net: stmmac: xgmac: fix incorrect XGMAC_VLAN_TAG register writting
We should always do a read of current value of XGMAC_VLAN_TAG instead of directly overwriting the register value. Fixes: 3cd1cfcb ("net: stmmac: Implement VLAN Hash Filtering in XGMAC") Signed-off-by: NOng Boon Leong <boon.leong.ong@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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