diff options
| author | Stefan Raspl <raspl@linux.vnet.ibm.com> | 2013-04-07 22:19:27 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-08 17:16:57 -0400 |
| commit | 65d8013cbdc661f9cb7645148de1facfe3d0c88a (patch) | |
| tree | e2a977f555e08b420b9f4c926792d21cd10aba8a /drivers/s390/net/qeth_core_main.c | |
| parent | f9c41a62bba3f3f7ef3541b2a025e3371bcbba97 (diff) | |
qeth: fix qeth_wait_for_threads() deadlock for OSN devices
Any recovery thread will deadlock when calling qeth_wait_for_threads(), most
notably when triggering a recovery on an OSN device.
This patch will store the recovery thread's task pointer on recovery
invocation and check in qeth_wait_for_threads() respectively to avoid
deadlocks.
Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <blaschka@linux.vnet.ibm.com>
Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390/net/qeth_core_main.c')
| -rw-r--r-- | drivers/s390/net/qeth_core_main.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 0d73a999983d..451f92020599 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -177,6 +177,23 @@ const char *qeth_get_cardname_short(struct qeth_card *card) return "n/a"; } +void qeth_set_recovery_task(struct qeth_card *card) +{ + card->recovery_task = current; +} +EXPORT_SYMBOL_GPL(qeth_set_recovery_task); + +void qeth_clear_recovery_task(struct qeth_card *card) +{ + card->recovery_task = NULL; +} +EXPORT_SYMBOL_GPL(qeth_clear_recovery_task); + +static bool qeth_is_recovery_task(const struct qeth_card *card) +{ + return card->recovery_task == current; +} + void qeth_set_allowed_threads(struct qeth_card *card, unsigned long threads, int clear_start_mask) { @@ -205,6 +222,8 @@ EXPORT_SYMBOL_GPL(qeth_threads_running); int qeth_wait_for_threads(struct qeth_card *card, unsigned long threads) { + if (qeth_is_recovery_task(card)) + return 0; return wait_event_interruptible(card->wait_q, qeth_threads_running(card, threads) == 0); } |