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There is a path when an assetion in dev_unicast_sync() appears. igmp6_group_added -> dev_mc_add -> __dev_set_rx_mode -> -> vlan_dev_set_rx_mode -> dev_unicast_sync Therefore we cannot protect this list with rtnl. This patch restores the original protecting this list with spinlock. Signed-off-by: Jiri Pirko <jpirko@redhat.com> Tested-by: Meelis Roos <mroos@linux.ee> Signed-off-by: David S. Miller <davem@davemloft.net>