diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c index 6826e4f61060..dcde56057fe1 100644 --- a/drivers/net/bonding/bond_3ad.c +++ b/drivers/net/bonding/bond_3ad.c @@ -2130,13 +2130,7 @@ re_arm: read_unlock(&bond->lock); if (should_notify_rtnl && rtnl_trylock()) { - bond_for_each_slave(bond, slave, iter) { - if (slave->should_notify) { - rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, - GFP_KERNEL); - slave->should_notify = 0; - } - } + bond_slave_state_notify(bond); rtnl_unlock(); } queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks); diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index e02029bbf5cc..82b70ff1fd28 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2623,17 +2623,17 @@ do_failover: /* * Send ARP probes for active-backup mode ARP monitor. + * + * Called with rcu_read_lock hold. */ static bool bond_ab_arp_probe(struct bonding *bond) { struct slave *slave, *before = NULL, *new_slave = NULL, - *curr_arp_slave, *curr_active_slave; + *curr_arp_slave = rcu_dereference(bond->current_arp_slave), + *curr_active_slave = rcu_dereference(bond->curr_active_slave); struct list_head *iter; bool found = false; - - rcu_read_lock(); - curr_arp_slave = rcu_dereference(bond->current_arp_slave); - curr_active_slave = rcu_dereference(bond->curr_active_slave); + bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; if (curr_arp_slave && curr_active_slave) pr_info("PROBE: c_arp %s && cas %s BAD\n", @@ -2642,32 +2642,23 @@ static bool bond_ab_arp_probe(struct bonding *bond) if (curr_active_slave) { bond_arp_send_all(bond, curr_active_slave); - rcu_read_unlock(); - return true; + return should_notify_rtnl; } - rcu_read_unlock(); /* if we don't have a curr_active_slave, search for the next available * backup slave from the current_arp_slave and make it the candidate * for becoming the curr_active_slave */ - if (!rtnl_trylock()) - return false; - /* curr_arp_slave might have gone away */ - curr_arp_slave = ACCESS_ONCE(bond->current_arp_slave); - if (!curr_arp_slave) { - curr_arp_slave = bond_first_slave(bond); - if (!curr_arp_slave) { - rtnl_unlock(); - return true; - } + curr_arp_slave = bond_first_slave_rcu(bond); + if (!curr_arp_slave) + return should_notify_rtnl; } - bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_NOW); + bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); - bond_for_each_slave(bond, slave, iter) { + bond_for_each_slave_rcu(bond, slave, iter) { if (!found && !before && IS_UP(slave->dev)) before = slave; @@ -2686,7 +2677,7 @@ static bool bond_ab_arp_probe(struct bonding *bond) slave->link_failure_count++; bond_set_slave_inactive_flags(slave, - BOND_SLAVE_NOTIFY_NOW); + BOND_SLAVE_NOTIFY_LATER); pr_info("%s: backup interface %s is now down.\n", bond->dev->name, slave->dev->name); @@ -2698,26 +2689,31 @@ static bool bond_ab_arp_probe(struct bonding *bond) if (!new_slave && before) new_slave = before; - if (!new_slave) { - rtnl_unlock(); - return true; - } + if (!new_slave) + goto check_state; new_slave->link = BOND_LINK_BACK; - bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); + bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); bond_arp_send_all(bond, new_slave); new_slave->jiffies = jiffies; rcu_assign_pointer(bond->current_arp_slave, new_slave); - rtnl_unlock(); - return true; +check_state: + bond_for_each_slave_rcu(bond, slave, iter) { + if (slave->should_notify) { + should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; + break; + } + } + return should_notify_rtnl; } static void bond_activebackup_arp_mon(struct work_struct *work) { struct bonding *bond = container_of(work, struct bonding, arp_work.work); - bool should_notify_peers = false, should_commit = false; + bool should_notify_peers = false; + bool should_notify_rtnl = false; int delta_in_ticks; delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); @@ -2726,11 +2722,12 @@ static void bond_activebackup_arp_mon(struct work_struct *work) goto re_arm; rcu_read_lock(); - should_notify_peers = bond_should_notify_peers(bond); - should_commit = bond_ab_arp_inspect(bond); - rcu_read_unlock(); - if (should_commit) { + should_notify_peers = bond_should_notify_peers(bond); + + if (bond_ab_arp_inspect(bond)) { + rcu_read_unlock(); + /* Race avoidance with bond_close flush of workqueue */ if (!rtnl_trylock()) { delta_in_ticks = 1; @@ -2739,23 +2736,28 @@ static void bond_activebackup_arp_mon(struct work_struct *work) } bond_ab_arp_commit(bond); + rtnl_unlock(); + rcu_read_lock(); } - if (!bond_ab_arp_probe(bond)) { - /* rtnl locking failed, re-arm */ - delta_in_ticks = 1; - should_notify_peers = false; - } + should_notify_rtnl = bond_ab_arp_probe(bond); + rcu_read_unlock(); re_arm: if (bond->params.arp_interval) queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); - if (should_notify_peers) { + if (should_notify_peers || should_notify_rtnl) { if (!rtnl_trylock()) return; - call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); + + if (should_notify_peers) + call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, + bond->dev); + if (should_notify_rtnl) + bond_slave_state_notify(bond); + rtnl_unlock(); } } diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h index 9b280ac8c454..2b0fdec695f7 100644 --- a/drivers/net/bonding/bonding.h +++ b/drivers/net/bonding/bonding.h @@ -335,6 +335,19 @@ static inline void bond_slave_state_change(struct bonding *bond) } } +static inline void bond_slave_state_notify(struct bonding *bond) +{ + struct list_head *iter; + struct slave *tmp; + + bond_for_each_slave(bond, tmp, iter) { + if (tmp->should_notify) { + rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_KERNEL); + tmp->should_notify = 0; + } + } +} + static inline int bond_slave_state(struct slave *slave) { return slave->backup;