ipv6: convert fib6_ref to refcount_t
We suspect some issues involving fib6_ref 0 -> 1 transitions might cause strange syzbot reports. Lets convert fib6_ref to refcount_t to catch them earlier. Signed-off-by: NEric Dumazet <edumazet@google.com> Cc: Wei Wang <weiwan@google.com> Acked-by: NWei Wang <weiwan@google.com> Reviewed-by: NDavid Ahern <dsahern@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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