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authorUrsula Braun <ursula.braun@de.ibm.com>2010-07-22 23:15:06 +0000
committerDavid S. Miller <davem@davemloft.net>2010-07-23 12:36:23 -0700
commit908abbb5773213288c8ed033c3313440b31cfbf3 (patch)
tree0636237a9398ff6939708cc68f53dacf12d2d5aa /drivers/s390/net
parent9dc48ccc68b9dfc01c2beee2d4317fb3df3fdce9 (diff)
downloadlinux-linaro-android-908abbb5773213288c8ed033c3313440b31cfbf3.tar.gz
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/s390/net')
-rw-r--r--drivers/s390/net/qeth_core.h1
-rw-r--r--drivers/s390/net/qeth_core_main.c15
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 41ddf86c342..d1257768be9 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 f33da45c35e..7f3ea77551e 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);