s390/qeth: fix discipline unload after setup error

Device initialization code usually first loads a subdriver
(via qeth_core_load_discipline()), and then runs its setup() callback.
If this fails, it rolls back the load via qeth_core_free_discipline().

qeth_core_free_discipline() expects the options.layer attribute to be
initialized, but on error in setup() that's currently not the case.
Resulting in misbalanced symbol_put() calls.

Fix this by setting options.layer when loading the subdriver.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_core_main.c

@@ -5614,6 +5614,7 @@ int qeth_core_load_discipline(struct qeth_card *card,
 		return -EINVAL;
 	}
 
+	card->options.layer = discipline;
 	return 0;
 }
 
@@ -5623,6 +5624,7 @@ void qeth_core_free_discipline(struct qeth_card *card)
 		symbol_put(qeth_l2_discipline);
 	else
 		symbol_put(qeth_l3_discipline);
+	card->options.layer = QETH_DISCIPLINE_UNDETERMINED;
 	card->discipline = NULL;
 }
 

drivers/s390/net/qeth_core_sys.c

@@ -432,8 +432,6 @@ static ssize_t qeth_dev_layer2_store(struct device *dev,
 
 		card->discipline->remove(card->gdev);
 		qeth_core_free_discipline(card);
-		card->options.layer = QETH_DISCIPLINE_UNDETERMINED;
-
 		free_netdev(card->dev);
 		card->dev = ndev;
 	}

drivers/s390/net/qeth_l2_main.c

@@ -806,7 +806,6 @@ static int qeth_l2_probe_device(struct ccwgroup_device *gdev)
 	}
 	INIT_LIST_HEAD(&card->vid_list);
 	hash_init(card->mac_htable);
-	card->options.layer = QETH_DISCIPLINE_LAYER2;
 	card->info.hwtrap = 0;
 	qeth_l2_vnicc_set_defaults(card);
 	return 0;

drivers/s390/net/qeth_l3_main.c

@@ -2489,7 +2489,6 @@ static int qeth_l3_probe_device(struct ccwgroup_device *gdev)
 	}
 	hash_init(card->ip_htable);
 	hash_init(card->ip_mc_htable);
-	card->options.layer = QETH_DISCIPLINE_LAYER3;
 	card->info.hwtrap = 0;
 	return 0;
 }