pkt_sched: Remove smp_wmb() in qdisc_watchdog()

While implementing a TCQ_F_THROTTLED flag there was used an smp_wmb()
in qdisc_watchdog(), but since this flag is practically used only in
sch_netem(), and since it's not even clear what reordering is avoided
here (TCQ_F_THROTTLED vs. __QDISC_STATE_SCHED?) it seems the barrier
could be safely removed.

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 0 insertions, 2 deletions

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 6bc29e8a7f32..0fc4a18fd96f 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -450,7 +450,6 @@ static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
                                                  timer);
 
         wd->qdisc->flags &= ~TCQ_F_THROTTLED;
-        smp_wmb();
         __netif_schedule(qdisc_root(wd->qdisc));
 
         return HRTIMER_NORESTART;
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 7e78f1c0f357..d876b8734848 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -266,7 +266,6 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch)
         struct netem_sched_data *q = qdisc_priv(sch);
         struct sk_buff *skb;
 
-        smp_mb();
         if (sch->flags & TCQ_F_THROTTLED)
                 return NULL;