ip6mr: do not acquire mrt_lock before calling ip6mr_cache_unresolved
rcu_read_lock() protection is good enough. ip6mr_cache_unresolved() uses a dedicated spinlock (mfc_unres_lock) Signed-off-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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