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Message-ID: <20081222075705.GA4419@ff.dom.local>
Date: Mon, 22 Dec 2008 07:57:05 +0000
From: Jarek Poplawski <jarkao2@...il.com>
To: David Miller <davem@...emloft.net>
Cc: Stephen Hemminger <shemminger@...tta.com>, netdev@...r.kernel.org
Subject: [PATCH v2] pkt_sched: Remove smp_wmb() in qdisc_watchdog()
On Fri, Dec 19, 2008 at 06:18:51PM -0800, Stephen Hemminger wrote:
...
> The barrier was copied from earlier version of tbf is unnecessary.
So I resend this patch with only a changelog updated
Thanks,
Jarek P.
---------->
While implementing a TCQ_F_THROTTLED flag there was used an smp_wmb()
in qdisc_watchdog(). Stephen Hemminger acknowledged the barrier was
copied from earlier version of tbf and is unnecessaray, so it's
removed here.
Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
---
net/sched/sch_api.c | 1 -
net/sched/sch_netem.c | 1 -
2 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 6bc29e8..0fc4a18 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 7e78f1c..d876b87 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;
--
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