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net_sched: fix call_rcu() race on act_sample module removal 

Similar to commit c78e1746d3
("net: sched: fix call_rcu() race on classifier module unloads"),
we need to wait for flying RCU callback tcf_sample_cleanup_rcu().

Cc: Yotam Gigi <yotamg@mellanox.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2017-10-26 18:24:41 -07:00 committed by David S. Miller
parent 2d132eba1d
commit 46e235c15c
1 changed files with 1 additions and 0 deletions
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net/sched/act_sample.c
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@ -264,6 +264,7 @@ static int __init sample_init_module(void)
static void __exit sample_cleanup_module(void)
{
rcu_barrier();
tcf_unregister_action(&act_sample_ops, &sample_net_ops);
}