bonding: Convert locks to _bh, rework alb locking for new locking

[kernel/kernel-generic.git] / drivers / net / bonding / bond_main.c

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index a357727..15c1f7a 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1590,15 +1590,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
        case BOND_MODE_TLB:
        case BOND_MODE_ALB:
                new_slave->state = BOND_STATE_ACTIVE;
-               if ((!bond->curr_active_slave) &&
-                   (new_slave->link != BOND_LINK_DOWN)) {
-                       /* first slave or no active slave yet, and this link
-                        * is OK, so make this interface the active one
-                        */
-                       bond_change_active_slave(bond, new_slave);
-               } else {
-                       bond_set_slave_inactive_flags(new_slave);
-               }
+               bond_set_slave_inactive_flags(new_slave);
                break;
        default:
                dprintk("This slave is always active in trunk mode\n");
@@ -1754,9 +1746,23 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
                bond_alb_deinit_slave(bond, slave);
        }
 
-       if (oldcurrent == slave)
+       if (oldcurrent == slave) {
+               /*
+                * Note that we hold RTNL over this sequence, so there
+                * is no concern that another slave add/remove event
+                * will interfere.
+                */
+               write_unlock_bh(&bond->lock);
+               read_lock(&bond->lock);
+               write_lock_bh(&bond->curr_slave_lock);
+
                bond_select_active_slave(bond);
 
+               write_unlock_bh(&bond->curr_slave_lock);
+               read_unlock(&bond->lock);
+               write_lock_bh(&bond->lock);
+       }
+
        if (bond->slave_cnt == 0) {
                bond_set_carrier(bond);
 
@@ -2012,16 +2018,19 @@ static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_devi
                return -EINVAL;
        }
 
-       write_lock_bh(&bond->lock);
+       read_lock(&bond->lock);
 
+       read_lock(&bond->curr_slave_lock);
        old_active = bond->curr_active_slave;
+       read_unlock(&bond->curr_slave_lock);
+
        new_active = bond_get_slave_by_dev(bond, slave_dev);
 
        /*
         * Changing to the current active: do nothing; return success.
         */
        if (new_active && (new_active == old_active)) {
-               write_unlock_bh(&bond->lock);
+               read_unlock(&bond->lock);
                return 0;
        }
 
@@ -2029,12 +2038,14 @@ static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_devi
            (old_active) &&
            (new_active->link == BOND_LINK_UP) &&
            IS_UP(new_active->dev)) {
+               write_lock_bh(&bond->curr_slave_lock);
                bond_change_active_slave(bond, new_active);
+               write_unlock_bh(&bond->curr_slave_lock);
        } else {
                res = -EINVAL;
        }
 
-       write_unlock_bh(&bond->lock);
+       read_unlock(&bond->lock);
 
        return res;
 }
@@ -2140,7 +2151,11 @@ static int __bond_mii_monitor(struct bonding *bond, int have_locks)
                switch (slave->link) {
                case BOND_LINK_UP:      /* the link was up */
                        if (link_state == BMSR_LSTATUS) {
-                               /* link stays up, nothing more to do */
+                               if (!oldcurrent) {
+                                       if (!have_locks)
+                                               return 1;
+                                       do_failover = 1;
+                               }
                                break;
                        } else { /* link going down */
                                slave->link  = BOND_LINK_FAIL;
@@ -2327,11 +2342,14 @@ static int __bond_mii_monitor(struct bonding *bond, int have_locks)
        } /* end of for */
 
        if (do_failover) {
-               write_lock(&bond->curr_slave_lock);
+               ASSERT_RTNL();
+
+               write_lock_bh(&bond->curr_slave_lock);
 
                bond_select_active_slave(bond);
 
-               write_unlock(&bond->curr_slave_lock);
+               write_unlock_bh(&bond->curr_slave_lock);
+
        } else
                bond_set_carrier(bond);
 
@@ -2770,11 +2788,14 @@ void bond_loadbalance_arp_mon(struct work_struct *work)
        }
 
        if (do_failover) {
-               write_lock(&bond->curr_slave_lock);
+               rtnl_lock();
+               write_lock_bh(&bond->curr_slave_lock);
 
                bond_select_active_slave(bond);
 
-               write_unlock(&bond->curr_slave_lock);
+               write_unlock_bh(&bond->curr_slave_lock);
+               rtnl_unlock();
+
        }
 
 re_arm:
@@ -2831,7 +2852,9 @@ void bond_activebackup_arp_mon(struct work_struct *work)
 
                                slave->link = BOND_LINK_UP;
 
-                               write_lock(&bond->curr_slave_lock);
+                               rtnl_lock();
+
+                               write_lock_bh(&bond->curr_slave_lock);
 
                                if ((!bond->curr_active_slave) &&
                                    ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
@@ -2865,7 +2888,8 @@ void bond_activebackup_arp_mon(struct work_struct *work)
                                               slave->dev->name);
                                }
 
-                               write_unlock(&bond->curr_slave_lock);
+                               write_unlock_bh(&bond->curr_slave_lock);
+                               rtnl_unlock();
                        }
                } else {
                        read_lock(&bond->curr_slave_lock);
@@ -2935,12 +2959,15 @@ void bond_activebackup_arp_mon(struct work_struct *work)
                               bond->dev->name,
                               slave->dev->name);
 
-                       write_lock(&bond->curr_slave_lock);
+                       rtnl_lock();
+                       write_lock_bh(&bond->curr_slave_lock);
 
                        bond_select_active_slave(bond);
                        slave = bond->curr_active_slave;
 
-                       write_unlock(&bond->curr_slave_lock);
+                       write_unlock_bh(&bond->curr_slave_lock);
+
+                       rtnl_unlock();
 
                        bond->current_arp_slave = slave;
 
@@ -2959,9 +2986,12 @@ void bond_activebackup_arp_mon(struct work_struct *work)
                               bond->primary_slave->dev->name);
 
                        /* primary is up so switch to it */
-                       write_lock(&bond->curr_slave_lock);
+                       rtnl_lock();
+                       write_lock_bh(&bond->curr_slave_lock);
                        bond_change_active_slave(bond, bond->primary_slave);
-                       write_unlock(&bond->curr_slave_lock);
+                       write_unlock_bh(&bond->curr_slave_lock);
+
+                       rtnl_unlock();
 
                        slave = bond->primary_slave;
                        slave->jiffies = jiffies;