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This patch removes spin_locks at CAN socket creation time by using RCU. Inspired by the discussion with Kurt van Dijck and Eric Dumazet the RCU code was partly derived from af_phonet.c Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Kurt Van Dijck <kurt.van.dijck@eia.be> Signed-off-by: David S. Miller <davem@davemloft.net>