netdev - Re: [PATCH net v2] vlan: Fix lockdep warning when vlan dev handle notification

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Date:	Fri, 14 Mar 2014 22:02:53 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	dingtianhong@...wei.com
Cc:	ben@...adent.org.uk, john.r.fastabend@...el.com, kaber@...sh.net,
	netdev@...r.kernel.org, f.fainelli@...il.com
Subject: Re: [PATCH net v2] vlan: Fix lockdep warning when vlan dev handle
 notification

From: Ding Tianhong <dingtianhong@...wei.com>
Date: Thu, 13 Mar 2014 10:22:18 +0800

> When I open the LOCKDEP config and run these steps:

This doesn't work?

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 4b65aa4..9ad89ff 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -556,10 +556,22 @@ static struct device_type vlan_type = {
 
 static const struct net_device_ops vlan_netdev_ops;
 
+static int vlan_calculate_locking_subclass(struct net_device *real_dev)
+{
+	int subclass = 0;
+
+	while (is_vlan_dev(real_dev)) {
+		subclass++;
+		real_dev = vlan_dev_priv(real_dev)->real_dev;
+	}
+
+	return subclass;
+}
+
 static int vlan_dev_init(struct net_device *dev)
 {
 	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
-	int subclass = 0, i;
+	int subclass, i;
 
 	netif_carrier_off(dev);
 
@@ -604,9 +616,7 @@ static int vlan_dev_init(struct net_device *dev)
 
 	SET_NETDEV_DEVTYPE(dev, &vlan_type);
 
-	if (is_vlan_dev(real_dev))
-		subclass = 1;
-
+	subclass = vlan_calculate_locking_subclass(real_dev);
 	vlan_dev_set_lockdep_class(dev, subclass);
 
 	vlan_dev_priv(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
--
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