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authorPablo Bitton <pablo.bitton@gmail.com>2009-07-07 19:11:10 -0700
committerDavid S. Miller <davem@davemloft.net>2009-07-08 10:46:44 -0700
commit64c8165b44a91c09b19afb4110610ed242286639 (patch)
treeb7e4754f6280248b5444d4ff908c29684307ca11 /drivers
parent19e588e7d156cc4415585edd8c27c3075f62eaf8 (diff)
davinci_emac: fix kernel oops when changing MAC address while interface is down
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] Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/davinci_emac.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index 2df8fb0af701..12fd446f9895 100644
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -1820,11 +1820,19 @@ static int emac_dev_setmac_addr(struct net_device *ndev, void *addr)
struct device *emac_dev = &priv->ndev->dev;
struct sockaddr *sa = addr;
+ 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 %pM\n",