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[Russell Bryant <1276391@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1276391

Title:
  ML2 MechanismDriver.bind_port() called inside transaction

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  The ML2 plugin calls the bind_port() operation  on the registered
  mechanism drivers in order to establish a binding for a neutron port
  (i.e. determining the binding:vif_type and what network segment is
  being used). It currently makes these calls from within a DB
  transaction. This is fine for mechanism drivers such as those for the
  L2 agents that base their binding decision solely on information from
  the neutron DB. But if mechanism drivers for controllers or devices
  need to make remote calls to determine if binding is possible, they
  should not do this from within a DB transaction. Therefore, the
  bind_port() call must be made by the plugin outside of any enclosing
  DB transaction, and the drivers should manage any needed DB
  transactions themselves.

  Once [re]binding is moved outside the DB transaction that triggers it,
  the possibility that multiple threads or processes will concurrently
  try to bind the same port must also be addressed.

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