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authorSabrina Dubroca <sd@queasysnail.net>2016-08-12 16:10:33 +0200
committerDavid S. Miller <davem@davemloft.net>2016-08-13 15:15:54 -0700
commit952fcfd08c8109951622579d0ae7b9cd6cafd688 (patch)
tree16e787138d3da28899e3a0028962928c79a4af07 /drivers/net/macsec.c
parente20038724552cd05e351cd7d7526d646953d26b7 (diff)
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net: remove type_check from dev_get_nest_level()
The idea for type_check in dev_get_nest_level() was to count the number of nested devices of the same type (currently, only macvlan or vlan devices). This prevented the false positive lockdep warning on configurations such as: eth0 <--- macvlan0 <--- vlan0 <--- macvlan1 However, this doesn't prevent a warning on a configuration such as: eth0 <--- macvlan0 <--- vlan0 eth1 <--- vlan1 <--- macvlan1 In this case, all the locks end up with a nesting subclass of 1, so lockdep thinks that there is still a deadlock: - in the first case we have (macvlan_netdev_addr_lock_key, 1) and then take (vlan_netdev_xmit_lock_key, 1) - in the second case, we have (vlan_netdev_xmit_lock_key, 1) and then take (macvlan_netdev_addr_lock_key, 1) By removing the linktype check in dev_get_nest_level() and always incrementing the nesting depth, lockdep considers this configuration valid. Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/macsec.c')
-rw-r--r--drivers/net/macsec.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 2043e8c97a81..351e701eb043 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -3201,7 +3201,7 @@ static int macsec_newlink(struct net *net, struct net_device *dev,
dev_hold(real_dev);
- macsec->nest_level = dev_get_nest_level(real_dev, netif_is_macsec) + 1;
+ macsec->nest_level = dev_get_nest_level(real_dev) + 1;
netdev_lockdep_set_classes(dev);
lockdep_set_class_and_subclass(&dev->addr_list_lock,
&macsec_netdev_addr_lock_key,