[PATCH net-next 03/15] s390/qeth: fix discipline unload after setup error

[Julian Wiedmann]

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 <j...@linux.ibm.com>
---
 drivers/s390/net/qeth_core_main.c | 2 ++
 drivers/s390/net/qeth_core_sys.c  | 2 --
 drivers/s390/net/qeth_l2_main.c   | 1 -
 drivers/s390/net/qeth_l3_main.c   | 1 -
 4 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/s390/net/qeth_core_main.c 
b/drivers/s390/net/qeth_core_main.c
index c3068f680f67..1fed8f113f40 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/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;
 }
 
diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c
index fdb67af811f4..970f6c71a66e 100644
--- a/drivers/s390/net/qeth_core_sys.c
+++ b/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;
        }
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index afa7a005b21e..02566af7e23d 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/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;
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 552bfad20f85..2756795f7708 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/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;
 }
-- 
2.16.4