diff options
| author | Cong Wang <xiyou.wangcong@gmail.com> | 2017-10-26 18:24:37 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-29 22:49:31 +0900 |
| commit | c2f3f31d402be4849b06282c3a5278f2865c9fcc (patch) | |
| tree | 07fa419d5a5372c2b430320e787b185d8b75ed23 /net | |
| parent | c0d378ef1266546a39f2df00a56ff1f74166a2b7 (diff) | |
| download | lwn-c2f3f31d402be4849b06282c3a5278f2865c9fcc.tar.gz lwn-c2f3f31d402be4849b06282c3a5278f2865c9fcc.zip | |
net_sched: use tcf_queue_work() in route 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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/cls_route.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c index 9ddde65915d2..4b14ccd8b8f2 100644 --- a/net/sched/cls_route.c +++ b/net/sched/cls_route.c @@ -57,7 +57,10 @@ struct route4_filter { u32 handle; struct route4_bucket *bkt; struct tcf_proto *tp; - struct rcu_head rcu; + union { + struct work_struct work; + struct rcu_head rcu; + }; }; #define ROUTE4_FAILURE ((struct route4_filter *)(-1L)) @@ -254,12 +257,22 @@ static int route4_init(struct tcf_proto *tp) return 0; } -static void route4_delete_filter(struct rcu_head *head) +static void route4_delete_filter_work(struct work_struct *work) { - struct route4_filter *f = container_of(head, struct route4_filter, rcu); + struct route4_filter *f = container_of(work, struct route4_filter, work); + rtnl_lock(); tcf_exts_destroy(&f->exts); kfree(f); + rtnl_unlock(); +} + +static void route4_delete_filter(struct rcu_head *head) +{ + struct route4_filter *f = container_of(head, struct route4_filter, rcu); + + INIT_WORK(&f->work, route4_delete_filter_work); + tcf_queue_work(&f->work); } static void route4_destroy(struct tcf_proto *tp) |