diff options
author | dingtianhong <dingtianhong@huawei.com> | 2013-10-24 03:09:31 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2013-10-27 20:36:29 (GMT) |
commit | 5cc172c6de80cd9bf2a1228cb928b1fb42e30deb (patch) | |
tree | 2acba486e276d99f77d9c187bf67e8cfb581fde2 /drivers/net/bonding/bond_3ad.c | |
parent | 80b9d236ec56ecc18da4a43bd79e8ec9ac5036ff (diff) | |
download | linux-5cc172c6de80cd9bf2a1228cb928b1fb42e30deb.tar.xz |
bonding: remove bond read lock for bond_3ad_state_machine_handler()
The bond slave list may change when the monitor is running, the slave list is no longer
protected by bond->lock, only protected by rtnl lock(), so we have 3 ways to modify it:
1.add bond_master_upper_dev_link() and bond_upper_dev_unlink() in bond->lock, but it is unsafe
to call call_netdevice_notifiers() in write lock.
2.remove unused bond->lock for monitor function, only use the existing rtnl lock().
3.use rcu_read_lock() to protect it, of course, it will transform bond_for_each_slave to
bond_for_each_slave_rcu() and performance is better, but in slow path, it is ignored.
so I remove the bond->lock and move the rtnl lock to protect the whole monitor function.
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/bonding/bond_3ad.c')
-rw-r--r-- | drivers/net/bonding/bond_3ad.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c index 187b1b7..d6fe00b 100644 --- a/drivers/net/bonding/bond_3ad.c +++ b/drivers/net/bonding/bond_3ad.c @@ -2068,8 +2068,10 @@ void bond_3ad_state_machine_handler(struct work_struct *work) struct slave *slave; struct port *port; - read_lock(&bond->lock); - + if (!rtnl_trylock()) { + queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks); + return; + } //check if there are any slaves if (!bond_has_slaves(bond)) goto re_arm; @@ -2122,9 +2124,8 @@ void bond_3ad_state_machine_handler(struct work_struct *work) } re_arm: + rtnl_unlock(); queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks); - - read_unlock(&bond->lock); } /** |