[PATCH] [RFC] vlan: fix updating wanted_features for vlan device

[Yi Zou <yi.zou@intel.com>]

commit 8a0427b "vlan: convert VLAN devices to use ndo_fix_features()" converts the
vlan to support ndo_fix_features. However, the wanted_features is not updated
for the vlan device, causing real_dev->features not be populated to the vlan
device when real_dev->features are changed by the driver through FEAT_CHANGE.
This is breaking FCoE related netdev feature flags on vlan devices. Add updating
wanted_features to vlan_transfer_features() so netdev_get_wanted_features() will
can get the updated wanted feature flags for vlan device properly.

I am sending as RFC in case the usage of wanted_features on vlan device is not
right, since the features chanaged are not directly from user doing ethtool, but
it is from user action of starting to run FCoE on a netdev instance. Anyway, let
let me know if there is a preferred alternative fix.

Signed-off-by: Yi Zou <yi.zou@intel.com>
---

 net/8021q/vlan.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 969e700..f2ee00b 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -332,6 +332,7 @@ static void vlan_transfer_features(struct net_device *dev,
 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 	vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 #endif
+	vlandev->wanted_features |= dev->features & dev->vlan_features;
 
 	netdev_update_features(vlandev);
 }