linux-kernel - Re: [PATCH v2 2/5] media: davinci: vpif: Convert to devm

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Date:	Sun, 26 May 2013 02:49:22 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
Cc:	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	LMML <linux-media@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] media: davinci: vpif: Convert to devm_* api

Hi Prabhakar,

Thank you for the patch.

On Saturday 25 May 2013 22:06:33 Prabhakar Lad wrote:
> From: Lad, Prabhakar <prabhakar.csengg@...il.com>
> 
> Use devm_ioremap_resource instead of reques_mem_region()/ioremap().
> This ensures more consistent error values and simplifies error paths.
> 
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> ---
>  drivers/media/platform/davinci/vpif.c |   27 ++++-----------------------
>  1 files changed, 4 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/media/platform/davinci/vpif.c
> b/drivers/media/platform/davinci/vpif.c index 761c825..164c1b7 100644
> --- a/drivers/media/platform/davinci/vpif.c
> +++ b/drivers/media/platform/davinci/vpif.c
> @@ -37,8 +37,6 @@ MODULE_LICENSE("GPL");
>  #define VPIF_CH2_MAX_MODES	(15)
>  #define VPIF_CH3_MAX_MODES	(02)
> 
> -static resource_size_t	res_len;
> -static struct resource	*res;
>  spinlock_t vpif_lock;
> 
>  void __iomem *vpif_base;
> @@ -421,23 +419,12 @@ EXPORT_SYMBOL(vpif_channel_getfid);
> 
>  static int vpif_probe(struct platform_device *pdev)
>  {
> -	int status = 0;
> +	static struct resource	*res;
> 
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!res)
> -		return -ENOENT;
> -
> -	res_len = resource_size(res);
> -
> -	res = request_mem_region(res->start, res_len, res->name);
> -	if (!res)
> -		return -EBUSY;
> -
> -	vpif_base = ioremap(res->start, res_len);
> -	if (!vpif_base) {
> -		status = -EBUSY;
> -		goto fail;
> -	}
> +	vpif_base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(vpif_base))
> +		return PTR_ERR(vpif_base);

You're loosing the request_mem_region(). You should use 
devm_request_and_ioremap() function instead of devm_ioremap_resource(). With 
that change,

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

>  	pm_runtime_enable(&pdev->dev);
>  	pm_runtime_get(&pdev->dev);
> @@ -445,17 +432,11 @@ static int vpif_probe(struct platform_device *pdev)
>  	spin_lock_init(&vpif_lock);
>  	dev_info(&pdev->dev, "vpif probe success\n");
>  	return 0;
> -
> -fail:
> -	release_mem_region(res->start, res_len);
> -	return status;
>  }
> 
>  static int vpif_remove(struct platform_device *pdev)
>  {
>  	pm_runtime_disable(&pdev->dev);
> -	iounmap(vpif_base);
> -	release_mem_region(res->start, res_len);
>  	return 0;
>  }
-- 
Regards,

Laurent Pinchart

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