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s390/qeth: fix qdio teardown after early init error

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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: 4a71df5004 ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2019-12-23 15:03:21 +01:00 committed by David S. Miller
parent 47d0b2fe23
commit 8b5026bc16
3 changed files with 10 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/s390/net/qeth_core_main.c
View File

@ -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)

2
drivers/s390/net/qeth_l2_main.c
View File

@ -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;

2
drivers/s390/net/qeth_l3_main.c
View File

@ -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;
}