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| author | Ursula Braun <ursula.braun@de.ibm.com> | 2010-07-22 23:15:06 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-07-23 12:36:23 -0700 |
| commit | 908abbb5773213288c8ed033c3313440b31cfbf3 (patch) | |
| tree | 0636237a9398ff6939708cc68f53dacf12d2d5aa /drivers | |
| parent | 9dc48ccc68b9dfc01c2beee2d4317fb3df3fdce9 (diff) | |
| download | linux-908abbb5773213288c8ed033c3313440b31cfbf3.tar.gz linux-908abbb5773213288c8ed033c3313440b31cfbf3.tar.bz2 linux-908abbb5773213288c8ed033c3313440b31cfbf3.zip | |
qeth: avoid loop if ipa command response is missing
If qeth issues an ipa command, but for some reasons the response
never comes back, qeth reaches a timeout.
Reset the irq_pending flag of the write channel in timeout handling
code and trigger a recovery to avoid endless looping for the following
ipa command.
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/net/qeth_core.h | 1 | ||||
| -rw-r--r-- | drivers/s390/net/qeth_core_main.c | 15 |
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h index 41ddf86c3421..d1257768be90 100644 --- a/drivers/s390/net/qeth_core.h +++ b/drivers/s390/net/qeth_core.h @@ -740,6 +740,7 @@ struct qeth_card { struct qeth_qdio_info qdio; struct qeth_perf_stats perf_stats; int use_hard_stop; + int read_or_write_problem; struct qeth_osn_info osn_info; struct qeth_discipline discipline; atomic_t force_alloc_skb; diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index f33da45c35ef..7f3ea77551e3 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -262,6 +262,7 @@ static int qeth_issue_next_read(struct qeth_card *card) QETH_DBF_MESSAGE(2, "%s error in starting next read ccw! " "rc=%i\n", dev_name(&card->gdev->dev), rc); atomic_set(&card->read.irq_pending, 0); + card->read_or_write_problem = 1; qeth_schedule_recovery(card); wake_up(&card->wait_q); } @@ -382,6 +383,7 @@ void qeth_clear_ipacmd_list(struct qeth_card *card) qeth_put_reply(reply); } spin_unlock_irqrestore(&card->lock, flags); + atomic_set(&card->write.irq_pending, 0); } EXPORT_SYMBOL_GPL(qeth_clear_ipacmd_list); @@ -1076,6 +1078,7 @@ static int qeth_setup_card(struct qeth_card *card) card->state = CARD_STATE_DOWN; card->lan_online = 0; card->use_hard_stop = 0; + card->read_or_write_problem = 0; card->dev = NULL; spin_lock_init(&card->vlanlock); spin_lock_init(&card->mclock); @@ -1658,6 +1661,10 @@ int qeth_send_control_data(struct qeth_card *card, int len, QETH_CARD_TEXT(card, 2, "sendctl"); + if (card->read_or_write_problem) { + qeth_release_buffer(iob->channel, iob); + return -EIO; + } reply = qeth_alloc_reply(card); if (!reply) { return -ENOMEM; @@ -1729,6 +1736,9 @@ time_err: spin_unlock_irqrestore(&reply->card->lock, flags); reply->rc = -ETIME; atomic_inc(&reply->received); + atomic_set(&card->write.irq_pending, 0); + qeth_release_buffer(iob->channel, iob); + card->write.buf_no = (card->write.buf_no + 1) % QETH_CMD_BUFFER_NO; wake_up(&reply->wait_q); rc = reply->rc; qeth_put_reply(reply); @@ -2485,6 +2495,10 @@ int qeth_send_ipa_cmd(struct qeth_card *card, struct qeth_cmd_buffer *iob, qeth_prepare_ipa_cmd(card, iob, prot_type); rc = qeth_send_control_data(card, IPA_CMD_LENGTH, iob, reply_cb, reply_param); + if (rc == -ETIME) { + qeth_clear_ipacmd_list(card); + qeth_schedule_recovery(card); + } return rc; } EXPORT_SYMBOL_GPL(qeth_send_ipa_cmd); @@ -3967,6 +3981,7 @@ retriable: else goto retry; } + card->read_or_write_problem = 0; rc = qeth_mpc_initialize(card); if (rc) { QETH_DBF_TEXT_(SETUP, 2, "5err%d", rc); |