bonding: Fix initialize after use for 3ad machine state spinlock

The 3ad machine state spinlock can be used before it is inititialized
while doing bond_enslave() (and the port is being initialized) since
port->slave is set before the lock is prepared, thus causing soft
lock-ups and a multitude of other nasty bugs.

[ Rename __initialize_port_locks() variable name to 'slave' -DaveM ]

Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 0e45b400b6fc..fc58d118d844 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -389,13 +389,13 @@ static u8 __get_duplex(struct port *port)
 
 /**
  * __initialize_port_locks - initialize a port's STATE machine spinlock
- * @port: the port we're looking at
+ * @port: the slave of the port we're looking at
  *
  */
-static inline void __initialize_port_locks(struct port *port)
+static inline void __initialize_port_locks(struct slave *slave)
 {
         // make sure it isn't called twice
-        spin_lock_init(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
+        spin_lock_init(&(SLAVE_AD_INFO(slave).state_machine_lock));
 }
 
 //conversions
@@ -1910,6 +1910,7 @@ int bond_3ad_bind_slave(struct slave *slave)
 
                 ad_initialize_port(port, bond->params.lacp_fast);
 
+                __initialize_port_locks(slave);
                 port->slave = slave;
                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
@@ -1932,8 +1933,6 @@ int bond_3ad_bind_slave(struct slave *slave)
                 port->next_port_in_aggregator = NULL;
 
                 __disable_port(port);
-                __initialize_port_locks(port);
-
 
                 // aggregator initialization
                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);