bonding: fix enslaving in alb mode when link down

[ Upstream commit b924551bed09f61b64f21bffe241afc5526b091a ]

bond_alb_init_slave() is called from bond_enslave() and sets the slave's MAC
address. This is done differently for TLB and ALB modes.
bond->alb_info.rlb_enabled is used to discriminate between the two modes but
this flag may be uninitialized if the slave is being enslaved prior to calling
bond_open() -> bond_alb_initialize() on the master.

It turns out all the callers of alb_set_slave_mac_addr() pass
bond->alb_info.rlb_enabled as the hw parameter.

This patch cleans up the unnecessary parameter of alb_set_slave_mac_addr() and
makes the function decide based on the bonding mode instead, which fixes the
above problem.

Reported-by: Narendra K <Narendra_K@Dell.com>
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
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@linuxfoundation.org>

1 files changed, 9 insertions, 18 deletions

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 2df9276720a..5e725e07d61 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -871,16 +871,12 @@ static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
         }
 }
 
-/* hw is a boolean parameter that determines whether we should try and
- * set the hw address of the device as well as the hw address of the
- * net_device
- */
-static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw)
+static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[])
 {
         struct net_device *dev = slave->dev;
         struct sockaddr s_addr;
 
-        if (!hw) {
+        if (slave->bond->params.mode == BOND_MODE_TLB) {
                 memcpy(dev->dev_addr, addr, dev->addr_len);
                 return 0;
         }
@@ -910,8 +906,8 @@ static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct
         u8 tmp_mac_addr[ETH_ALEN];
 
         memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
-        alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled);
-        alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled);
+        alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr);
+        alb_set_slave_mac_addr(slave2, tmp_mac_addr);
 
 }
 
@@ -1058,8 +1054,7 @@ static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slav
 
                 /* Try setting slave mac to bond address and fall-through
                    to code handling that situation below... */
-                alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
-                                       bond->alb_info.rlb_enabled);
+                alb_set_slave_mac_addr(slave, bond->dev->dev_addr);
         }
 
         /* The slave's address is equal to the address of the bond.
@@ -1095,8 +1090,7 @@ static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slav
         }
 
         if (free_mac_slave) {
-                alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
-                                       bond->alb_info.rlb_enabled);
+                alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr);
 
                 pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
                            bond->dev->name, slave->dev->name,
@@ -1452,8 +1446,7 @@ int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
 {
         int res;
 
-        res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
-                                     bond->alb_info.rlb_enabled);
+        res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr);
         if (res) {
                 return res;
         }
@@ -1604,8 +1597,7 @@ void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave
                 alb_swap_mac_addr(bond, swap_slave, new_slave);
         } else {
                 /* set the new_slave to the bond mac address */
-                alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
-                                       bond->alb_info.rlb_enabled);
+                alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr);
         }
 
         if (swap_slave) {
@@ -1665,8 +1657,7 @@ int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
                 alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
                 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
         } else {
-                alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr,
-                                       bond->alb_info.rlb_enabled);
+                alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr);
 
                 read_lock(&bond->lock);
                 alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);