atl1: save mac address on remove

Some atl1 boards get their MAC address written directly to the register
by the BIOS during POST, rather than storing it in EEPROM that's
accessible to the driver.  If the MAC register on one of these boards
is changed and then the module is unloaded, the permanent MAC address
will be forgotten until the box is rebooted.  We should save the
permanent address during removal if we've been messing with it.

Signed-off-by: Chris Snook <csnook@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/atl1/atl1_main.c b/drivers/net/atl1/atl1_main.c
index dee3638ad744eb163713e4cd4c4a93577a7696c7..8606eac5bec88215c398c8d36a8afd0faccac8c7 100644 (file)
--- a/drivers/net/atl1/atl1_main.c
+++ b/drivers/net/atl1/atl1_main.c
@@ -2320,6 +2320,16 @@ static void __devexit atl1_remove(struct pci_dev *pdev)
                return;
 
        adapter = netdev_priv(netdev);
+
+       /* Some atl1 boards lack persistent storage for their MAC, and get it
+        * from the BIOS during POST.  If we've been messing with the MAC
+        * address, we need to save the permanent one.
+        */
+       if (memcmp(adapter->hw.mac_addr, adapter->hw.perm_mac_addr, ETH_ALEN)) {
+               memcpy(adapter->hw.mac_addr, adapter->hw.perm_mac_addr, ETH_ALEN);
+               atl1_set_mac_addr(&adapter->hw);
+       }
+
        iowrite16(0, adapter->hw.hw_addr + REG_GPHY_ENABLE);
        unregister_netdev(netdev);
        pci_iounmap(pdev, adapter->hw.hw_addr);