qeth: no recovery after layer mismatch (z/VM NICs)

Depending on their definition in z/VM, virtual devices for z/VM
VSWITCH or GuestLAN must be configured either in layer2 or in
layer3 mode. If qeth detects a layer mismatch, device activation
fails. Trying to recover from this error cannot help; thus
scheduling a recovery should be avoided.
In addition, since recovery is forbidden during online setting of
a qeth device, existence of its network device is guaranteed for all
dev_close() calls in qeth. The corresponding checks can be removed.

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_l2_main.c

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 51fde6f..6f1e303 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -1071,11 +1071,9 @@
 		dev_info(&card->gdev->dev,
 			"Device successfully recovered!\n");
 	else {
-		if (card->dev) {
-			rtnl_lock();
-			dev_close(card->dev);
-			rtnl_unlock();
-		}
+		rtnl_lock();
+		dev_close(card->dev);
+		rtnl_unlock();
 		dev_warn(&card->gdev->dev, "The qeth device driver "
 			"failed to recover an error on the device\n");
 	}
@@ -1129,11 +1127,9 @@
 	if (card->state == CARD_STATE_RECOVER) {
 		rc = __qeth_l2_set_online(card->gdev, 1);
 		if (rc) {
-			if (card->dev) {
-				rtnl_lock();
-				dev_close(card->dev);
-				rtnl_unlock();
-			}
+			rtnl_lock();
+			dev_close(card->dev);
+			rtnl_unlock();
 		}
 	} else
 		rc = __qeth_l2_set_online(card->gdev, 0);