linux-kernel - Freescale FEC: fall back to random address

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Message-ID: <20130331210605.GA29191@amd.pavel.ucw.cz>
Date:	Sun, 31 Mar 2013 23:06:05 +0200
From:	Pavel Machek <pavel@...x.de>
To:	kernel list <linux-kernel@...r.kernel.org>,
	fabio.estevam@...escale.com, l.stach@...gutronix.de,
	Frank.Li@...escale.com, netdev@...r.kernel.org
Subject: Freescale FEC: fall back to random address

If there's no valid ethernet address, fall back to randomly generated
one.

(Yes, I need to get newer u-boot for the board, but as the only
available one is from 2009... this might be good idea).

Signed-off-by: Pavel Machek <pavel@...x.de>


index e3f3937..5a7d1e1 100644
pp--- a/drivers/net/ethernet/freescale/fec.c
+++ b/drivers/net/ethernet/freescale/fec.c
@@ -906,6 +914,16 @@ 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);
+		netdev_info(ndev, "Using random MAC address: %pM\n", iap);
+	}
+
 	memcpy(ndev->dev_addr, iap, ETH_ALEN);
 
 	/* Adjust MAC if using macaddr */

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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