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authorJay Vosburgh <fubar@us.ibm.com>2008-01-29 18:07:44 -0800
committerDavid S. Miller <davem@davemloft.net>2008-02-03 04:28:12 -0800
commit80ee5ad23150f1f3fe8d35728e860850ccea44da (patch)
tree4bab44a6762a87c59ba22ab688326f1a6fe075a1 /drivers/net
parenta42e534f1b6be7f2f68f83d29588c3f2736b4d25 (diff)
bonding: fix set_multicast_list locking
This patch eliminates a problem (reported by lockdep) in the bond_set_multicast_list function. It first reduces the locking on bond->lock to a simple read_lock, and second, adds netif_tx locking around the bonding mc_list manipulations that occur outside of the set_multicast_list function. The original problem was related to IPv6 addrconf activity. Signed-off-by: Jay Vosburgh <fubar@us.ibm.com> Signed-off-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/bonding/bond_main.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 2766855a5ae..65c7ebafaac 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1464,10 +1464,12 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
dev_set_allmulti(slave_dev, 1);
}
+ netif_tx_lock_bh(bond_dev);
/* upload master's mc_list to new slave */
for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
}
+ netif_tx_unlock_bh(bond_dev);
}
if (bond->params.mode == BOND_MODE_8023AD) {
@@ -1821,7 +1823,9 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
}
/* flush master's mc_list from slave */
+ netif_tx_lock_bh(bond_dev);
bond_mc_list_flush(bond_dev, slave_dev);
+ netif_tx_unlock_bh(bond_dev);
}
netdev_set_master(slave_dev, NULL);
@@ -1942,7 +1946,9 @@ static int bond_release_all(struct net_device *bond_dev)
}
/* flush master's mc_list from slave */
+ netif_tx_lock_bh(bond_dev);
bond_mc_list_flush(bond_dev, slave_dev);
+ netif_tx_unlock_bh(bond_dev);
}
netdev_set_master(slave_dev, NULL);
@@ -3937,8 +3943,6 @@ static void bond_set_multicast_list(struct net_device *bond_dev)
struct bonding *bond = bond_dev->priv;
struct dev_mc_list *dmi;
- write_lock_bh(&bond->lock);
-
/*
* Do promisc before checking multicast_mode
*/
@@ -3959,6 +3963,8 @@ static void bond_set_multicast_list(struct net_device *bond_dev)
bond_set_allmulti(bond, -1);
}
+ read_lock(&bond->lock);
+
bond->flags = bond_dev->flags;
/* looking for addresses to add to slaves' mc list */
@@ -3979,7 +3985,7 @@ static void bond_set_multicast_list(struct net_device *bond_dev)
bond_mc_list_destroy(bond);
bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
- write_unlock_bh(&bond->lock);
+ read_unlock(&bond->lock);
}
/*
@@ -4526,7 +4532,9 @@ static void bond_free_all(void)
struct net_device *bond_dev = bond->dev;
bond_work_cancel_all(bond);
+ netif_tx_lock_bh(bond_dev);
bond_mc_list_destroy(bond);
+ netif_tx_unlock_bh(bond_dev);
/* Release the bonded slaves */
bond_release_all(bond_dev);
bond_deinit(bond_dev);