Re: [PATCH 2/2] ASoC: samsung-ac97: Convert to devm_ioremap_resource()

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On Wednesday, June 26, 2013 6:38 PM, Mark Brown wrote:
> 
> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
> ---
>  sound/soc/samsung/ac97.c | 22 +++-------------------
>  1 file changed, 3 insertions(+), 19 deletions(-)
> 
> diff --git a/sound/soc/samsung/ac97.c b/sound/soc/samsung/ac97.c
> index 1c85999..3e6a1d2 100644
> --- a/sound/soc/samsung/ac97.c
> +++ b/sound/soc/samsung/ac97.c
> @@ -417,8 +417,8 @@ static int s3c_ac97_probe(struct platform_device *pdev)
>  		return -ENXIO;
>  	}
> 
> -	if (!request_mem_region(mem_res->start,
> -				resource_size(mem_res), "ac97")) {
> +	s3c_ac97.regs = devm_ioremap_resource(&pdev->dev, mem_res);
> +	if (!s3c_ac97.regs) {
>  		dev_err(&pdev->dev, "Unable to request register region\n");
>  		return -EBUSY;

CC'ed Thierry Reding, Sachin Kamat,

According to the comment of devm_ioremap_resource(), (lib/devres.c)

 * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
 * on failure. Usage example:
 *
 *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 *      base = devm_ioremap_resource(&pdev->dev, res);
 *      if (IS_ERR(base))
 *              return PTR_ERR(base);
 */

Thus, the following would be better.

+	s3c_ac97.regs = devm_ioremap_resource(&pdev->dev, mem_res);
+	if (IS_ERR(s3c_ac97.regs))
+ 		return PTR_ERR(s3c_ac97.regs);


Best regards,
Jingoo Han

>  	}
> @@ -433,13 +433,6 @@ static int s3c_ac97_probe(struct platform_device *pdev)
>  	init_completion(&s3c_ac97.done);
>  	mutex_init(&s3c_ac97.lock);
> 
> -	s3c_ac97.regs = ioremap(mem_res->start, resource_size(mem_res));
> -	if (s3c_ac97.regs == NULL) {
> -		dev_err(&pdev->dev, "Unable to ioremap register region\n");
> -		ret = -ENXIO;
> -		goto err1;
> -	}
> -
>  	s3c_ac97.ac97_clk = devm_clk_get(&pdev->dev, "ac97");
>  	if (IS_ERR(s3c_ac97.ac97_clk)) {
>  		dev_err(&pdev->dev, "ac97 failed to get ac97_clock\n");
> @@ -481,16 +474,13 @@ err4:
>  err3:
>  	clk_disable_unprepare(s3c_ac97.ac97_clk);
>  err2:
> -	iounmap(s3c_ac97.regs);
> -err1:
> -	release_mem_region(mem_res->start, resource_size(mem_res));
> 
>  	return ret;
>  }
> 
>  static int s3c_ac97_remove(struct platform_device *pdev)
>  {
> -	struct resource *mem_res, *irq_res;
> +	struct resource *irq_res;
> 
>  	asoc_dma_platform_unregister(&pdev->dev);
>  	snd_soc_unregister_component(&pdev->dev);
> @@ -501,12 +491,6 @@ static int s3c_ac97_remove(struct platform_device *pdev)
> 
>  	clk_disable_unprepare(s3c_ac97.ac97_clk);
> 
> -	iounmap(s3c_ac97.regs);
> -
> -	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (mem_res)
> -		release_mem_region(mem_res->start, resource_size(mem_res));
> -
>  	return 0;
>  }
> 
> --
> 1.8.3.1
> 
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