netdev - Re: [PATCH net-next] net: fec: add fallback to random MAC address

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Message-ID: <51A8E481.802@cogentembedded.com>
Date:	Fri, 31 May 2013 21:57:21 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Lucas Stach <l.stach@...gutronix.de>
CC:	netdev@...r.kernel.org, davem@...emloft.net,
	Pavel Machek <pavel@...x.de>
Subject: Re: [PATCH net-next] net: fec: add fallback to random MAC address

Hello.

On 05/31/2013 09:22 PM, Lucas Stach wrote:

> From: Pavel Machek <pavel@...x.de>
>
> If no valid MAC address could be obtained from the hardware,
> fall back to a randomly generated one.
>
> Signed-off-by: Pavel Machek <pavel@...x.de>
> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
> ---
>   drivers/net/ethernet/freescale/fec_main.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
>
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index 9b0c647..3694a56 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -1037,6 +1037,16 @@ static void fec_get_mac(struct net_device *ndev)
>   		iap = &tmpaddr[0];
>   	}
>   
> +	/*
> +	 * 5) random mac address
> +	 */
> +	if (!is_valid_ether_addr(iap)) {
> +		/* Report it and use a random ethernet address instead */
> +		netdev_err(ndev, "Invalid MAC address: %pM\n", iap);
> +		random_ether_addr(iap);

    eth_hw_addr_random(ndev) might be a bit better -- it classifies the MAC
address in 'struct net_device' as random.

WBR, Sergei

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