netdev - [PATCH 26/31]: pkt_sched: Rework {sch,tbf}_tree

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Date:	Thu, 17 Jul 2008 05:18:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
CC:	kaber@...sh.net, johannes@...solutions.net,
	linux-wireless@...r.kernel.org
Subject: [PATCH 26/31]: pkt_sched: Rework {sch,tbf}_tree_lock().


Make sch_tree_lock() lock the qdisc's root.  All of the
users hold the RTNL semaphore and the root qdisc is not
changing.

Implement tbf_tree_{lock,unlock}() simply in terms of
sch_tree_{lock,unlock}().

Signed-off-by: David S. Miller <davem@...emloft.net>
---
 include/net/sch_generic.h |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 3cc4b5c..60e1e9f 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -183,10 +183,18 @@ static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
 extern void qdisc_lock_tree(struct net_device *dev);
 extern void qdisc_unlock_tree(struct net_device *dev);
 
-#define sch_tree_lock(q)	qdisc_lock_tree(qdisc_dev(q))
-#define sch_tree_unlock(q)	qdisc_unlock_tree(qdisc_dev(q))
-#define tcf_tree_lock(tp)	qdisc_lock_tree(qdisc_dev((tp)->q))
-#define tcf_tree_unlock(tp)	qdisc_unlock_tree(qdisc_dev((tp)->q))
+static inline void sch_tree_lock(struct Qdisc *q)
+{
+	spin_lock_bh(qdisc_root_lock(q));
+}
+
+static inline void sch_tree_unlock(struct Qdisc *q)
+{
+	spin_unlock_bh(qdisc_root_lock(q));
+}
+
+#define tcf_tree_lock(tp)	sch_tree_lock((tp)->q)
+#define tcf_tree_unlock(tp)	sch_tree_unlock((tp)->q)
 
 extern struct Qdisc noop_qdisc;
 extern struct Qdisc_ops noop_qdisc_ops;
-- 
1.5.6.2.255.gbed62

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