netdev - [PATCH] net: Statically initialize init_net.dev_base

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Date:	Wed, 18 Jul 2012 12:06:07 -0700
From:	Mark Rustad <mark.d.rustad@...el.com>
To:	netdev@...r.kernel.org, davem@...emloft.net,
	gaofeng@...fujitsu.com, nhorman@...driver.com,
	eric.dumazet@...il.com
Subject: [PATCH] net: Statically initialize init_net.dev_base_head

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@...el.com>
---

 net/core/dev.c           |    3 ++-
 net/core/net_namespace.c |    4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 0f28a9e..1cb0d8a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6283,7 +6283,8 @@ 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 dddbacb..42f1e1c 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -27,7 +27,9 @@ 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 */

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