From 4087df87b868cef0dd19a9409b40fb9415503552 Mon Sep 17 00:00:00 2001 From: Veaceslav Falico Date: Wed, 25 Sep 2013 09:20:19 +0200 Subject: [PATCH] bonding: rework bond_ab_arp_probe() to use bond_for_each_slave() Currently it uses the hard-to-rcuify bond_for_each_slave_from(), and also it doesn't check every slave for disrepencies between the actual IS_UP(slave) and the slave->link == BOND_LINK_UP, but only till we find the next suitable slave. Fix this by using bond_for_each_slave() and storing the first good slave in *before till we find the current_arp_slave, after that we store the first good slave in new_slave. If new_slave is empty - use the slave stored in before, and if it's also empty - then we didn't find any suitable slave. Also, in the meanwhile, check for each slave status. CC: Jay Vosburgh CC: Andy Gospodarek Signed-off-by: Veaceslav Falico Signed-off-by: David S. Miller --- drivers/net/bonding/bond_main.c | 38 +++++++++++++++++++++------------ 1 file changed, 24 insertions(+), 14 deletions(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 6abbfaca0b93..3c96b1b10ba4 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2761,8 +2761,9 @@ do_failover: */ static void bond_ab_arp_probe(struct bonding *bond) { - struct slave *slave, *next_slave; - int i; + struct slave *slave, *before = NULL, *new_slave = NULL; + struct list_head *iter; + bool found = false; read_lock(&bond->curr_slave_lock); @@ -2792,18 +2793,12 @@ static void bond_ab_arp_probe(struct bonding *bond) bond_set_slave_inactive_flags(bond->current_arp_slave); - /* search for next candidate */ - next_slave = bond_next_slave(bond, bond->current_arp_slave); - bond_for_each_slave_from(bond, slave, i, next_slave) { - if (IS_UP(slave->dev)) { - slave->link = BOND_LINK_BACK; - bond_set_slave_active_flags(slave); - bond_arp_send_all(bond, slave); - slave->jiffies = jiffies; - bond->current_arp_slave = slave; - break; - } + bond_for_each_slave(bond, slave, iter) { + if (!found && !before && IS_UP(slave->dev)) + before = slave; + if (found && !new_slave && IS_UP(slave->dev)) + new_slave = slave; /* if the link state is up at this point, we * mark it down - this can happen if we have * simultaneous link failures and @@ -2811,7 +2806,7 @@ static void bond_ab_arp_probe(struct bonding *bond) * one the current slave so it is still marked * up when it is actually down */ - if (slave->link == BOND_LINK_UP) { + if (!IS_UP(slave->dev) && slave->link == BOND_LINK_UP) { slave->link = BOND_LINK_DOWN; if (slave->link_failure_count < UINT_MAX) slave->link_failure_count++; @@ -2821,7 +2816,22 @@ static void bond_ab_arp_probe(struct bonding *bond) pr_info("%s: backup interface %s is now down.\n", bond->dev->name, slave->dev->name); } + if (slave == bond->current_arp_slave) + found = true; } + + if (!new_slave && before) + new_slave = before; + + if (!new_slave) + return; + + new_slave->link = BOND_LINK_BACK; + bond_set_slave_active_flags(new_slave); + bond_arp_send_all(bond, new_slave); + new_slave->jiffies = jiffies; + bond->current_arp_slave = new_slave; + } void bond_activebackup_arp_mon(struct work_struct *work)