net: add a list_head parameter to dellink() method

Adding a list_head parameter to rtnl_link_ops->dellink() methods
allow us to queue devices on a list, in order to dismantle
them all at once.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 19 insertions, 18 deletions

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 3aabfd9dd21..20b7707f38e 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -555,13 +555,13 @@ static int macvlan_newlink(struct net_device *dev,
         return 0;
 }
 
-static void macvlan_dellink(struct net_device *dev)
+static void macvlan_dellink(struct net_device *dev, struct list_head *head)
 {
         struct macvlan_dev *vlan = netdev_priv(dev);
         struct macvlan_port *port = vlan->port;
 
         list_del(&vlan->list);
-        unregister_netdevice(dev);
+        unregister_netdevice_queue(dev, head);
 
         if (list_empty(&port->vlans))
                 macvlan_port_destroy(port->dev);
@@ -601,7 +601,7 @@ static int macvlan_device_event(struct notifier_block *unused,
                 break;
         case NETDEV_UNREGISTER:
                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
-                        macvlan_dellink(vlan->dev);
+                        macvlan_dellink(vlan->dev, NULL);
                 break;
         }
         return NOTIFY_DONE;
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index ade5b344f75..ffb502daa91 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -442,7 +442,7 @@ err_register_peer:
         return err;
 }
 
-static void veth_dellink(struct net_device *dev)
+static void veth_dellink(struct net_device *dev, struct list_head *head)
 {
         struct veth_priv *priv;
         struct net_device *peer;
diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index c3aa044d3fc..cd5af1f508f 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -61,7 +61,8 @@ struct rtnl_link_ops {
         int                     (*changelink)(struct net_device *dev,
                                               struct nlattr *tb[],
                                               struct nlattr *data[]);
-        void                    (*dellink)(struct net_device *dev);
+        void                    (*dellink)(struct net_device *dev,
+                                           struct list_head *head);
 
         size_t                  (*get_size)(const struct net_device *dev);
         int                     (*fill_info)(struct sk_buff *skb,
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 8836575f9d7..6b5c9dddaa7 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -140,7 +140,7 @@ static void vlan_rcu_free(struct rcu_head *rcu)
         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 }
 
-void unregister_vlan_dev(struct net_device *dev)
+void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
 {
         struct vlan_dev_info *vlan = vlan_dev_info(dev);
         struct net_device *real_dev = vlan->real_dev;
@@ -164,7 +164,7 @@ void unregister_vlan_dev(struct net_device *dev)
 
         synchronize_net();
 
-        unregister_netdevice(dev);
+        unregister_netdevice_queue(dev, head);
 
         /* If the group is now empty, kill off the group. */
         if (grp->nr_vlans == 0) {
@@ -535,7 +535,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
                         if (grp->nr_vlans == 1)
                                 i = VLAN_GROUP_ARRAY_LEN;
 
-                        unregister_vlan_dev(vlandev);
+                        unregister_vlan_dev(vlandev, NULL);
                 }
                 break;
         }
@@ -642,7 +642,7 @@ static int vlan_ioctl_handler(struct net *net, void __user *arg)
                 err = -EPERM;
                 if (!capable(CAP_NET_ADMIN))
                         break;
-                unregister_vlan_dev(dev);
+                unregister_vlan_dev(dev, NULL);
                 err = 0;
                 break;
 
diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index 4ade5edf103..68f9290e683 100644
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -82,7 +82,7 @@ void vlan_dev_get_realdev_name(const struct net_device *dev, char *result);
 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id);
 void vlan_setup(struct net_device *dev);
 int register_vlan_dev(struct net_device *dev);
-void unregister_vlan_dev(struct net_device *dev);
+void unregister_vlan_dev(struct net_device *dev, struct list_head *head);
 
 static inline u32 vlan_get_ingress_priority(struct net_device *dev,
                                             u16 vlan_tci)
diff --git a/net/core/dev.c b/net/core/dev.c
index 04d3e301402..4513dfd5718 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5629,7 +5629,7 @@ restart:
 
                 /* Delete virtual devices */
                 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) {
-                        dev->rtnl_link_ops->dellink(dev);
+                        dev->rtnl_link_ops->dellink(dev, NULL);
                         goto restart;
                 }
 
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 52ea418d530..391a62cd9df 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -248,7 +248,7 @@ static LIST_HEAD(link_ops);
 int __rtnl_link_register(struct rtnl_link_ops *ops)
 {
         if (!ops->dellink)
-                ops->dellink = unregister_netdevice;
+                ops->dellink = unregister_netdevice_queue;
 
         list_add_tail(&ops->list, &link_ops);
         return 0;
@@ -277,13 +277,13 @@ EXPORT_SYMBOL_GPL(rtnl_link_register);
 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 {
         struct net_device *dev;
-restart:
+        LIST_HEAD(list_kill);
+
         for_each_netdev(net, dev) {
-                if (dev->rtnl_link_ops == ops) {
-                        ops->dellink(dev);
-                        goto restart;
-                }
+                if (dev->rtnl_link_ops == ops)
+                        ops->dellink(dev, &list_kill);
         }
+        unregister_netdevice_many(&list_kill);
 }
 
 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
@@ -972,7 +972,7 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
         if (!ops)
                 return -EOPNOTSUPP;
 
-        ops->dellink(dev);
+        ops->dellink(dev, NULL);
         return 0;
 }