vlan: fix bond/team enslave of vlan challenged slave/port

In vlan_uses_dev() check for number of vlan devs rather than existence
of vlan_info. The reason is that vlan id 0 is there without appropriate
vlan dev on it by default which prevented from enslaving vlan challenged
dev.

Reported-by: Jon Stanley <jstanley@rmrf.net>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
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 b721902..b2530b0 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1519,7 +1519,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
        /* no need to lock since we're protected by rtnl_lock */
        if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
                pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
-               if (bond_vlan_used(bond)) {
+               if (vlan_uses_dev(bond_dev)) {
                        pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
                               bond_dev->name, slave_dev->name, bond_dev->name);
                        return -EPERM;

diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index fbbf1fa..65e06ab 100644 (file)
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -366,6 +366,13 @@ EXPORT_SYMBOL(vlan_vids_del_by_dev);
 
 bool vlan_uses_dev(const struct net_device *dev)
 {
-       return rtnl_dereference(dev->vlan_info) ? true : false;
+       struct vlan_info *vlan_info;
+
+       ASSERT_RTNL();
+
+       vlan_info = rtnl_dereference(dev->vlan_info);
+       if (!vlan_info)
+               return false;
+       return vlan_info->grp.nr_vlan_devs ? true : false;
 }
 EXPORT_SYMBOL(vlan_uses_dev);