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