bonding: fix alb mode locking regression

[ Upstream commit 815bcc2719c12b6f5b511706e2d19728e07f0b02 ]

Fix locking issue in alb MAC address management; removed
incorrect locking and replaced with correct locking.  This bug was
introduced in commit 059fe7a578fba5bbb0fdc0365bfcf6218fa25eb0
("bonding: Convert locks to _bh, rework alb locking for new locking")

	Bug reported by Paul Smith <paul@mad-scientist.net>, who also
tested the fix.

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 4489e586be1d9c10dd5fc1c6f3d1119cfcd1b26b..e929e612503fcdf38eb8d0309c306a3154422936 100644 (file)
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -1716,9 +1716,6 @@ int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
                }
        }
 
-       write_unlock_bh(&bond->curr_slave_lock);
-       read_unlock(&bond->lock);
-
        if (swap_slave) {
                alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
                alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
@@ -1726,16 +1723,15 @@ int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
                alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
                                       bond->alb_info.rlb_enabled);
 
+               read_lock(&bond->lock);
                alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
                if (bond->alb_info.rlb_enabled) {
                        /* inform clients mac address has changed */
                        rlb_req_update_slave_clients(bond, bond->curr_active_slave);
                }
+               read_unlock(&bond->lock);
        }
 
-       read_lock(&bond->lock);
-       write_lock_bh(&bond->curr_slave_lock);
-
        return 0;
 }