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Commit e93737b0 authored by Krishna Kumar's avatar Krishna Kumar Committed by David S. Miller

net: Handle NETREG_UNINITIALIZED devices correctly

Fix two problems:

1. If unregister_netdevice_many() is called with both registered
   and unregistered devices, rollback_registered_many() bails out
   when it reaches the first unregistered device. The processing
   of the prior registered devices is unfinished, and the
   remaining devices are skipped, and possible registered netdev's
   are leaked/unregistered.

2. System hangs or panics depending on how the devices are passed,
   since when netdev_run_todo() runs, some devices were not fully

Tested by passing intermingled unregistered and registered vlan
devices to unregister_netdevice_many() as follows:
	1. dev, fake_dev1, fake_dev2: hangs in run_todo
	   ("unregister_netdevice: waiting for eth1.100 to become
	    free. Usage count = 1")
	2. fake_dev1, dev, fake_dev2: failure during de-registration
	   and next registration, followed by a vlan driver Oops
	   during subsequent registration.

Confirmed that the patch fixes both cases.
Signed-off-by: default avatarKrishna Kumar <>
Acked-by: default avatarEric Dumazet <>
Signed-off-by: default avatarDavid S. Miller <>
parent bbb84619
......@@ -4771,21 +4771,23 @@ static void net_set_todo(struct net_device *dev)
static void rollback_registered_many(struct list_head *head)
struct net_device *dev;
struct net_device *dev, *tmp;
list_for_each_entry(dev, head, unreg_list) {
list_for_each_entry_safe(dev, tmp, head, unreg_list) {
/* Some devices call without registering
* for initialization unwind.
* for initialization unwind. Remove those
* devices and proceed with the remaining.
if (dev->reg_state == NETREG_UNINITIALIZED) {
pr_debug("unregister_netdevice: device %s/%p never "
"was registered\n", dev->name, dev);
BUG_ON(dev->reg_state != NETREG_REGISTERED);
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