xfrm: add rcu grace period in xfrm_policy_destroy()
We will soon switch sk->sk_policy[] to RCU protection, as SYNACK packets are sent while listener socket is not locked. This patch simply adds RCU grace period before struct xfrm_policy freeing, and the corresponding rcu_head in struct xfrm_policy. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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