8139cp: fix VLAN unregistration

The 8139cp driver did VLAN unregistration incorrectly.
It disables VLAN completely when the first VID is unregistered. It
should instead disable VLAN when the group is unregistered by calling
cp_vlan_rx_register with a NULL grp.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/8139cp.c

@@ -435,20 +435,12 @@ static void cp_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
 
 	spin_lock_irqsave(&cp->lock, flags);
 	cp->vlgrp = grp;
-	cp->cpcmd |= RxVlanOn;
-	cpw16(CpCmd, cp->cpcmd);
-	spin_unlock_irqrestore(&cp->lock, flags);
-}
-
-static void cp_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
-{
-	struct cp_private *cp = netdev_priv(dev);
-	unsigned long flags;
+	if (grp)
+		cp->cpcmd |= RxVlanOn;
+	else
+		cp->cpcmd &= ~RxVlanOn;
 
-	spin_lock_irqsave(&cp->lock, flags);
-	cp->cpcmd &= ~RxVlanOn;
 	cpw16(CpCmd, cp->cpcmd);
-	vlan_group_set_device(cp->vlgrp, vid, NULL);
 	spin_unlock_irqrestore(&cp->lock, flags);
 }
 #endif /* CP_VLAN_TAG_USED */
@@ -1944,7 +1936,6 @@ static int cp_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 #if CP_VLAN_TAG_USED
 	dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
 	dev->vlan_rx_register = cp_vlan_rx_register;
-	dev->vlan_rx_kill_vid = cp_vlan_rx_kill_vid;
 #endif
 
 	if (pci_using_dac)