2 files changed, 31 insertions, 1 deletions

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index cb6f5482d203..7397c693f984 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -1061,6 +1061,7 @@ struct net_device_context {
 	struct net_device __rcu *vf_netdev;
 	struct netvsc_vf_pcpu_stats __percpu *vf_stats;
 	struct delayed_work vf_takeover;
+	struct delayed_work vfns_work;
 
 	/* 1: allocated, serial number is valid. 0: not allocated */
 	u32 vf_alloc;
@@ -1075,6 +1076,8 @@ struct net_device_context {
 	struct netvsc_device_info *saved_netvsc_dev_info;
 };
 
+void netvsc_vfns_work(struct work_struct *w);
+
 /* Azure hosts don't support non-TCP port numbers in hashing for fragmented
  * packets. We can use ethtool to change UDP hash level when necessary.
  */
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index f44753756358..39c892e46cb0 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2522,6 +2522,7 @@ static int netvsc_probe(struct hv_device *dev,
 	spin_lock_init(&net_device_ctx->lock);
 	INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
 	INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);
+	INIT_DELAYED_WORK(&net_device_ctx->vfns_work, netvsc_vfns_work);
 
 	net_device_ctx->vf_stats
 		= netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats);
@@ -2666,6 +2667,8 @@ static void netvsc_remove(struct hv_device *dev)
 	cancel_delayed_work_sync(&ndev_ctx->dwork);
 
 	rtnl_lock();
+	cancel_delayed_work_sync(&ndev_ctx->vfns_work);
+
 	nvdev = rtnl_dereference(ndev_ctx->nvdev);
 	if (nvdev) {
 		cancel_work_sync(&nvdev->subchan_work);
@@ -2707,6 +2710,7 @@ static int netvsc_suspend(struct hv_device *dev)
 	cancel_delayed_work_sync(&ndev_ctx->dwork);
 
 	rtnl_lock();
+	cancel_delayed_work_sync(&ndev_ctx->vfns_work);
 
 	nvdev = rtnl_dereference(ndev_ctx->nvdev);
 	if (nvdev == NULL) {
@@ -2800,6 +2804,27 @@ static void netvsc_event_set_vf_ns(struct net_device *ndev)
 	}
 }
 
+void netvsc_vfns_work(struct work_struct *w)
+{
+	struct net_device_context *ndev_ctx =
+		container_of(w, struct net_device_context, vfns_work.work);
+	struct net_device *ndev;
+
+	if (!rtnl_trylock()) {
+		schedule_delayed_work(&ndev_ctx->vfns_work, 1);
+		return;
+	}
+
+	ndev = hv_get_drvdata(ndev_ctx->device_ctx);
+	if (!ndev)
+		goto out;
+
+	netvsc_event_set_vf_ns(ndev);
+
+out:
+	rtnl_unlock();
+}
+
 /*
  * On Hyper-V, every VF interface is matched with a corresponding
  * synthetic interface. The synthetic interface is presented first
@@ -2810,10 +2835,12 @@ static int netvsc_netdev_event(struct notifier_block *this,
 			       unsigned long event, void *ptr)
 {
 	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
+	struct net_device_context *ndev_ctx;
 	int ret = 0;
 
 	if (event_dev->netdev_ops == &device_ops && event == NETDEV_REGISTER) {
-		netvsc_event_set_vf_ns(event_dev);
+		ndev_ctx = netdev_priv(event_dev);
+		schedule_delayed_work(&ndev_ctx->vfns_work, 0);
 		return NOTIFY_DONE;
 	}