1 files changed, 20 insertions, 10 deletions

diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index f6803e1d6783..ec757f66896a 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -174,7 +174,8 @@ int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
 	int ret = NETDEV_TX_BUSY;
 
 	/* And release qdisc */
-	spin_unlock(root_lock);
+	if (root_lock)
+		spin_unlock(root_lock);
 
 	/* Note that we validate skb (GSO, checksum, ...) outside of locks */
 	if (validate)
@@ -187,10 +188,13 @@ int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
 
 		HARD_TX_UNLOCK(dev, txq);
 	} else {
-		spin_lock(root_lock);
+		if (root_lock)
+			spin_lock(root_lock);
 		return qdisc_qlen(q);
 	}
-	spin_lock(root_lock);
+
+	if (root_lock)
+		spin_lock(root_lock);
 
 	if (dev_xmit_complete(ret)) {
 		/* Driver sent out skb successfully or skb was consumed */
@@ -231,9 +235,9 @@ int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
  */
 static inline int qdisc_restart(struct Qdisc *q, int *packets)
 {
+	spinlock_t *root_lock = NULL;
 	struct netdev_queue *txq;
 	struct net_device *dev;
-	spinlock_t *root_lock;
 	struct sk_buff *skb;
 	bool validate;
 
@@ -242,7 +246,9 @@ static inline int qdisc_restart(struct Qdisc *q, int *packets)
 	if (unlikely(!skb))
 		return 0;
 
-	root_lock = qdisc_lock(q);
+	if (!(q->flags & TCQ_F_NOLOCK))
+		root_lock = qdisc_lock(q);
+
 	dev = qdisc_dev(q);
 	txq = skb_get_tx_queue(dev, skb);
 
@@ -880,14 +886,18 @@ static bool some_qdisc_is_busy(struct net_device *dev)
 
 		dev_queue = netdev_get_tx_queue(dev, i);
 		q = dev_queue->qdisc_sleeping;
-		root_lock = qdisc_lock(q);
 
-		spin_lock_bh(root_lock);
+		if (q->flags & TCQ_F_NOLOCK) {
+			val = test_bit(__QDISC_STATE_SCHED, &q->state);
+		} else {
+			root_lock = qdisc_lock(q);
+			spin_lock_bh(root_lock);
 
-		val = (qdisc_is_running(q) ||
-		       test_bit(__QDISC_STATE_SCHED, &q->state));
+			val = (qdisc_is_running(q) ||
+			       test_bit(__QDISC_STATE_SCHED, &q->state));
 
-		spin_unlock_bh(root_lock);
+			spin_unlock_bh(root_lock);
+		}
 
 		if (val)
 			return true;