lan78xx: Resolve issue with changing MAC address

[ Upstream commit 15515aaaa69659c502003926a2067ee76176148a ]

Current state for the lan78xx driver does not allow for changing the
MAC address of the interface, without either removing the module (if
you compiled it that way) or rebooting the machine.  If you attempt to
change the MAC address, ifconfig will show the new address, however,
the system/interface will not respond to any traffic using that
configuration.  A few short-term options to work around this are to
unload the module and reload it with the new MAC address, change the
interface to "promisc", or reboot with the correct configuration to
change the MAC.

This patch enables the ability to change the MAC address via fairly normal means...
ifdown <interface>
modify entry in /etc/network/interfaces OR a similar method
ifup <interface>
Then test via any network communication, such as ICMP requests to gateway.

My only test platform for this patch has been a raspberry pi model 3b+.

Signed-off-by: Jason Martinsen <jasonmartinsen@msn.com>
-----

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index e069b310d6a6bd32f03579878c7d50ccdbd65691..b62c41114e34e3c3f36d17df14a6e1b7c6ea719b 100644 (file)
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -2212,6 +2212,10 @@ static int lan78xx_set_mac_addr(struct net_device *netdev, void *p)
        ret = lan78xx_write_reg(dev, RX_ADDRL, addr_lo);
        ret = lan78xx_write_reg(dev, RX_ADDRH, addr_hi);
 
+       /* Added to support MAC address changes */
+       ret = lan78xx_write_reg(dev, MAF_LO(0), addr_lo);
+       ret = lan78xx_write_reg(dev, MAF_HI(0), addr_hi | MAF_HI_VALID_);
+
        return 0;
 }