From: Jarek Poplawski Date: Fri, 11 Jan 2008 06:38:31 +0000 (-0800) Subject: [VLAN]: nested VLAN: fix lockdep's recursive locking warning X-Git-Tag: firefly_0821_release~23809^2~5 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0fe1e567d0b4f6a98e94d3b9a40f41c801bd157f;p=firefly-linux-kernel-4.4.55.git [VLAN]: nested VLAN: fix lockdep's recursive locking warning Allow vlans nesting other vlans without lockdep's warnings (max. 2 levels i.e. parent + child). Thanks to Patrick McHardy for pointing a bug in the first version of this patch. Reported-by: Benny Amorsen Signed-off-by: Jarek Poplawski Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c index 4add9bd4bc8d..032bf44eca5e 100644 --- a/net/8021q/vlan.c +++ b/net/8021q/vlan.c @@ -323,6 +323,7 @@ static const struct header_ops vlan_header_ops = { static int vlan_dev_init(struct net_device *dev) { struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev; + int subclass = 0; /* IFF_BROADCAST|IFF_MULTICAST; ??? */ dev->flags = real_dev->flags & ~IFF_UP; @@ -349,7 +350,11 @@ static int vlan_dev_init(struct net_device *dev) dev->hard_start_xmit = vlan_dev_hard_start_xmit; } - lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key); + if (real_dev->priv_flags & IFF_802_1Q_VLAN) + subclass = 1; + + lockdep_set_class_and_subclass(&dev->_xmit_lock, + &vlan_netdev_xmit_lock_key, subclass); return 0; }