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_core_main.c

@@ -537,6 +537,7 @@ static void qeth_send_control_data_cb(struct qeth_channel *channel,
 			dev_err(&card->gdev->dev,
 				"The qeth device is not configured "
 				"for the OSI layer required by z/VM\n");
+		else
 			qeth_schedule_recovery(card);
 		goto out;
 	}

drivers/s390/net/qeth_l2_main.c

@@ -1071,11 +1071,9 @@ static int qeth_l2_recover(void *ptr)
 		dev_info(&card->gdev->dev,
 			"Device successfully recovered!\n");
 	else {
-		if (card->dev) {
 		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");
 	}
@@ -1129,12 +1127,10 @@ static int qeth_l2_pm_resume(struct ccwgroup_device *gdev)
 	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();
 		}
-		}
 	} else
 		rc = __qeth_l2_set_online(card->gdev, 0);
 out:

drivers/s390/net/qeth_l3_main.c

@@ -2219,12 +2219,10 @@ static int qeth_l3_stop_card(struct qeth_card *card, int recovery_mode)
 		if (recovery_mode)
 			qeth_l3_stop(card->dev);
 		else {
-			if (card->dev) {
 			rtnl_lock();
 			dev_close(card->dev);
 			rtnl_unlock();
 		}
-		}
 		if (!card->use_hard_stop) {
 			rc = qeth_send_stoplan(card);
 			if (rc)
@@ -3536,12 +3534,10 @@ static int qeth_l3_pm_resume(struct ccwgroup_device *gdev)
 	if (card->state == CARD_STATE_RECOVER) {
 		rc = __qeth_l3_set_online(card->gdev, 1);
 		if (rc) {
-			if (card->dev) {
 			rtnl_lock();
 			dev_close(card->dev);
 			rtnl_unlock();
 		}
-		}
 	} else
 		rc = __qeth_l3_set_online(card->gdev, 0);
 out: