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authorAndy Gospodarek <andy@greyhouse.net>2010-06-25 09:50:44 +0000
committerDavid S. Miller <davem@davemloft.net>2010-06-28 23:54:10 -0700
commitc22d7ac844f1cb9c6a5fd20f89ebadc2feef891b (patch)
tree63af10f1115dfdc5ec0c08765ba342b62809d808 /drivers/net
parente2f5b04563786d4b7d7648868de7e941a0649372 (diff)
bonding: prevent netpoll over bonded interfaces
Support for netpoll over bonded interfaces was added here: commit f6dc31a85cd46a959bdd987adad14c3b645e03c1 Author: WANG Cong <amwang@redhat.com> Date: Thu May 6 00:48:51 2010 -0700 bonding: make bonding support netpoll but it is bad enough that we should probably just disable netpoll over bonding until some of the locking logic in the bonding driver is changed or converted completely to RCU. Simple actions like changing the active slave in active-backup mode will hang the box if a high enough printk debugging level is enabled. Keeping the old code around will be good for anyone that wants to work on it (and for after the RCU conversion), so I propose this small patch rather than ripping it all out. Signed-off-by: Andy Gospodarek <andy@greyhouse.net> Signed-off-by: Jay Vosburgh <fubar@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/bonding/bond_main.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 5e12462a9d5e..c3d98dde2f86 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -168,7 +168,7 @@ static int arp_ip_count;
static int bond_mode = BOND_MODE_ROUNDROBIN;
static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
static int lacp_fast;
-
+static int disable_netpoll = 1;
const struct bond_parm_tbl bond_lacp_tbl[] = {
{ "slow", AD_LACP_SLOW},
@@ -1742,15 +1742,23 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
bond_set_carrier(bond);
#ifdef CONFIG_NET_POLL_CONTROLLER
- if (slaves_support_netpoll(bond_dev)) {
- bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
- if (bond_dev->npinfo)
- slave_dev->npinfo = bond_dev->npinfo;
- } else if (!(bond_dev->priv_flags & IFF_DISABLE_NETPOLL)) {
+ /*
+ * Netpoll and bonding is broken, make sure it is not initialized
+ * until it is fixed.
+ */
+ if (disable_netpoll) {
bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
- pr_info("New slave device %s does not support netpoll\n",
- slave_dev->name);
- pr_info("Disabling netpoll support for %s\n", bond_dev->name);
+ } else {
+ if (slaves_support_netpoll(bond_dev)) {
+ bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
+ if (bond_dev->npinfo)
+ slave_dev->npinfo = bond_dev->npinfo;
+ } else if (!(bond_dev->priv_flags & IFF_DISABLE_NETPOLL)) {
+ bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
+ pr_info("New slave device %s does not support netpoll\n",
+ slave_dev->name);
+ pr_info("Disabling netpoll support for %s\n", bond_dev->name);
+ }
}
#endif
read_unlock(&bond->lock);
@@ -1950,8 +1958,11 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
#ifdef CONFIG_NET_POLL_CONTROLLER
read_lock_bh(&bond->lock);
- if (slaves_support_netpoll(bond_dev))
- bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
+
+ /* Make sure netpoll over stays disabled until fixed. */
+ if (!disable_netpoll)
+ if (slaves_support_netpoll(bond_dev))
+ bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
read_unlock_bh(&bond->lock);
if (slave_dev->netdev_ops->ndo_netpoll_cleanup)
slave_dev->netdev_ops->ndo_netpoll_cleanup(slave_dev);