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authorWu Fengguang <fengguang.wu@intel.com>2009-01-06 10:55:10 -0800
committerDavid S. Miller <davem@davemloft.net>2009-01-06 10:55:32 -0800
commit20f10aa07d8d4d43ae8e129c39a84e1670b0d5ab (patch)
treedb283b501631fbf6d21b402c580d7dc86809a4a4 /drivers/net/usb/dm9601.c
parente1c096e251e52773afeffbbcb74d0a072be47ea3 (diff)
dm9601: handle corrupt mac address
Some cheap devices ship with dangling EEPROM pins! They always return invalid address ff:ff:ff:ff:ff:ff. Inherit the auto-generated address in this case, so that these products can work with zero configuration. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/usb/dm9601.c')
-rw-r--r--drivers/net/usb/dm9601.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/net/usb/dm9601.c b/drivers/net/usb/dm9601.c
index edd244f3acb..69a0436d394 100644
--- a/drivers/net/usb/dm9601.c
+++ b/drivers/net/usb/dm9601.c
@@ -414,6 +414,7 @@ static int dm9601_set_mac_address(struct net_device *net, void *p)
static int dm9601_bind(struct usbnet *dev, struct usb_interface *intf)
{
int ret;
+ u8 mac[ETH_ALEN];
ret = usbnet_get_endpoints(dev, intf);
if (ret)
@@ -438,12 +439,18 @@ static int dm9601_bind(struct usbnet *dev, struct usb_interface *intf)
udelay(20);
/* read MAC */
- if (dm_read(dev, DM_PHY_ADDR, ETH_ALEN, dev->net->dev_addr) < 0) {
+ if (dm_read(dev, DM_PHY_ADDR, ETH_ALEN, mac) < 0) {
printk(KERN_ERR "Error reading MAC address\n");
ret = -ENODEV;
goto out;
}
+ /*
+ * Overwrite the auto-generated address only with good ones.
+ */
+ if (is_valid_ether_addr(mac))
+ memcpy(dev->net->dev_addr, mac, ETH_ALEN);
+
/* power up phy */
dm_write_reg(dev, DM_GPR_CTRL, 1);
dm_write_reg(dev, DM_GPR_DATA, 0);