net: Statically initialize init_net.dev_base_head

commit 734b65417b24d6eea3e3d7457e1f11493890ee1d upstream.

This change eliminates an initialization-order hazard most
recently seen when netprio_cgroup is built into the kernel.

With thanks to Eric Dumazet for catching a bug.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/core/dev.c b/net/core/dev.c
index 832ba6d346a57a6965317eed27646a3a2e37facc..871593834850f41a526d7d791d9e8b8da80e9890 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6387,7 +6387,8 @@ static struct hlist_head *netdev_create_hash(void)
 /* Initialize per network namespace state */
 static int __net_init netdev_init(struct net *net)
 {
-       INIT_LIST_HEAD(&net->dev_base_head);
+       if (net != &init_net)
+               INIT_LIST_HEAD(&net->dev_base_head);
 
        net->dev_name_head = netdev_create_hash();
        if (net->dev_name_head == NULL)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 31a5ae51a45c8770136ac1b60b76da842d9803df..dd00b71dd092810761025103ee9d0ce2e027fce1 100644 (file)
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -25,7 +25,9 @@ static DEFINE_MUTEX(net_mutex);
 LIST_HEAD(net_namespace_list);
 EXPORT_SYMBOL_GPL(net_namespace_list);
 
-struct net init_net;
+struct net init_net = {
+       .dev_base_head = LIST_HEAD_INIT(init_net.dev_base_head),
+};
 EXPORT_SYMBOL(init_net);
 
 #define INITIAL_NET_GEN_PTRS   13 /* +1 for len +2 for rcu_head */