net: dsa: Skip calling .port_vlan_filtering on no change
Even if VLAN filtering is global, DSA will call this callback once per each port. Drivers should not have to compare the global state with the requested change. So let DSA do it. Signed-off-by: NVladimir Oltean <olteanv@gmail.com> Reviewed-by: NAndrew Lunn <andrew@lunn.ch> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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