Merge branch 'tipc-topology-cleanup'

Ying Xue says:

====================
tipc: cleanup topology server

Not only function names declared in subscr.c are very confused, but
also topology server's locking policy is not designed very well, for
instance, usually leading to panic in some special corner cases.

In this series, we attempt to eliminate the confusion of function names
and simplify topology server's locking policy to solve above mentioned
issues. More importantly, the change will make relevant code easily
understandable and maintainable.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>