On Tue, Aug 04, 2020 at 04:14:14PM -0700, David Miller wrote:

From: izabela.bakollari@gmail.com
Date: Tue,  4 Aug 2020 18:09:08 +0200

quoted

@@ -1315,6 +1334,53 @@ static int net_dm_cmd_trace(struct sk_buff *skb,
 	return -EOPNOTSUPP;
 }
 
+static int net_dm_interface_start(struct net *net, const char *ifname)
+{
+	struct net_device *nd = dev_get_by_name(net, ifname);
+
+	if (nd)
+		interface = nd;
+	else
+		return -ENODEV;
+
+	return 0;
+}
+
+static int net_dm_interface_stop(struct net *net, const char *ifname)
+{
+	dev_put(interface);
+	interface = NULL;
+
+	return 0;
+}

Where is the netdev notifier that will drop this reference if the network
device is unregistered?

See the changes to dropmon_net_event in the patch.  Its there under the case for
NETDEV_UNREGISTER

Neil
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