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Hi,

I'm not sure if this question has been asked, but I wonder what is the
purpose to have the following function in ovs, linuxbridge and ml2 plugins.

disable_security_group_extension_if_noop_driver()

With this logic, if I set neutron to use NOOP firewall, creating a Nova
instance will fail, because the 'security_group' resource doesn't exist.

If I comment out this line, set firewall driver in both Neutron and Nova to
be NOOP driver, everything seems working fine.

Thanks,
Gary
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