Most of the support was already there.  The only thing that was missing
was the call to set the flag.  Add this call.
Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
        br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
        br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
        br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
+       br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
 
        if (tb[IFLA_BRPORT_COST]) {
                err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));