[PATCH v2.1] davinci_emac: fix kernel oops when changing MAC address while interface is down

[Pablo Bitton <pablo.bitton@gmail.com>]

Check that network interface is running before changing its MAC address.
Otherwise, rxch is accessed when it's NULL - causing a kernel oops.
Moreover, check that the new MAC address is valid.

Signed-off-by: Pablo Bitton <pablo.bitton@gmail.com>
Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Tested-by: Chaithrika U S <chaithrika@ti.com>
[tested on DM6467 EVM]

---
 drivers/net/davinci_emac.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index cf689a0..dddb2b9 100644
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -1821,11 +1821,19 @@ static int emac_dev_setmac_addr(struct net_device *ndev, void *addr)
 	struct sockaddr *sa = addr;
 	DECLARE_MAC_BUF(mac);
 
+	if (!is_valid_ether_addr(sa->sa_data))
+		return -EINVAL;
+
 	/* Store mac addr in priv and rx channel and set it in EMAC hw */
 	memcpy(priv->mac_addr, sa->sa_data, ndev->addr_len);
-	memcpy(rxch->mac_addr, sa->sa_data, ndev->addr_len);
 	memcpy(ndev->dev_addr, sa->sa_data, ndev->addr_len);
-	emac_setmac(priv, EMAC_DEF_RX_CH, rxch->mac_addr);
+
+	/* If the interface is down - rxch is NULL. */
+	/* MAC address is configured only after the interface is enabled. */
+	if (netif_running(ndev)) {
+		memcpy(rxch->mac_addr, sa->sa_data, ndev->addr_len);
+		emac_setmac(priv, EMAC_DEF_RX_CH, rxch->mac_addr);
+	}
 
 	if (netif_msg_drv(priv))
 		dev_notice(emac_dev, "DaVinci EMAC: emac_dev_setmac_addr %s\n",
-- 
1.5.4.3