net: sched: ignore tx_queue_len when assigning default qdisc

Since alloc_netdev_mqs() sets IFF_NO_QUEUE for drivers not initializing
tx_queue_len, it is safe to assume that if tx_queue_len is zero,
dev->priv flags always contains IFF_NO_QUEUE.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_generic.c

@@ -735,7 +735,7 @@ static void attach_one_default_qdisc(struct net_device *dev,
 {
 	struct Qdisc *qdisc = &noqueue_qdisc;
 
-	if (dev->tx_queue_len && !(dev->priv_flags & IFF_NO_QUEUE)) {
+	if (!(dev->priv_flags & IFF_NO_QUEUE)) {
 		qdisc = qdisc_create_dflt(dev_queue,
 					  default_qdisc_ops, TC_H_ROOT);
 		if (!qdisc) {
@@ -756,7 +756,6 @@ static void attach_default_qdiscs(struct net_device *dev)
 	txq = netdev_get_tx_queue(dev, 0);
 
 	if (!netif_is_multiqueue(dev) ||
-	    dev->tx_queue_len == 0 ||
 	    dev->priv_flags & IFF_NO_QUEUE) {
 		netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL);
 		dev->qdisc = txq->qdisc_sleeping;