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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2017-10-26 18:24:32 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-29 22:49:31 +0900 |
| commit | 94cdb47566b799649e996e1fb9de2a503dada763 (patch) | |
| tree | 1cec11723f3e5111cfadab2b6ff9f9536dda8d5e | |
| parent | b1b5b04fdb6da262aef37ef83b9f2e41326720ef (diff) | |
| download | linux-stable-94cdb47566b799649e996e1fb9de2a503dada763.tar.gz linux-stable-94cdb47566b799649e996e1fb9de2a503dada763.tar.bz2 linux-stable-94cdb47566b799649e996e1fb9de2a503dada763.zip | |
net_sched: use tcf_queue_work() in flow filter
Defer the tcf_exts_destroy() in RCU callback to
tc filter workqueue and get RTNL lock.
Reported-by: Chris Mi <chrism@mellanox.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: John Fastabend <john.fastabend@gmail.com>
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>
| -rw-r--r-- | net/sched/cls_flow.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c index 2a3a60ec5b86..67f3a2af6aab 100644 --- a/net/sched/cls_flow.c +++ b/net/sched/cls_flow.c @@ -57,7 +57,10 @@ struct flow_filter { u32 divisor; u32 baseclass; u32 hashrnd; - struct rcu_head rcu; + union { + struct work_struct work; + struct rcu_head rcu; + }; }; static inline u32 addr_fold(void *addr) @@ -369,14 +372,24 @@ static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = { [TCA_FLOW_PERTURB] = { .type = NLA_U32 }, }; -static void flow_destroy_filter(struct rcu_head *head) +static void flow_destroy_filter_work(struct work_struct *work) { - struct flow_filter *f = container_of(head, struct flow_filter, rcu); + struct flow_filter *f = container_of(work, struct flow_filter, work); + rtnl_lock(); del_timer_sync(&f->perturb_timer); tcf_exts_destroy(&f->exts); tcf_em_tree_destroy(&f->ematches); kfree(f); + rtnl_unlock(); +} + +static void flow_destroy_filter(struct rcu_head *head) +{ + struct flow_filter *f = container_of(head, struct flow_filter, rcu); + + INIT_WORK(&f->work, flow_destroy_filter_work); + tcf_queue_work(&f->work); } static int flow_change(struct net *net, struct sk_buff *in_skb, |