net: stmmac: fix incorrect GMAC_VLAN_TAG register writting in GMAC4+
It should always do a read of current value of GMAC_VLAN_TAG instead of directly overwriting the register value. Fixes: c1be0022 ("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>
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