commit a159d3c4b8291998c018f0dbddd4678315264a1e
author Cong Wang <xiyou.wangcong@gmail.com> Wed Nov 01 10:23:49 2017 -0700
committer David S. Miller <davem@davemloft.net> Fri Nov 03 10:30:38 2017 +0900
tree bbc6afb3b37bb06103e40b963eca79685bc49768
parent 74784da82ff74379d0583a3ffe42835888705ac7

net_sched: acquire RTNL in tc_action_net_exit()

I forgot to acquire RTNL in tc_action_net_exit()
which leads that action ops->cleanup() is not always
called with RTNL. This usually is not a big deal because
this function is called after all netns refcnt are gone,
but given RTNL protects more than just actions, add it
for safety and consistency.

Also add an assertion to catch other potential bugs.

Fixes: ddf97ccdd7cb ("net_sched: add network namespace support for tc actions")
Reported-by: Lucas Bates <lucasb@mojatatu.com>
Tested-by: Lucas Bates <lucasb@mojatatu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>