vlan: updates vlan real_num_tx_queues

Updates real_num_tx_queues in case underlying real device
has changed real_num_tx_queues.

-v2
 As per Eric Dumazet<[email protected]> comment:-
   -- adds BUG_ON to catch case of real_num_tx_queues exceeding num_tx_queues.
   -- created this self contained patch to just update real_num_tx_queues.

Signed-off-by: Vasu Dev <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 453512266ea1dd783dbc68f5e6b511dd64ec5ac5..db783d7af5a3cd41ab2695c0c7f326e5a266e3f2 100644 (file)
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -378,6 +378,8 @@ 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->real_num_tx_queues = dev->real_num_tx_queues;
+       BUG_ON(vlandev->real_num_tx_queues > vlandev->num_tx_queues);
 
        if (old_features != vlandev->features)
                netdev_features_change(vlandev);