linux-kernel - Re: [PATCH] can: c_can: convert to use devm * api

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Message-ID: <53A6B658.6030709@pengutronix.de>
Date:	Sun, 22 Jun 2014 12:56:24 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	"Lad, Prabhakar" <prabhakar.csengg@...il.com>,
	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	Wolfgang Grandegger <wg@...ndegger.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] can: c_can: convert to use devm * api

On 06/20/2014 01:59 PM, Lad, Prabhakar wrote:
> From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
> 
> this patch uses devm_* APIs as they are device managed
> and make code simpler.
> 
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>

Thanks for the patch. Applied to can-next with minor change (see inline).

> ---
>  Note: This patch is compile tested only.
>  
>  drivers/net/can/c_can/c_can_platform.c | 41 ++++++++--------------------------
>  1 file changed, 9 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
> index 1df0b32..e0dcbcf 100644
> --- a/drivers/net/can/c_can/c_can_platform.c
> +++ b/drivers/net/can/c_can/c_can_platform.c
> @@ -157,40 +157,31 @@ static int c_can_plat_probe(struct platform_device *pdev)
>  	}
>  
>  	/* get the appropriate clk */
> -	clk = clk_get(&pdev->dev, NULL);
> +	clk = devm_clk_get(&pdev->dev, NULL);
>  	if (IS_ERR(clk)) {
> -		dev_err(&pdev->dev, "no clock defined\n");
> -		ret = -ENODEV;
> +		ret = PTR_ERR(clk);
>  		goto exit;
>  	}
>  
>  	/* get the platform data */
>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	irq = platform_get_irq(pdev, 0);
> -	if (!mem || irq <= 0) {
> -		ret = -ENODEV;
> -		goto exit_free_clk;
> -	}
> -
> -	if (!request_mem_region(mem->start, resource_size(mem),
> -				KBUILD_MODNAME)) {
> -		dev_err(&pdev->dev, "resource unavailable\n");
> +	if (irq <= 0) {
>  		ret = -ENODEV;
> -		goto exit_free_clk;
> +		goto exit;
>  	}
>  
> -	addr = ioremap(mem->start, resource_size(mem));
> -	if (!addr) {
> -		dev_err(&pdev->dev, "failed to map can port\n");
> -		ret = -ENOMEM;
> -		goto exit_release_mem;

I've moved the mem = platform_get_resource() for slightly better
readability here....

> +	addr = devm_ioremap_resource(&pdev->dev, mem);
> +	if (IS_ERR(addr)) {
> +		ret =  PTR_ERR(addr);
> +		goto exit;
>  	}

Thanks,
Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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