Jakub Kicinski says:
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VXLAN/geneve RCU fixes
VXLAN and GENEVE need to take RCU lock explicitly because TX path
only has the _bh() flavour of RCU locked. Making the reconfiguration
path wait for both normal and _bh() RCU would be bigger hassle so
just acquire the lock, as suggested by Pravin:
https://www.mail-archive.com/netdev@vger.kernel.org/msg155583.html
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Signed-off-by: David S. Miller <davem@davemloft.net>