Merge branch 'net_sched-fix-filter-chain-reference-counting'

Cong Wang says:

====================
net_sched: fix filter chain reference counting

This patchset fixes tc filter chain reference counting and nasty race
conditions with RCU callbacks. Please see each patch for details.

v3: Rebase on the latest -net
    Add code comment in patch 1
    Improve comment and changelog for patch 2
    Add patch 3

v2: Add patch 1
    Get rid of more ugly code in patch 2
====================

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