net: Fix vlan_features propagation

Fix VLAN features propagation for devices which change vlan_features.
For this to work, driver needs to make sure netdev_features_changed()
gets called after the change (it is e.g. after ndo_set_features()).

Side effect is that a user might request features that will never
be enabled on a VLAN device.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 58f8010e1ae..f247f5bff88 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -528,7 +528,7 @@ static int vlan_dev_init(struct net_device *dev)
                                           (1<<__LINK_STATE_DORMANT))) |
                       (1<<__LINK_STATE_PRESENT);
 
-        dev->hw_features = real_dev->vlan_features & NETIF_F_ALL_TX_OFFLOADS;
+        dev->hw_features = NETIF_F_ALL_TX_OFFLOADS;
         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
         dev->gso_max_size = real_dev->gso_max_size;
 
@@ -587,9 +587,11 @@ static u32 vlan_dev_fix_features(struct net_device *dev, u32 features)
 {
         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 
-        features &= (real_dev->features | NETIF_F_LLTX);
+        features &= real_dev->features;
+        features &= real_dev->vlan_features;
         if (dev_ethtool_get_rx_csum(real_dev))
                 features |= NETIF_F_RXCSUM;
+        features |= NETIF_F_LLTX;
 
         return features;
 }