Merge branch 'rtnetlink-fix-initial-rtnl-pushdown-fallout'

Florian Westphal says:

====================
rtnetlink: fix initial rtnl pushdown fallout

This series fixes various bugs and splats reported since the
allow-handler-to-run-with-no-rtnl series went in.

Last patch adds a script that can be used to add further
tests in case more bugs are reported.
In case you prefer reverting the original series instead of
fixing fallout I can resend this patch on its own.
====================

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