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| author | Ding Tianhong | 2014-01-28 04:48:53 +0100 |
|---|---|---|
| committer | David S. Miller | 2014-01-29 08:48:33 +0100 |
| commit | 6fde8f037e604e05df1529e4689041715d6d55d2 (patch) | |
| tree | 4cdf943fb2d475899f0a0d5a40cd4002184faff1 /drivers/net/bonding/bond_main.c | |
| parent | tun: add device name(iff) field to proc fdinfo entry (diff) | |
| download | kernel-qcow2-linux-6fde8f037e604e05df1529e4689041715d6d55d2.tar.gz kernel-qcow2-linux-6fde8f037e604e05df1529e4689041715d6d55d2.tar.xz kernel-qcow2-linux-6fde8f037e604e05df1529e4689041715d6d55d2.zip | |
bonding: fix locking in bond_loadbalance_arp_mon()
The commit 1d3ee88ae0d605629bf369
(bonding: add netlink attributes to slave link dev)
has add rtmsg_ifinfo() in bond_set_active_slave() and
bond_set_backup_slave(), so the two function need to
called in RTNL lock, but bond_loadbalance_arp_mon()
only calling these functions in RCU, warning message
will occurs.
fix this by add a new function bond_slave_state_change(),
which will reset the slave's state after slave link check,
so remove the bond_set_xxx_slave() from the cycle and only
record the slave_state_changed, this will call the new
function to set all slaves to new state in RTNL later.
Cc: Jay Vosburgh <fubar@us.ibm.com>
Cc: Veaceslav Falico <vfalico@redhat.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/bonding/bond_main.c')
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index dd75615d85f2..4c08018d7333 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2346,7 +2346,7 @@ static void bond_loadbalance_arp_mon(struct work_struct *work) arp_work.work); struct slave *slave, *oldcurrent; struct list_head *iter; - int do_failover = 0; + int do_failover = 0, slave_state_changed = 0; if (!bond_has_slaves(bond)) goto re_arm; @@ -2370,7 +2370,7 @@ static void bond_loadbalance_arp_mon(struct work_struct *work) bond_time_in_interval(bond, slave->dev->last_rx, 1)) { slave->link = BOND_LINK_UP; - bond_set_active_slave(slave); + slave_state_changed = 1; /* primary_slave has no meaning in round-robin * mode. the window of a slave being up and @@ -2399,7 +2399,7 @@ static void bond_loadbalance_arp_mon(struct work_struct *work) !bond_time_in_interval(bond, slave->dev->last_rx, 2)) { slave->link = BOND_LINK_DOWN; - bond_set_backup_slave(slave); + slave_state_changed = 1; if (slave->link_failure_count < UINT_MAX) slave->link_failure_count++; @@ -2426,19 +2426,24 @@ static void bond_loadbalance_arp_mon(struct work_struct *work) rcu_read_unlock(); - if (do_failover) { - /* the bond_select_active_slave must hold RTNL - * and curr_slave_lock for write. - */ + if (do_failover || slave_state_changed) { if (!rtnl_trylock()) goto re_arm; - block_netpoll_tx(); - write_lock_bh(&bond->curr_slave_lock); - bond_select_active_slave(bond); + if (slave_state_changed) { + bond_slave_state_change(bond); + } else if (do_failover) { + /* the bond_select_active_slave must hold RTNL + * and curr_slave_lock for write. + */ + block_netpoll_tx(); + write_lock_bh(&bond->curr_slave_lock); - write_unlock_bh(&bond->curr_slave_lock); - unblock_netpoll_tx(); + bond_select_active_slave(bond); + + write_unlock_bh(&bond->curr_slave_lock); + unblock_netpoll_tx(); + } rtnl_unlock(); } |