+static int __macvtap_disable_queue(struct macvtap_queue *q)
+{
+ struct macvlan_dev *vlan;
+ struct macvtap_queue *nq;
+
+ vlan = rcu_dereference_protected(q->vlan,
+ lockdep_is_held(&macvtap_lock));
+
+ if (!q->enabled)
+ return -EINVAL;
+
+ if (vlan) {
+ int index = q->queue_index;
+ BUG_ON(index >= vlan->numvtaps);
+ nq = rcu_dereference_protected(vlan->taps[vlan->numvtaps - 1],
+ lockdep_is_held(&macvtap_lock));
+ nq->queue_index = index;
+
+ rcu_assign_pointer(vlan->taps[index], nq);
+ RCU_INIT_POINTER(vlan->taps[vlan->numvtaps - 1], NULL);
+ q->enabled = false;
+
+ vlan->numvtaps--;
+ }
+
+ return 0;
+}
+
+static int macvtap_disable_queue(struct macvtap_queue *q)
+{
+ int err;
+
+ spin_lock(&macvtap_lock);
+ err = __macvtap_disable_queue(q);
+ spin_unlock(&macvtap_lock);
+
+ return err;
+}
+