From: Klaus D. Wacker <kdwacker@xxxxxxxxxx>
When the lcs irq routine detects channel failures it drives device recovery.
After this event the device is no longer usable for shutdown requests,
because the lcs_irq routine may get wrong channel status information.
In such a case the lcs_irq routine marks the channel in 'error' state.
The channel state comes back to 'running' after restarting the channels.
Signed-off-by: Klaus D. Wacker <kdwacker@xxxxxxxxxx>
Signed-off-by: Ursula Braun <braunu@xxxxxxxxxx>
---
drivers/s390/net/lcs.c | 11 ++++++++---
drivers/s390/net/lcs.h | 1 +
2 files changed, 9 insertions(+), 3 deletions(-)
Index: linux-2.6-uschi/drivers/s390/net/lcs.c
===================================================================
--- linux-2.6-uschi.orig/drivers/s390/net/lcs.c
+++ linux-2.6-uschi/drivers/s390/net/lcs.c
@@ -1400,11 +1400,14 @@ lcs_irq(struct ccw_device *cdev, unsigne
PRINT_WARN("check on device %s, dstat=0x%X, cstat=0x%X \n",
cdev->dev.bus_id, dstat, cstat);
if (rc) {
- lcs_schedule_recovery(card);
- wake_up(&card->wait_q);
- return;
+ channel->state = LCS_CH_STATE_ERROR;
}
}
+ if (channel->state == LCS_CH_STATE_ERROR) {
+ lcs_schedule_recovery(card);
+ wake_up(&card->wait_q);
+ return;
+ }
/* How far in the ccw chain have we processed? */
if ((channel->state != LCS_CH_STATE_INIT) &&
(irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
@@ -1708,6 +1711,8 @@ lcs_stopcard(struct lcs_card *card)
if (card->read.state != LCS_CH_STATE_STOPPED &&
card->write.state != LCS_CH_STATE_STOPPED &&
+ card->read.state != LCS_CH_STATE_ERROR &&
+ card->write.state != LCS_CH_STATE_ERROR &&
card->state == DEV_STATE_UP) {
lcs_clear_multicast_list(card);
rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
Index: linux-2.6-uschi/drivers/s390/net/lcs.h
===================================================================
--- linux-2.6-uschi.orig/drivers/s390/net/lcs.h
+++ linux-2.6-uschi/drivers/s390/net/lcs.h
@@ -138,6 +138,7 @@ enum lcs_channel_states {
LCS_CH_STATE_RUNNING,
LCS_CH_STATE_SUSPENDED,
LCS_CH_STATE_CLEARED,
+ LCS_CH_STATE_ERROR,
};
/**
--
-
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