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authorArjan van de Ven <arjan@linux.intel.com>2006-07-03 00:25:33 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:10 -0700
commit5dd8d1e9eb8b51041505966fe96d081ecbe86efe (patch)
treeeba7299734a893016d4e91d92cb25974a626bc61
parent663d440eaa496db903cc58be04b9b602ba45e43b (diff)
[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>
-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 3948949a609..458031bfff5 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() */