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path: root/drivers/net/wireless/virt_wifi.c
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Diffstat (limited to 'drivers/net/wireless/virt_wifi.c')
-rw-r--r--drivers/net/wireless/virt_wifi.c58
1 files changed, 54 insertions, 4 deletions
diff --git a/drivers/net/wireless/virt_wifi.c b/drivers/net/wireless/virt_wifi.c
index be92e1220284..01305ba2d3aa 100644
--- a/drivers/net/wireless/virt_wifi.c
+++ b/drivers/net/wireless/virt_wifi.c
@@ -450,7 +450,6 @@ static void virt_wifi_net_device_destructor(struct net_device *dev)
*/
kfree(dev->ieee80211_ptr);
dev->ieee80211_ptr = NULL;
- free_netdev(dev);
}
/* No lock interaction. */
@@ -458,7 +457,7 @@ static void virt_wifi_setup(struct net_device *dev)
{
ether_setup(dev);
dev->netdev_ops = &virt_wifi_ops;
- dev->priv_destructor = virt_wifi_net_device_destructor;
+ dev->needs_free_netdev = true;
}
/* Called in a RCU read critical section from netif_receive_skb */
@@ -544,10 +543,12 @@ static int virt_wifi_newlink(struct net *src_net, struct net_device *dev,
goto unregister_netdev;
}
+ dev->priv_destructor = virt_wifi_net_device_destructor;
priv->being_deleted = false;
priv->is_connected = false;
priv->is_up = false;
INIT_DELAYED_WORK(&priv->connect, virt_wifi_connect_complete);
+ __module_get(THIS_MODULE);
return 0;
unregister_netdev:
@@ -578,6 +579,7 @@ static void virt_wifi_dellink(struct net_device *dev,
netdev_upper_dev_unlink(priv->lowerdev, dev);
unregister_netdevice_queue(dev, head);
+ module_put(THIS_MODULE);
/* Deleting the wiphy is handled in the module destructor. */
}
@@ -590,6 +592,42 @@ static struct rtnl_link_ops virt_wifi_link_ops = {
.priv_size = sizeof(struct virt_wifi_netdev_priv),
};
+static bool netif_is_virt_wifi_dev(const struct net_device *dev)
+{
+ return rcu_access_pointer(dev->rx_handler) == virt_wifi_rx_handler;
+}
+
+static int virt_wifi_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct net_device *lower_dev = netdev_notifier_info_to_dev(ptr);
+ struct virt_wifi_netdev_priv *priv;
+ struct net_device *upper_dev;
+ LIST_HEAD(list_kill);
+
+ if (!netif_is_virt_wifi_dev(lower_dev))
+ return NOTIFY_DONE;
+
+ switch (event) {
+ case NETDEV_UNREGISTER:
+ priv = rtnl_dereference(lower_dev->rx_handler_data);
+ if (!priv)
+ return NOTIFY_DONE;
+
+ upper_dev = priv->upperdev;
+
+ upper_dev->rtnl_link_ops->dellink(upper_dev, &list_kill);
+ unregister_netdevice_many(&list_kill);
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block virt_wifi_notifier = {
+ .notifier_call = virt_wifi_event,
+};
+
/* Acquires and releases the rtnl lock. */
static int __init virt_wifi_init_module(void)
{
@@ -598,14 +636,25 @@ static int __init virt_wifi_init_module(void)
/* Guaranteed to be locallly-administered and not multicast. */
eth_random_addr(fake_router_bssid);
+ err = register_netdevice_notifier(&virt_wifi_notifier);
+ if (err)
+ return err;
+
+ err = -ENOMEM;
common_wiphy = virt_wifi_make_wiphy();
if (!common_wiphy)
- return -ENOMEM;
+ goto notifier;
err = rtnl_link_register(&virt_wifi_link_ops);
if (err)
- virt_wifi_destroy_wiphy(common_wiphy);
+ goto destroy_wiphy;
+ return 0;
+
+destroy_wiphy:
+ virt_wifi_destroy_wiphy(common_wiphy);
+notifier:
+ unregister_netdevice_notifier(&virt_wifi_notifier);
return err;
}
@@ -615,6 +664,7 @@ static void __exit virt_wifi_cleanup_module(void)
/* Will delete any devices that depend on the wiphy. */
rtnl_link_unregister(&virt_wifi_link_ops);
virt_wifi_destroy_wiphy(common_wiphy);
+ unregister_netdevice_notifier(&virt_wifi_notifier);
}
module_init(virt_wifi_init_module);