diff options
author | dingtianhong <dingtianhong@huawei.com> | 2013-10-24 11:09:03 +0800 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2013-10-27 16:36:28 -0400 |
commit | 6b6c526147bb00b5788a2f48463481dd30c29b71 (patch) | |
tree | 7332c6151f274a5178699974ffde90122d8a183e /drivers | |
parent | a00f6fcc7d0c62a91768d9c4ccba4c7d64fbbce3 (diff) | |
download | linux-6b6c526147bb00b5788a2f48463481dd30c29b71.tar.bz2 |
bonding: remove bond read lock for bond_mii_monitor()
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')
-rw-r--r-- | drivers/net/bonding/bond_main.c | 44 |
1 files changed, 12 insertions, 32 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index a141f406cb98..0a7e32578540 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2118,49 +2118,29 @@ void bond_mii_monitor(struct work_struct *work) struct bonding *bond = container_of(work, struct bonding, mii_work.work); bool should_notify_peers = false; - unsigned long delay; - read_lock(&bond->lock); - - delay = msecs_to_jiffies(bond->params.miimon); + if (!rtnl_trylock()) + goto re_arm; - if (!bond_has_slaves(bond)) + if (!bond_has_slaves(bond)) { + rtnl_unlock(); goto re_arm; + } should_notify_peers = bond_should_notify_peers(bond); - if (bond_miimon_inspect(bond)) { - read_unlock(&bond->lock); - - /* Race avoidance with bond_close cancel of workqueue */ - if (!rtnl_trylock()) { - read_lock(&bond->lock); - delay = 1; - should_notify_peers = false; - goto re_arm; - } - - read_lock(&bond->lock); - + if (bond_miimon_inspect(bond)) bond_miimon_commit(bond); - read_unlock(&bond->lock); - rtnl_unlock(); /* might sleep, hold no other locks */ - read_lock(&bond->lock); - } + if (should_notify_peers) + call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); + + rtnl_unlock(); re_arm: if (bond->params.miimon) - queue_delayed_work(bond->wq, &bond->mii_work, delay); - - read_unlock(&bond->lock); - - if (should_notify_peers) { - if (!rtnl_trylock()) - return; - call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); - rtnl_unlock(); - } + queue_delayed_work(bond->wq, &bond->mii_work, + msecs_to_jiffies(bond->params.miimon)); } static bool bond_has_this_ip(struct bonding *bond, __be32 ip) |