net_sched: move dev_graft_qdisc() to sch_generic.c

It will be used in a following patch by the multiqueue qdisc.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sch_generic.h

@@ -302,6 +302,8 @@ extern void dev_init_scheduler(struct net_device *dev);
 extern void dev_shutdown(struct net_device *dev);
 extern void dev_activate(struct net_device *dev);
 extern void dev_deactivate(struct net_device *dev);
+extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
+				     struct Qdisc *qdisc);
 extern void qdisc_reset(struct Qdisc *qdisc);
 extern void qdisc_destroy(struct Qdisc *qdisc);
 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);

net/sched/sch_api.c

@@ -610,32 +610,6 @@ static u32 qdisc_alloc_handle(struct net_device *dev)
 	return i>0 ? autohandle : 0;
 }
 
-/* Attach toplevel qdisc to device queue. */
-
-static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
-				     struct Qdisc *qdisc)
-{
-	struct Qdisc *oqdisc = dev_queue->qdisc_sleeping;
-	spinlock_t *root_lock;
-
-	root_lock = qdisc_lock(oqdisc);
-	spin_lock_bh(root_lock);
-
-	/* Prune old scheduler */
-	if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1)
-		qdisc_reset(oqdisc);
-
-	/* ... and graft new one */
-	if (qdisc == NULL)
-		qdisc = &noop_qdisc;
-	dev_queue->qdisc_sleeping = qdisc;
-	rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);
-
-	spin_unlock_bh(root_lock);
-
-	return oqdisc;
-}
-
 void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
 {
 	const struct Qdisc_class_ops *cops;

net/sched/sch_generic.c

@@ -623,6 +623,31 @@ void qdisc_destroy(struct Qdisc *qdisc)
 }
 EXPORT_SYMBOL(qdisc_destroy);
 
+/* Attach toplevel qdisc to device queue. */
+struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
+			      struct Qdisc *qdisc)
+{
+	struct Qdisc *oqdisc = dev_queue->qdisc_sleeping;
+	spinlock_t *root_lock;
+
+	root_lock = qdisc_lock(oqdisc);
+	spin_lock_bh(root_lock);
+
+	/* Prune old scheduler */
+	if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1)
+		qdisc_reset(oqdisc);
+
+	/* ... and graft new one */
+	if (qdisc == NULL)
+		qdisc = &noop_qdisc;
+	dev_queue->qdisc_sleeping = qdisc;
+	rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);
+
+	spin_unlock_bh(root_lock);
+
+	return oqdisc;
+}
+
 static void attach_one_default_qdisc(struct net_device *dev,
 				     struct netdev_queue *dev_queue,
 				     void *_unused)