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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2020-05-26 21:35:27 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-27 15:05:49 -0700 |
| commit | 759ae57f1b7bf5dfea1816f786f568d69efe34e2 (patch) | |
| tree | 05d0ac479515a9cf925dcefa78718641e8165d5b /net/sched | |
| parent | 70f50965338a12e17454c31ad5ece27069719358 (diff) | |
| download | linux-759ae57f1b7bf5dfea1816f786f568d69efe34e2.tar.gz linux-759ae57f1b7bf5dfea1816f786f568d69efe34e2.tar.bz2 linux-759ae57f1b7bf5dfea1816f786f568d69efe34e2.zip | |
net_sched: get rid of unnecessary dev_qdisc_reset()
Resetting old qdisc on dev_queue->qdisc_sleeping in
dev_qdisc_reset() is redundant, because this qdisc,
even if not same with dev_queue->qdisc, is reset via
qdisc_put() right after calling dev_graft_qdisc() when
hitting refcnt 0.
This is very easy to observe with qdisc_reset() tracepoint
and stack traces.
Reported-by: Václav Zindulka <vaclav.zindulka@tlapnet.cz>
Tested-by: Václav Zindulka <vaclav.zindulka@tlapnet.cz>
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>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_generic.c | 16 |
1 files changed, 0 insertions, 16 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index d13e27467470..b19a0021a0bd 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -1191,16 +1191,6 @@ static bool some_qdisc_is_busy(struct net_device *dev) return false; } -static void dev_qdisc_reset(struct net_device *dev, - struct netdev_queue *dev_queue, - void *none) -{ - struct Qdisc *qdisc = dev_queue->qdisc_sleeping; - - if (qdisc) - qdisc_reset(qdisc); -} - /** * dev_deactivate_many - deactivate transmissions on several devices * @head: list of devices to deactivate @@ -1237,12 +1227,6 @@ void dev_deactivate_many(struct list_head *head) */ schedule_timeout_uninterruptible(1); } - /* The new qdisc is assigned at this point so we can safely - * unwind stale skb lists and qdisc statistics - */ - netdev_for_each_tx_queue(dev, dev_qdisc_reset, NULL); - if (dev_ingress_queue(dev)) - dev_qdisc_reset(dev, dev_ingress_queue(dev), NULL); } } |