bridge: vlan: fix possible null ptr derefs on port init and deinit
When a new port is being added we need to make vlgrp available after rhashtable has been initialized and when removing a port we need to flush the vlans and free the resources after we're sure noone can use the port, i.e. after it's removed from the port list and synchronize_rcu is executed. Signed-off-by: NNikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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