diff options
| author | Veaceslav Falico <vfalico@redhat.com> | 2014-01-27 14:37:31 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-01-27 13:12:45 -0800 |
| commit | 98b90f26651f9d84cfbb0221c9a3d9863c5bea69 (patch) | |
| tree | 3dcef360c8235cde2cbd254f829d87473fc7b2cc /drivers/net | |
| parent | bb9fbe2ddd6d6111c5fe5987fa1e71da7d2ab854 (diff) | |
| download | linux-98b90f26651f9d84cfbb0221c9a3d9863c5bea69.tar.bz2 | |
bonding: RCUify bond_ab_arp_probe
Currently bond_ab_arp_probe() is always called under rcu_read_lock(),
however to work with curr_active_slave we're still holding the
curr_slave_lock.
To remove that curr_slave_lock - rcu_dereference the bond's
curr_active_slave and use it further - so that we're sure the slave won't
go away, and we don't care if it will change in the meanwhile.
CC: Jay Vosburgh <fubar@us.ibm.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index a7db819bca92..27e6fddb2206 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2605,25 +2605,21 @@ do_failover: static void bond_ab_arp_probe(struct bonding *bond) { struct slave *slave, *before = NULL, *new_slave = NULL, - *curr_arp_slave = rcu_dereference(bond->current_arp_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; - read_lock(&bond->curr_slave_lock); - - if (curr_arp_slave && bond->curr_active_slave) + if (curr_arp_slave && curr_active_slave) pr_info("PROBE: c_arp %s && cas %s BAD\n", curr_arp_slave->dev->name, - bond->curr_active_slave->dev->name); + curr_active_slave->dev->name); - if (bond->curr_active_slave) { - bond_arp_send_all(bond, bond->curr_active_slave); - read_unlock(&bond->curr_slave_lock); + if (curr_active_slave) { + bond_arp_send_all(bond, curr_active_slave); return; } - read_unlock(&bond->curr_slave_lock); - /* 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 |