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>

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 187b1b7..d6fe00b 100644 (file)
--- 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);
 }
 
 /**