ipv6: addrconf: do not block BH in ipv6_chk_addr_and_flags()
rcu_read_lock() is enough here, as inet6_ifa_finish_destroy() uses kfree_rcu() Signed-off-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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