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authorKlaus D. Wacker <kdwacker@de.ibm.com>2007-10-05 16:45:47 +0200
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:54:41 -0700
commit59579da329b22bcddc5da0c22c61d6dc1f9eb96a (patch)
tree117eb93c9d50643a633018481ed68fc84063519d /drivers/s390
parentd8fae9c2f2642ffe411424ed2e4677f959168152 (diff)
downloadop-kernel-dev-59579da329b22bcddc5da0c22c61d6dc1f9eb96a.zip
op-kernel-dev-59579da329b22bcddc5da0c22c61d6dc1f9eb96a.tar.gz
lcs: Channel errors drive lcs_recovery which leads to kernel panic.
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@de.ibm.com> Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/net/lcs.c11
-rw-r--r--drivers/s390/net/lcs.h1
2 files changed, 9 insertions, 3 deletions
diff --git a/drivers/s390/net/lcs.c b/drivers/s390/net/lcs.c
index e4b11af..0fd663b 100644
--- a/drivers/s390/net/lcs.c
+++ b/drivers/s390/net/lcs.c
@@ -1400,11 +1400,14 @@ lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
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);
diff --git a/drivers/s390/net/lcs.h b/drivers/s390/net/lcs.h
index 0e1e4a0..8976fb0 100644
--- a/drivers/s390/net/lcs.h
+++ b/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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