Lower list should be empty just like upper.

Signed-off-by: David Ahern <d...@cumulusnetworks.com>
---
 net/core/dev.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index a9fe14908b44..c6bbf310d407 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5219,6 +5219,20 @@ struct net_device *netdev_master_upper_dev_get(struct 
net_device *dev)
 }
 EXPORT_SYMBOL(netdev_master_upper_dev_get);
 
+/**
+ * netdev_has_any_lower_dev - Check if device is linked to some device
+ * @dev: device
+ *
+ * Find out if a device is linked to a lower device and return true in case
+ * it is. The caller must hold the RTNL lock.
+ */
+static bool netdev_has_any_lower_dev(struct net_device *dev)
+{
+       ASSERT_RTNL();
+
+       return !list_empty(&dev->adj_list.lower);
+}
+
 void *netdev_adjacent_get_private(struct list_head *adj_list)
 {
        struct netdev_adjacent *adj;
@@ -6616,6 +6630,7 @@ static void rollback_registered_many(struct list_head 
*head)
 
                /* Notifier chain MUST detach us all upper devices. */
                WARN_ON(netdev_has_any_upper_dev(dev));
+               WARN_ON(netdev_has_any_lower_dev(dev));
 
                /* Remove entries from kobject tree */
                netdev_unregister_kobject(dev);
-- 
2.1.4

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