}
EXPORT_SYMBOL(rtnl_lock);
+int rtnl_lock_killable(void)
+{
+ return mutex_lock_killable(&rtnl_mutex);
+}
+EXPORT_SYMBOL(rtnl_lock_killable);
+
static struct sk_buff *defer_kfree_skb_list;
void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
{
* __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
* @ops: struct rtnl_link_ops * to unregister
*
- * The caller must hold the rtnl_mutex.
+ * The caller must hold the rtnl_mutex and guarantee net_namespace_list
+ * integrity (hold pernet_ops_rwsem for writing to close the race
+ * with setup_net() and cleanup_net()).
*/
void __rtnl_link_unregister(struct rtnl_link_ops *ops)
{
for (;;) {
unregistering = false;
rtnl_lock();
+ /* We held write locked pernet_ops_rwsem, and parallel
+ * setup_net() and cleanup_net() are not possible.
+ */
for_each_net(net) {
if (net->dev_unreg_count > 0) {
unregistering = true;
*/
void rtnl_link_unregister(struct rtnl_link_ops *ops)
{
- /* Close the race with cleanup_net() */
- mutex_lock(&net_mutex);
+ /* Close the race with setup_net() and cleanup_net() */
+ down_write(&pernet_ops_rwsem);
rtnl_lock_unregistering_all();
__rtnl_link_unregister(ops);
rtnl_unlock();
- mutex_unlock(&net_mutex);
+ up_write(&pernet_ops_rwsem);
}
EXPORT_SYMBOL_GPL(rtnl_link_unregister);