linux-kernel - [PATCH v2 net-next] sky2: use random address if EEPROM is bad

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Message-Id: <1439303756-30333-1-git-send-email-Liviu.Dudau@arm.com>
Date:	Tue, 11 Aug 2015 15:35:56 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Stephen Hemminger <stephen@...workplumber.org>,
	Florian Fainelli <f.fainelli@...il.com>
Cc:	Mirko Lindner <mlindner@...vell.com>,
	Ryan Harkin <ryan.harkin@...aro.org>,
	netdev <netdev@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 net-next] sky2: use random address if EEPROM is bad

On some embedded systems the EEPROM does not contain a valid MAC address.
In that case it is better to fallback to a generated mac address and
let init scripts fix the value later.

Reported-by: Liviu Dudau <Liviu.Dudau@....com>
Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
[Changed handcoded setup to use eth_hw_addr_random() instead]
Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
---
I have tested this on my Juno platform and I can successfully do an nfsroot boot.

Best regards,
Liviu

 drivers/net/ethernet/marvell/sky2.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
index d9f4498..c309879 100644
--- a/drivers/net/ethernet/marvell/sky2.c
+++ b/drivers/net/ethernet/marvell/sky2.c
@@ -4819,6 +4819,13 @@ static struct net_device *sky2_init_netdev(struct sky2_hw *hw, unsigned port,
 		memcpy_fromio(dev->dev_addr, hw->regs + B2_MAC_1 + port * 8,
 			      ETH_ALEN);
 
+	/* if the address is invalid, use a random value */
+	if (!is_valid_ether_addr(dev->dev_addr)) {
+		netdev_warn(dev,
+			"Invalid MAC address, defaulting to random\n");
+		eth_hw_addr_random(dev);
+	}
+
 	return dev;
 }
 
-- 
2.4.6

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