qeth: recognize vlan devices in layer3 mode

The qeth layer3 driver is notified about IP address changes.
Changes concerning qeth driven network interfaces have to be
forwarded to the OSA-card. This includes IP addresses of VLAN
interfaces with a qeth device as base device. Function
qeth_l3_verify_vlan_dev() determines if the net_device of the
IP event belongs to a vlan device belonging to a qeth device
as real device. This function is broken starting with commit
7ff0bcf , which means IP
addresses of VLAN devices are no longer set at the base qeth
device. The patch repairs function qeth_l3_verify_vlan_dev().

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_l3_main.c

@@ -2073,7 +2073,7 @@ static int qeth_l3_verify_vlan_dev(struct net_device *dev,
 		struct net_device *netdev;
 
 		rcu_read_lock();
-		netdev = __vlan_find_dev_deep(dev, vid);
+		netdev = __vlan_find_dev_deep(card->dev, vid);
 		rcu_read_unlock();
 		if (netdev == dev) {
 			rc = QETH_VLAN_CARD;
@@ -3602,9 +3602,9 @@ static int qeth_l3_ip_event(struct notifier_block *this,
 		return NOTIFY_DONE;
 
 	card = qeth_l3_get_card_from_dev(dev);
-	QETH_CARD_TEXT(card, 3, "ipevent");
 	if (!card)
 		return NOTIFY_DONE;
+	QETH_CARD_TEXT(card, 3, "ipevent");
 
 	addr = qeth_l3_get_addr_buffer(QETH_PROT_IPV4);
 	if (addr != NULL) {