bonding: check return value of nofitier when changing type
This patch adds the possibility to refuse the bonding type change for
other subsystems (such as for example bridge, vlan, etc.)
Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 7eeb187..cbe9e35 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1480,8 +1480,15 @@
bond_dev->name,
bond_dev->type, slave_dev->type);
- netdev_bonding_change(bond_dev,
- NETDEV_PRE_TYPE_CHANGE);
+ res = netdev_bonding_change(bond_dev,
+ NETDEV_PRE_TYPE_CHANGE);
+ res = notifier_to_errno(res);
+ if (res) {
+ pr_err("%s: refused to change device type\n",
+ bond_dev->name);
+ res = -EBUSY;
+ goto err_undo_flags;
+ }
if (slave_dev->type != ARPHRD_ETHER)
bond_setup_by_slave(bond_dev, slave_dev);
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 726ecd1..813bed7 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2005,7 +2005,7 @@
extern int dev_set_promiscuity(struct net_device *dev, int inc);
extern int dev_set_allmulti(struct net_device *dev, int inc);
extern void netdev_state_change(struct net_device *dev);
-extern void netdev_bonding_change(struct net_device *dev,
+extern int netdev_bonding_change(struct net_device *dev,
unsigned long event);
extern void netdev_features_change(struct net_device *dev);
/* Load a device via the kmod */
diff --git a/net/core/dev.c b/net/core/dev.c
index 1a7e1d1..d1f027c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1084,9 +1084,9 @@
}
EXPORT_SYMBOL(netdev_state_change);
-void netdev_bonding_change(struct net_device *dev, unsigned long event)
+int netdev_bonding_change(struct net_device *dev, unsigned long event)
{
- call_netdevice_notifiers(event, dev);
+ return call_netdevice_notifiers(event, dev);
}
EXPORT_SYMBOL(netdev_bonding_change);