s390/qeth: fix qdio teardown after early init error

qeth_l?_set_online() goes through a number of initialization steps, and
on any error uses qeth_l?_stop_card() to tear down the residual state.

The first initialization step is qeth_core_hardsetup_card(). When this
fails after having established a QDIO context on the device
(ie. somewhere after qeth_mpc_initialize()), qeth_l?_stop_card() doesn't
shut down this QDIO context again (since the card state hasn't
progressed from DOWN at this stage).

Even worse, we then call qdio_free() as final teardown step to free the
QDIO data structures - while some of them are still hooked into wider
QDIO infrastructure such as the IRQ list. This is inevitably followed by
use-after-frees and other nastyness.

Fix this by unconditionally calling qeth_qdio_clear_card() to shut down
the QDIO context, and also to halt/clear any pending activity on the
various IO channels.
Remove the naive attempt at handling the teardown in
qeth_mpc_initialize(), it clearly doesn't suffice and we're handling it
properly now in the wider teardown code.

Fixes: 4a71df50047f ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index bc41588..324cf22 100644 (file)
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2482,50 +2482,46 @@ static int qeth_mpc_initialize(struct qeth_card *card)
        rc = qeth_cm_enable(card);
        if (rc) {
                QETH_CARD_TEXT_(card, 2, "2err%d", rc);
-               goto out_qdio;
+               return rc;
        }
        rc = qeth_cm_setup(card);
        if (rc) {
                QETH_CARD_TEXT_(card, 2, "3err%d", rc);
-               goto out_qdio;
+               return rc;
        }
        rc = qeth_ulp_enable(card);
        if (rc) {
                QETH_CARD_TEXT_(card, 2, "4err%d", rc);
-               goto out_qdio;
+               return rc;
        }
        rc = qeth_ulp_setup(card);
        if (rc) {
                QETH_CARD_TEXT_(card, 2, "5err%d", rc);
-               goto out_qdio;
+               return rc;
        }
        rc = qeth_alloc_qdio_queues(card);
        if (rc) {
                QETH_CARD_TEXT_(card, 2, "5err%d", rc);
-               goto out_qdio;
+               return rc;
        }
        rc = qeth_qdio_establish(card);
        if (rc) {
                QETH_CARD_TEXT_(card, 2, "6err%d", rc);
                qeth_free_qdio_queues(card);
-               goto out_qdio;
+               return rc;
        }
        rc = qeth_qdio_activate(card);
        if (rc) {
                QETH_CARD_TEXT_(card, 2, "7err%d", rc);
-               goto out_qdio;
+               return rc;
        }
        rc = qeth_dm_act(card);
        if (rc) {
                QETH_CARD_TEXT_(card, 2, "8err%d", rc);
-               goto out_qdio;
+               return rc;
        }
 
        return 0;
-out_qdio:
-       qeth_qdio_clear_card(card, !IS_IQD(card));
-       qdio_free(CARD_DDEV(card));
-       return rc;
 }
 
 void qeth_print_status_message(struct qeth_card *card)

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 8c95e60..15e2fd6 100644 (file)
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -287,12 +287,12 @@ static void qeth_l2_stop_card(struct qeth_card *card)
                card->state = CARD_STATE_HARDSETUP;
        }
        if (card->state == CARD_STATE_HARDSETUP) {
-               qeth_qdio_clear_card(card, 0);
                qeth_drain_output_queues(card);
                qeth_clear_working_pool_list(card);
                card->state = CARD_STATE_DOWN;
        }
 
+       qeth_qdio_clear_card(card, 0);
        flush_workqueue(card->event_wq);
        card->info.mac_bits &= ~QETH_LAYER2_MAC_REGISTERED;
        card->info.promisc_mode = 0;

diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 04e301d..5508ab8 100644 (file)
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1307,12 +1307,12 @@ static void qeth_l3_stop_card(struct qeth_card *card)
                card->state = CARD_STATE_HARDSETUP;
        }
        if (card->state == CARD_STATE_HARDSETUP) {
-               qeth_qdio_clear_card(card, 0);
                qeth_drain_output_queues(card);
                qeth_clear_working_pool_list(card);
                card->state = CARD_STATE_DOWN;
        }
 
+       qeth_qdio_clear_card(card, 0);
        flush_workqueue(card->event_wq);
        card->info.promisc_mode = 0;
 }