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Diffstat (limited to 'net/8021q/vlan_dev.c')
-rw-r--r--net/8021q/vlan_dev.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 86ae75b77390..516b0e73263c 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -146,10 +146,12 @@ static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
{
- /* TODO: gotta make sure the underlying layer can handle it,
- * maybe an IFF_VLAN_CAPABLE flag for devices?
- */
- if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
+ struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+ unsigned int max_mtu = real_dev->mtu;
+
+ if (netif_reduces_vlan_mtu(real_dev))
+ max_mtu -= VLAN_HLEN;
+ if (max_mtu < new_mtu)
return -ERANGE;
dev->mtu = new_mtu;