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+++ This bug was initially created as a clone of Bug #1640875 +++

Description of problem:
Issue: https://github.com/openvswitch/ovs-issues/issues/153
Copied from the github issue: https://github.com/openvswitch/ovs/commit/9006428ea5f3ac4526aefd3f66ef6f11d1dbe1cd

Until now, OVS did multicast snooping outputs holding the read-lock on
the mcast_snooping object.  This could recurse via a patch port to try to
take the write-lock on the same object, which deadlocked.  This patch fixes
the problem, by releasing the read-lock before doing any outputs.

It would probably be better to use RCU for mcast_snooping.  That would be
a bigger patch and less suitable for backporting.

Version-Release number of selected component (if applicable):
2.10

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
Creating this BZ to address customer concern about upstream issue that has recently been patched. Looking to backport the fix into RHEL OvS release for OpenStack.