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| author | Florian Westphal <fw@strlen.de> | 2016-06-14 06:16:27 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-06-15 14:42:46 -0700 |
| commit | 0ee13627f963f9c5c9544ed19d82854836d5e676 (patch) | |
| tree | 608c64dece5107d154ab684fe03d1558f6e4b9b2 /net/sched | |
| parent | ebecaa6662b0a9c3590bd644a4cec6f9d96818b7 (diff) | |
| download | lwn-0ee13627f963f9c5c9544ed19d82854836d5e676.tar.gz lwn-0ee13627f963f9c5c9544ed19d82854836d5e676.zip | |
htb: call qdisc_root with rcu read lock held
saw a debug splat:
net/include/net/sch_generic.h:287 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
2 locks held by kworker/2:1/710:
#0: ("events"){.+.+.+}, at: [<ffffffff8106ca1d>]
#1: ((&q->work)){+.+...}, at: [<ffffffff8106ca1d>] process_one_work+0x14d/0x690
Workqueue: events htb_work_func
Call Trace:
[<ffffffff812dc763>] dump_stack+0x85/0xc2
[<ffffffff8109fee7>] lockdep_rcu_suspicious+0xe7/0x120
[<ffffffff814ced47>] htb_work_func+0x67/0x70
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_htb.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index d4b4218af6b1..62f9d8100c6e 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -1007,7 +1007,9 @@ static void htb_work_func(struct work_struct *work) struct htb_sched *q = container_of(work, struct htb_sched, work); struct Qdisc *sch = q->watchdog.qdisc; + rcu_read_lock(); __netif_schedule(qdisc_root(sch)); + rcu_read_unlock(); } static int htb_init(struct Qdisc *sch, struct nlattr *opt) |