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Bluetooth: 6LoWPAN: Remove network devices when unloading 

When the module is unloaded, unregister the network device
so that the system does not try to access non-existing device.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Jukka Rissanen 2014-06-18 16:37:11 +03:00 committed by Marcel Holtmann
parent 18d93c1766
commit 7f11825382
1 changed files with 54 additions and 0 deletions
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54
net/bluetooth/6lowpan.c
View File

@ -607,6 +607,17 @@ static void ifup(struct net_device *netdev)
rtnl_unlock();
}
static void ifdown(struct net_device *netdev)
{
int err;
rtnl_lock();
err = dev_close(netdev);
if (err < 0)
BT_INFO("iface %s cannot be closed (%d)", netdev->name, err);
rtnl_unlock();
}
static void do_notify_peers(struct work_struct *work)
{
struct lowpan_dev *dev = container_of(work, struct lowpan_dev,
@ -829,6 +840,8 @@ static void chan_close_cb(struct l2cap_chan *chan)
cancel_delayed_work_sync(&dev->notify_peers);
ifdown(dev->netdev);
if (!removed) {
INIT_WORK(&entry->delete_netdev, delete_netdev);
schedule_work(&entry->delete_netdev);
@ -1186,6 +1199,43 @@ static const struct file_operations lowpan_control_fops = {
.release = single_release,
};
static void disconnect_devices(void)
{
struct lowpan_dev *entry, *tmp, *new_dev;
struct list_head devices;
unsigned long flags;
INIT_LIST_HEAD(&devices);
/* We make a separate list of devices because the unregister_netdev()
* will call device_event() which will also want to modify the same
* devices list.
*/
read_lock_irqsave(&devices_lock, flags);
list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices, list) {
new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
if (!new_dev)
break;
new_dev->netdev = entry->netdev;
INIT_LIST_HEAD(&new_dev->list);
list_add(&new_dev->list, &devices);
}
read_unlock_irqrestore(&devices_lock, flags);
list_for_each_entry_safe(entry, tmp, &devices, list) {
ifdown(entry->netdev);
BT_DBG("Unregistering netdev %s %p",
entry->netdev->name, entry->netdev);
unregister_netdev(entry->netdev);
kfree(entry);
}
}
static int device_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
@ -1202,6 +1252,8 @@ static int device_event(struct notifier_block *unused,
list_for_each_entry_safe(entry, tmp, &bt_6lowpan_devices,
list) {
if (entry->netdev == netdev) {
BT_DBG("Unregistered netdev %s %p",
netdev->name, netdev);
list_del(&entry->list);
kfree(entry);
break;
@ -1240,6 +1292,8 @@ static void __exit bt_6lowpan_exit(void)
l2cap_chan_put(listen_chan);
}
disconnect_devices();
unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
}