diff options
| author | nikolay@redhat.com <nikolay@redhat.com> | 2013-09-02 13:51:38 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-09-04 00:27:24 -0400 |
| commit | 6c8d23f78646b20bdbdad476d015b6594ac8ff1c (patch) | |
| tree | f3bc75b01a5871be54c022a303e0eac8c791cc98 /drivers/net/bonding/bond_main.c | |
| parent | f7c6be404d8fa52c54ff931390aab01e5c7654d6 (diff) | |
| download | lwn-6c8d23f78646b20bdbdad476d015b6594ac8ff1c.tar.gz lwn-6c8d23f78646b20bdbdad476d015b6594ac8ff1c.zip | |
bonding: simplify and fix peer notification
This patch aims to remove a use of the bond->lock for mutual exclusion
which will later allow easier migration to RCU of the users of this
functionality. We use RTNL as a synchronizing mechanism since it's
always held when send_peer_notif is set, and when it is decremented from
the notifier function. We can also drop some locking, and fix the
leakage of the send_peer_notif counter.
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.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 | 22 |
1 files changed, 7 insertions, 15 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index c50679f0a6b6..05e638b8ea25 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -828,7 +828,6 @@ static bool bond_should_notify_peers(struct bonding *bond) test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) return false; - bond->send_peer_notif--; return true; } @@ -2259,12 +2258,8 @@ re_arm: read_unlock(&bond->lock); if (should_notify_peers) { - if (!rtnl_trylock()) { - read_lock(&bond->lock); - bond->send_peer_notif++; - read_unlock(&bond->lock); + if (!rtnl_trylock()) return; - } call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); rtnl_unlock(); } @@ -2876,12 +2871,8 @@ re_arm: read_unlock(&bond->lock); if (should_notify_peers) { - if (!rtnl_trylock()) { - read_lock(&bond->lock); - bond->send_peer_notif++; - read_unlock(&bond->lock); + if (!rtnl_trylock()) return; - } call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); rtnl_unlock(); } @@ -2916,6 +2907,10 @@ static int bond_master_netdev_event(unsigned long event, case NETDEV_REGISTER: bond_create_proc_entry(event_bond); break; + case NETDEV_NOTIFY_PEERS: + if (event_bond->send_peer_notif) + event_bond->send_peer_notif--; + break; default: break; } @@ -3213,11 +3208,8 @@ static int bond_close(struct net_device *bond_dev) { struct bonding *bond = netdev_priv(bond_dev); - write_lock_bh(&bond->lock); - bond->send_peer_notif = 0; - write_unlock_bh(&bond->lock); - bond_work_cancel_all(bond); + bond->send_peer_notif = 0; if (bond_is_lb(bond)) { /* Must be called only after all * slaves have been released |