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-rw-r--r--net/core/net_namespace.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 2178db8e47cd..6a2f41288249 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -501,6 +501,23 @@ static void cleanup_net(struct work_struct *work)
net_drop_ns(net);
}
}
+
+/**
+ * net_ns_barrier - wait until concurrent net_cleanup_work is done
+ *
+ * cleanup_net runs from work queue and will first remove namespaces
+ * from the global list, then run net exit functions.
+ *
+ * Call this in module exit path to make sure that all netns
+ * ->exit ops have been invoked before the function is removed.
+ */
+void net_ns_barrier(void)
+{
+ mutex_lock(&net_mutex);
+ mutex_unlock(&net_mutex);
+}
+EXPORT_SYMBOL(net_ns_barrier);
+
static DECLARE_WORK(net_cleanup_work, cleanup_net);
void __put_net(struct net *net)
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