linux-kernel - Re: [PATCH] video: mxsfb: Convert to devm_ioremap

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Date:	Tue, 12 Mar 2013 20:06:50 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Fabio Estevam <festevam@...il.com>
CC:	<FlorianSchandinat@....de>, <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: Re: [PATCH] video: mxsfb: Convert to devm_ioremap_resource()

On Mon, Mar 11, 2013 at 08:52:17PM -0300, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam@...escale.com>
> 
> Converting to devm_ioremap_resource() can make the code cleaner and smaller.
> 
While you are there, you may want to use devm_kzalloc() and
devm_clk_get() as well.

Shawn

> Signed-off-by: Fabio Estevam <fabio.estevam@...escale.com>
> ---
>  drivers/video/mxsfb.c |   19 ++++---------------
>  1 file changed, 4 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c
> index 755556c..26cbc56 100644
> --- a/drivers/video/mxsfb.c
> +++ b/drivers/video/mxsfb.c
> @@ -801,22 +801,17 @@ static int mxsfb_probe(struct platform_device *pdev)
>  		return -ENODEV;
>  	}
>  
> -	if (!request_mem_region(res->start, resource_size(res), pdev->name))
> -		return -EBUSY;
> -
>  	fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev);
>  	if (!fb_info) {
>  		dev_err(&pdev->dev, "Failed to allocate fbdev\n");
> -		ret = -ENOMEM;
> -		goto error_alloc_info;
> +		return -ENOMEM;
>  	}
>  
>  	host = to_imxfb_host(fb_info);
>  
> -	host->base = ioremap(res->start, resource_size(res));
> -	if (!host->base) {
> -		dev_err(&pdev->dev, "ioremap failed\n");
> -		ret = -ENOMEM;
> +	host->base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(host->base)) {
> +		return PTR_ERR(host->base);
>  		goto error_ioremap;
>  	}
>  
> @@ -904,11 +899,8 @@ error_panel_enable:
>  	clk_put(host->clk);
>  error_getclock:
>  error_getpin:
> -	iounmap(host->base);
>  error_ioremap:
>  	framebuffer_release(fb_info);
> -error_alloc_info:
> -	release_mem_region(res->start, resource_size(res));
>  
>  	return ret;
>  }
> @@ -917,7 +909,6 @@ static int mxsfb_remove(struct platform_device *pdev)
>  {
>  	struct fb_info *fb_info = platform_get_drvdata(pdev);
>  	struct mxsfb_info *host = to_imxfb_host(fb_info);
> -	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  
>  	if (host->enabled)
>  		mxsfb_disable_controller(fb_info);
> @@ -925,11 +916,9 @@ static int mxsfb_remove(struct platform_device *pdev)
>  	unregister_framebuffer(fb_info);
>  	kfree(fb_info->pseudo_palette);
>  	mxsfb_free_videomem(host);
> -	iounmap(host->base);
>  	clk_put(host->clk);
>  
>  	framebuffer_release(fb_info);
> -	release_mem_region(res->start, resource_size(res));
>  
>  	platform_set_drvdata(pdev, NULL);
>  
> -- 
> 1.7.9.5
> 

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