
It should always do a read of current value of GMAC_VLAN_TAG instead of
directly overwriting the register value.
Fixes: c1be0022df
("net: stmmac: Add VLAN HASH filtering support in GMAC4+")
Signed-off-by: Tan, Tee Min <tee.min.tan@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>