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@xxxxxxxxx>
---
drivers/net/usb/dm9601.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- linux-2.6.orig/drivers/net/usb/dm9601.c
+++ linux-2.6/drivers/net/usb/dm9601.c
@@ -413,6 +413,7 @@ static int dm9601_set_mac_address(struct
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)
@@ -437,12 +438,18 @@ static int dm9601_bind(struct usbnet *de
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);
--
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