linux-kernel - Re: [PATCH V5 2/3] bfin_can: rewrite the driver into common style with MMU

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Date:	Thu, 05 Feb 2015 12:05:31 +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,
	linux-devel@...log.com
Subject: Re: [PATCH V5 2/3] bfin_can: rewrite the driver into common style
 with MMU

On 02/05/2015 11:44 AM, Aaron Wu wrote:
> Rewrite the blackfin CAN driver into more common style in three ways:
> part 1/3: rewrite blackfin style of read/write into common readw/writew
> part 2/3: introduce ioremap to be compitable with MMU enabled arch
> part 3/3: merge the header file from the blackfin arch dependent
> location to driver code directly, note the original copy of more completed
> bfin_can.h in arch depentdent location is reserved for reg test purpose
> 
> V5 changes: merge contents of header file into drivere code in patch 3/3
> V4 changes: remove unused variable in patch 2/3
> V3 changes: remove redundant cast in patch 2/3
> V2 changes: split patch into two parts
> V1 changes: rewrite code into common style
> 
> Signed-off-by: Aaron Wu <Aaron.wu@...log.com>
> ---
>  drivers/net/can/bfin_can.c |   22 ++++++++--------------
>  1 file changed, 8 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
> index 0a5eff4..0209c14 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(priv->membase)) {
> +		dev_err(&pdev->dev, "Cannot map IO\n");

devm_ioremap_resource() already prints an error message.

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