Comment 1 for bug 1362194

Here's the patch which added the lock to _sync_power_states:

https://review.openstack.org/#/c/103174/

In the first version I pushed, I left the skip logic outside the lock for that reason -- but I got convinced otherwise. I think you're right that it could be moved outside the lock as it was read from the database before the lock (object isn't refreshed) so I think maybe the lock isn't helping anything there.