5 files changed, 43 insertions, 8 deletions

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 972378f..23b25f8 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -26,6 +26,11 @@
 #include <net/act_api.h>
 #include <net/netlink.h>
 
+static void tcf_common_free_rcu(struct rcu_head *head)
+{
+	kfree(container_of(head, struct tcf_common, tcfc_rcu));
+}
+
 void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
 {
 	unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
@@ -38,7 +43,11 @@ void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
 			write_unlock_bh(hinfo->lock);
 			gen_kill_estimator(&p->tcfc_bstats,
 					   &p->tcfc_rate_est);
-			kfree(p);
+			/*
+			 * gen_estimator est_timer() might access p->tcfc_lock
+			 * or bstats, wait a RCU grace period before freeing p
+			 */
+			call_rcu(&p->tcfc_rcu, tcf_common_free_rcu);
 			return;
 		}
 	}
diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index 50e3d94..a0593c9 100644
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -127,8 +127,7 @@ static int tcf_pedit(struct sk_buff *skb, struct tc_action *a,
 	int i, munged = 0;
 	unsigned int off;
 
-	if (!(skb->tc_verd & TC_OK2MUNGE)) {
-		/* should we set skb->cloned? */
+	if (skb_cloned(skb)) {
 		if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
 			return p->tcf_action;
 		}
diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 654f73d..537a487 100644
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -97,6 +97,11 @@ nla_put_failure:
 	goto done;
 }
 
+static void tcf_police_free_rcu(struct rcu_head *head)
+{
+	kfree(container_of(head, struct tcf_police, tcf_rcu));
+}
+
 static void tcf_police_destroy(struct tcf_police *p)
 {
 	unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
@@ -113,7 +118,11 @@ static void tcf_police_destroy(struct tcf_police *p)
 				qdisc_put_rtab(p->tcfp_R_tab);
 			if (p->tcfp_P_tab)
 				qdisc_put_rtab(p->tcfp_P_tab);
-			kfree(p);
+			/*
+			 * gen_estimator est_timer() might access p->tcf_lock
+			 * or bstats, wait a RCU grace period before freeing p
+			 */
+			call_rcu(&p->tcf_rcu, tcf_police_free_rcu);
 			return;
 		}
 	}
@@ -397,6 +406,7 @@ static void __exit
 police_cleanup_module(void)
 {
 	tcf_unregister_action(&act_police_ops);
+	rcu_barrier(); /* Wait for completion of call_rcu()'s (tcf_police_free_rcu) */
 }
 
 module_init(police_init_module);
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index a63029e..d20fcd2 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -205,7 +205,7 @@ void __qdisc_run(struct Qdisc *q)
 		}
 	}
 
-	clear_bit(__QDISC_STATE_RUNNING, &q->state);
+	qdisc_run_end(q);
 }
 
 unsigned long dev_trans_start(struct net_device *dev)
@@ -327,6 +327,24 @@ void netif_carrier_off(struct net_device *dev)
 }
 EXPORT_SYMBOL(netif_carrier_off);
 
+/**
+ * 	netif_notify_peers - notify network peers about existence of @dev
+ * 	@dev: network device
+ *
+ * Generate traffic such that interested network peers are aware of
+ * @dev, such as by generating a gratuitous ARP. This may be used when
+ * a device wants to inform the rest of the network about some sort of
+ * reconfiguration such as a failover event or virtual machine
+ * migration.
+ */
+void netif_notify_peers(struct net_device *dev)
+{
+	rtnl_lock();
+	call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
+	rtnl_unlock();
+}
+EXPORT_SYMBOL(netif_notify_peers);
+
 /* "NOOP" scheduler: the best scheduler, recommended for all interfaces
    under all circumstances. It is difficult to invent anything faster or
    cheaper.
@@ -543,6 +561,7 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 
 	INIT_LIST_HEAD(&sch->list);
 	skb_queue_head_init(&sch->q);
+	spin_lock_init(&sch->busylock);
 	sch->ops = ops;
 	sch->enqueue = ops->enqueue;
 	sch->dequeue = ops->dequeue;
@@ -779,7 +798,7 @@ static bool some_qdisc_is_busy(struct net_device *dev)
 
 		spin_lock_bh(root_lock);
 
-		val = (test_bit(__QDISC_STATE_RUNNING, &q->state) ||
+		val = (qdisc_is_running(q) ||
 		       test_bit(__QDISC_STATE_SCHED, &q->state));
 
 		spin_unlock_bh(root_lock);
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 0b52b8d..4be8d04 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1550,7 +1550,6 @@ static const struct Qdisc_class_ops htb_class_ops = {
 };
 
 static struct Qdisc_ops htb_qdisc_ops __read_mostly = {
-	.next		=	NULL,
 	.cl_ops		=	&htb_class_ops,
 	.id		=	"htb",
 	.priv_size	=	sizeof(struct htb_sched),
@@ -1561,7 +1560,6 @@ static struct Qdisc_ops htb_qdisc_ops __read_mostly = {
 	.init		=	htb_init,
 	.reset		=	htb_reset,
 	.destroy	=	htb_destroy,
-	.change		=	NULL /* htb_change */,
 	.dump		=	htb_dump,
 	.owner		=	THIS_MODULE,
 };