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net: Add warning if any lower device is still in adjacency list

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Lower list should be empty just like upper.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2016-10-17 19:15:52 -07:00 committed by David S. Miller
parent f1170fd462
commit 0f524a80ff
1 changed files with 15 additions and 0 deletions
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15
net/core/dev.c
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@ -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);