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authorAllan Stephens <allan.stephens@windriver.com>2012-04-18 00:22:49 +0200
committerPaul Gortmaker <paul.gortmaker@windriver.com>2012-04-19 21:46:42 +0200
commitf21536d1e73c36b37c50f71013c67f19db77d4b8 (patch)
treeaefaeb429a611ae8a5489956e4004cdf09379416 /net/tipc
parenttipc: Optimize re-initialization of port message header templates (diff)
downloadlinux-f21536d1e73c36b37c50f71013c67f19db77d4b8.tar.xz
linux-f21536d1e73c36b37c50f71013c67f19db77d4b8.zip
tipc: Ensure network address change doesn't impact new port
Re-orders port creation logic so that the initialization of a new port's message header template occurs while the port list lock is held. This ensures that a change to the node's network address that occurs at the same time as the port is being created does not result in the template identifying the sender using the former network address. The new approach guarantees that the new port's template is using the current network address or that it will be updated when the address changes. Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/port.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/net/tipc/port.c b/net/tipc/port.c
index 6156c6740f67..3b7162c1f074 100644
--- a/net/tipc/port.c
+++ b/net/tipc/port.c
@@ -221,18 +221,25 @@ struct tipc_port *tipc_createport_raw(void *usr_handle,
p_ptr->usr_handle = usr_handle;
p_ptr->max_pkt = MAX_PKT_DEFAULT;
p_ptr->ref = ref;
- msg = &p_ptr->phdr;
- tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
- msg_set_origport(msg, ref);
INIT_LIST_HEAD(&p_ptr->wait_list);
INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
p_ptr->dispatcher = dispatcher;
p_ptr->wakeup = wakeup;
p_ptr->user_port = NULL;
k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
- spin_lock_bh(&tipc_port_list_lock);
INIT_LIST_HEAD(&p_ptr->publications);
INIT_LIST_HEAD(&p_ptr->port_list);
+
+ /*
+ * Must hold port list lock while initializing message header template
+ * to ensure a change to node's own network address doesn't result
+ * in template containing out-dated network address information
+ */
+
+ spin_lock_bh(&tipc_port_list_lock);
+ msg = &p_ptr->phdr;
+ tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
+ msg_set_origport(msg, ref);
list_add_tail(&p_ptr->port_list, &ports);
spin_unlock_bh(&tipc_port_list_lock);
return p_ptr;