linux-kernel - Re: [PATCH] drivers/video/pxa168fb.c: use devm

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Date:	Tue, 28 Feb 2012 15:54:59 +0000
From:	Florian Tobias Schandinat <FlorianSchandinat@....de>
To:	Julia Lawall <Julia.Lawall@...6.fr>
CC:	kernel-janitors@...r.kernel.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/video/pxa168fb.c: use devm_ functions

On 02/18/2012 06:19 PM, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@...6.fr>
> 
> The various devm_ functions allocate memory that is released when a driver
> detaches.  This patch uses these functions for data that is allocated in
> the probe function of a platform device and is only freed in the remove
> function.
> 
> By using devm_ioremap, it also removes a potential memory leak, because
> there was no call to iounmap in the probe function.
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

Applied.


Thanks,

Florian Tobias Schandinat

> 
> ---
>  drivers/video/pxa168fb.c |   15 ++++++---------
>  1 file changed, 6 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/video/pxa168fb.c b/drivers/video/pxa168fb.c
> index 8384b94..f146089 100644
> --- a/drivers/video/pxa168fb.c
> +++ b/drivers/video/pxa168fb.c
> @@ -21,6 +21,7 @@
>  #include <linux/fb.h>
>  #include <linux/delay.h>
>  #include <linux/init.h>
> +#include <linux/io.h>
>  #include <linux/ioport.h>
>  #include <linux/platform_device.h>
>  #include <linux/dma-mapping.h>
> @@ -670,7 +671,8 @@ static int __devinit pxa168fb_probe(struct platform_device *pdev)
>  	/*
>  	 * Map LCD controller registers.
>  	 */
> -	fbi->reg_base = ioremap_nocache(res->start, resource_size(res));
> +	fbi->reg_base = devm_ioremap_nocache(&pdev->dev, res->start,
> +					     resource_size(res));
>  	if (fbi->reg_base == NULL) {
>  		ret = -ENOMEM;
>  		goto failed_free_info;
> @@ -739,8 +741,8 @@ static int __devinit pxa168fb_probe(struct platform_device *pdev)
>  	/*
>  	 * Register irq handler.
>  	 */
> -	ret = request_irq(irq, pxa168fb_handle_irq, IRQF_SHARED,
> -					info->fix.id, fbi);
> +	ret = devm_request_irq(&pdev->dev, irq, pxa168fb_handle_irq,
> +			       IRQF_SHARED, info->fix.id, fbi);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "unable to request IRQ\n");
>  		ret = -ENXIO;
> @@ -759,14 +761,12 @@ static int __devinit pxa168fb_probe(struct platform_device *pdev)
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "Failed to register pxa168-fb: %d\n", ret);
>  		ret = -ENXIO;
> -		goto failed_free_irq;
> +		goto failed_free_cmap;
>  	}
>  
>  	platform_set_drvdata(pdev, fbi);
>  	return 0;
>  
> -failed_free_irq:
> -	free_irq(irq, fbi);
>  failed_free_cmap:
>  	fb_dealloc_cmap(&info->cmap);
>  failed_free_clk:
> @@ -808,13 +808,10 @@ static int __devexit pxa168fb_remove(struct platform_device *pdev)
>  		fb_dealloc_cmap(&info->cmap);
>  
>  	irq = platform_get_irq(pdev, 0);
> -	free_irq(irq, fbi);
>  
>  	dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
>  				info->screen_base, info->fix.smem_start);
>  
> -	iounmap(fbi->reg_base);
> -
>  	clk_disable(fbi->clk);
>  	clk_put(fbi->clk);
>  
> 
> 

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