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authorSabrina Dubroca <sd@queasysnail.net>2016-08-12 17:10:33 +0300
committerDavid S. Miller <davem@davemloft.net>2016-08-14 01:15:54 +0300
commit952fcfd08c8109951622579d0ae7b9cd6cafd688 (patch)
tree16e787138d3da28899e3a0028962928c79a4af07 /drivers/net/macvlan.c
parente20038724552cd05e351cd7d7526d646953d26b7 (diff)
downloadlinux-952fcfd08c8109951622579d0ae7b9cd6cafd688.tar.xz
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/macvlan.c')
-rw-r--r--drivers/net/macvlan.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index cd9b53834bf6..3234fcdea317 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1315,7 +1315,7 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
vlan->dev = dev;
vlan->port = port;
vlan->set_features = MACVLAN_FEATURES;
- vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
+ vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
vlan->mode = MACVLAN_MODE_VEPA;
if (data && data[IFLA_MACVLAN_MODE])