linux-kernel - Re: [PATCH V2 2/2] bfin_can: rewrite the driver to support the common

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Date:	Thu, 08 Jan 2015 09:59:35 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Aaron Wu <Aaron.wu@...log.com>, wg@...ndegger.com,
	linux-can@...r.kernel.org, linux-kernel@...r.kernel.org
CC:	adi-buildroot-devel@...ts.sourceforge.net
Subject: Re: [PATCH V2 2/2] bfin_can: rewrite the driver to support the common

On 01/08/2015 07:57 AM, Aaron Wu wrote:
> Rewrite the driver to comply to common style with MMU 
> 
> Signed-off-by: Aaron Wu <Aaron.wu@...log.com>

Can you please rephrase the subject into a more complete English
sentence. You may use something like "convert driver to use
devm_ioremap_resource()"

> ---
>  drivers/net/can/bfin_can.c |   21 ++++++++-------------
>  1 file changed, 8 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
> index 0a5eff4..1d116a7 100644
> --- a/drivers/net/can/bfin_can.c
> +++ b/drivers/net/can/bfin_can.c
> @@ -551,16 +551,10 @@ static int bfin_can_probe(struct platform_device *pdev)
>  		goto exit;
>  	}
>  
> -	if (!request_mem_region(res_mem->start, resource_size(res_mem),
> -				dev_name(&pdev->dev))) {
> -		err = -EBUSY;
> -		goto exit;
> -	}
> -
>  	/* request peripheral pins */
>  	err = peripheral_request_list(pdata, dev_name(&pdev->dev));
>  	if (err)
> -		goto exit_mem_release;
> +		goto exit;
>  
>  	dev = alloc_bfin_candev();
>  	if (!dev) {
> @@ -569,7 +563,13 @@ static int bfin_can_probe(struct platform_device *pdev)
>  	}
>  
>  	priv = netdev_priv(dev);
> -	priv->membase = (void __iomem *)res_mem->start;
> +
> +	priv->membase = devm_ioremap_resource(&pdev->dev, res_mem);
> +	if (IS_ERR((void *)priv->membase)) {
Is this cast needed?
> +		dev_err(&pdev->dev, "Cannot map IO\n");
> +		return PTR_ERR((void *)priv->membase);
Is this cast needed?
> +	}
> +
>  	priv->rx_irq = rx_irq->start;
>  	priv->tx_irq = tx_irq->start;
>  	priv->err_irq = err_irq->start;
> @@ -601,8 +601,6 @@ exit_candev_free:
>  	free_candev(dev);
>  exit_peri_pin_free:
>  	peripheral_free_list(pdata);
> -exit_mem_release:
> -	release_mem_region(res_mem->start, resource_size(res_mem));
>  exit:
>  	return err;
>  }
> @@ -617,9 +615,6 @@ static int bfin_can_remove(struct platform_device *pdev)
>  
>  	unregister_candev(dev);
>  
> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	release_mem_region(res->start, resource_size(res));
> -
>  	peripheral_free_list(priv->pin_list);
>  
>  	free_candev(dev);
> 

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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