From: Julian Wiedmann jwi@linux.ibm.com
[ Upstream commit 8b5026bc16938920e4780b9094c3bf20e1e0939d ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/s390/net/qeth_core_main.c | 20 ++++++++------------ drivers/s390/net/qeth_l2_main.c | 2 +- drivers/s390/net/qeth_l3_main.c | 2 +- 3 files changed, 10 insertions(+), 14 deletions(-)
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 83794d7494d4..c444210d563b 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -2451,50 +2451,46 @@ 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 4bccdce19b5a..4224a3b7cd07 100644 --- 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; } diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c index d7bfc7a0e4c0..ae5300fef4e3 100644 --- a/drivers/s390/net/qeth_l3_main.c +++ b/drivers/s390/net/qeth_l3_main.c @@ -1426,12 +1426,12 @@ 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); }