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-rw-r--r--net/8021q/vlan.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 3948949a609a..458031bfff55 100644
--- 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() */