geneve: avoid using stale geneve socket.
This patch is similar to earlier vxlan patch. Geneve device close operation frees geneve socket. This operation can race with geneve-xmit function which dereferences geneve socket. Following patch uses RCU mechanism to avoid this situation. Signed-off-by: NPravin B Shelar <pshelar@ovn.org> Acked-by: NJohn W. Linville <linville@tuxdriver.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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