[PATCH] lockdep: annotate vlan net device as being a special class

vlan network devices have devices nesting below it, and are a special
"super class" of normal network devices; split their locks off into a
separate class since they always nest.

[deweerdt@free.fr: fix possible null-pointer deref]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 3948949..458031b 100644 (file)
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -364,6 +364,14 @@ static void vlan_transfer_operstate(const struct net_device *dev, struct net_dev
        }
 }
 
+/*
+ * vlan network devices have devices nesting below it, and are a special
+ * "super class" of normal network devices; split their locks off into a
+ * separate class since they always nest.
+ */
+static struct lock_class_key vlan_netdev_xmit_lock_key;
+
+
 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
  *  Returns the device that was created, or NULL if there was
  *  an error of some kind.
@@ -460,6 +468,7 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
                    
        new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
                               vlan_setup);
+
        if (new_dev == NULL)
                goto out_unlock;
 
@@ -518,6 +527,8 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
        if (register_netdevice(new_dev))
                goto out_free_newdev;
 
+       lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
+
        new_dev->iflink = real_dev->ifindex;
        vlan_transfer_operstate(real_dev, new_dev);
        linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */