linux-kernel - Re: [PATCH] can: export a safe netdev

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Message-ID: <20120910182929.GC2006@gmail.com>
Date:	Mon, 10 Sep 2012 20:29:29 +0200
From:	Fabio Baltieri <fabio.baltieri@...il.com>
To:	Oliver Hartkopp <socketcan@...tkopp.net>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	linux-kernel@...r.kernel.org, linux-can@...r.kernel.org
Subject: Re: [PATCH] can: export a safe netdev_priv wrapper for candev

Hi Kurt,

On Mon, Sep 10, 2012 at 04:25:07PM +0200, Kurt Van Dijck wrote:
> can: export a safe netdev_priv wrapper for candev
> 
> In net_device notifier calls, it was impossible to determine
> if a CAN device is based on candev in a safe way.
> This patch adds such test in order to access candev storage
> from within those notifiers.
> 
> Signed-off-by: Kurt Van Dijck <kurt.van.dijck@....be>
> 
> diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
> index 963e2cc..6c1e704 100644
> --- a/drivers/net/can/dev.c
> +++ b/drivers/net/can/dev.c
> @@ -795,6 +795,18 @@ void unregister_candev(struct net_device *dev)
>  }
>  EXPORT_SYMBOL_GPL(unregister_candev);
>  
> +/*
> + * Test if a network device is a candev based device
> + * and return the can_priv* if so.
> + */
> +struct can_priv *safe_candev_priv(struct net_device *dev)
> +{
> +	if ((dev->type != ARPHRD_CAN) || (dev->rtnl_link_ops != &can_link_ops))
> +		return NULL;
> +
> +	return netdev_priv(dev);
> +}
> +

No EXPORT_SYMBOL_GPL here?

Looks good to me a part from that.

Fabio

-- 
Fabio Baltieri
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