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bonding: remove unwanted lock for bond enslave and release 

The bond_change_active_slave() and bond_select_active_slave()
do't need bond lock anymore, so remove the unwanted bond lock
for these two functions.

The bond_select_active_slave() will release and acquire
curr_slave_lock, so the curr_slave_lock need to protect
the function.

In bond enslave and bond release, the bond slave list is also
protected by RTNL, so bond lock is no need to exist, remove
the lock and clean the functions.

Suggested-by: Jay Vosburgh <fubar@us.ibm.com>
Suggested-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
dingtianhong 2013-12-13 10:20:07 +08:00 committed by David S. Miller
parent eb9fa4b019
commit c851703544
1 changed files with 6 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/net/bonding/bond_main.c
View File

@ -1589,11 +1589,9 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
bond_set_carrier(bond);
if (USES_PRIMARY(bond->params.mode)) {
read_lock(&bond->lock);
write_lock_bh(&bond->curr_slave_lock);
bond_select_active_slave(bond);
write_unlock_bh(&bond->curr_slave_lock);
read_unlock(&bond->lock);
}
pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
@ -1613,19 +1611,13 @@ err_detach:
bond_hw_addr_flush(bond_dev, slave_dev);
vlan_vids_del_by_dev(slave_dev, bond_dev);
write_lock_bh(&bond->lock);
if (bond->primary_slave == new_slave)
bond->primary_slave = NULL;
if (bond->curr_active_slave == new_slave) {
bond_change_active_slave(bond, NULL);
write_unlock_bh(&bond->lock);
read_lock(&bond->lock);
write_lock_bh(&bond->curr_slave_lock);
bond_change_active_slave(bond, NULL);
bond_select_active_slave(bond);
write_unlock_bh(&bond->curr_slave_lock);
read_unlock(&bond->lock);
} else {
write_unlock_bh(&bond->lock);
}
slave_disable_netpoll(new_slave);
@ -1690,20 +1682,16 @@ static int __bond_release_one(struct net_device *bond_dev,
}
block_netpoll_tx();
write_lock_bh(&bond->lock);
slave = bond_get_slave_by_dev(bond, slave_dev);
if (!slave) {
/* not a slave of this bond */
pr_info("%s: %s not enslaved\n",
bond_dev->name, slave_dev->name);
write_unlock_bh(&bond->lock);
unblock_netpoll_tx();
return -EINVAL;
}
write_unlock_bh(&bond->lock);
/* release the slave from its bond */
bond->slave_cnt--;
@ -1721,6 +1709,7 @@ static int __bond_release_one(struct net_device *bond_dev,
*/
bond_3ad_unbind_slave(slave);
}
write_unlock_bh(&bond->lock);
pr_info("%s: releasing %s interface %s\n",
bond_dev->name,
@ -1743,8 +1732,11 @@ static int __bond_release_one(struct net_device *bond_dev,
if (bond->primary_slave == slave)
bond->primary_slave = NULL;
if (oldcurrent == slave)
if (oldcurrent == slave) {
write_lock_bh(&bond->curr_slave_lock);
bond_change_active_slave(bond, NULL);
write_unlock_bh(&bond->curr_slave_lock);
}
if (bond_is_lb(bond)) {
/* Must be called only after the slave has been
@ -1752,9 +1744,7 @@ static int __bond_release_one(struct net_device *bond_dev,
* has been cleared (if our_slave == old_current),
* but before a new active slave is selected.
*/
write_unlock_bh(&bond->lock);
bond_alb_deinit_slave(bond, slave);
write_lock_bh(&bond->lock);
}
if (all) {
@ -1765,15 +1755,11 @@ static int __bond_release_one(struct net_device *bond_dev,
* is no concern that another slave add/remove event
* will interfere.
*/
write_unlock_bh(&bond->lock);
read_lock(&bond->lock);
write_lock_bh(&bond->curr_slave_lock);
bond_select_active_slave(bond);
write_unlock_bh(&bond->curr_slave_lock);
read_unlock(&bond->lock);
write_lock_bh(&bond->lock);
}
if (!bond_has_slaves(bond)) {
@ -1788,7 +1774,6 @@ static int __bond_release_one(struct net_device *bond_dev,
}
}
write_unlock_bh(&bond->lock);
unblock_netpoll_tx();
synchronize_rcu();