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Subject[patch 4/6] cio: Device status validity.
From: Cornelia Huck <cornelia.huck@de.ibm.com>

Only accumulate device status field in irb if it is valid.

Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---

drivers/s390/cio/device_status.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/s390/cio/device_status.c
===================================================================
--- linux-2.6.orig/drivers/s390/cio/device_status.c
+++ linux-2.6/drivers/s390/cio/device_status.c
@@ -263,7 +263,11 @@ ccw_device_accumulate_irb(struct ccw_dev
cdev_irb->scsw.cpa = irb->scsw.cpa;
/* Accumulate device status, but not the device busy flag. */
cdev_irb->scsw.dstat &= ~DEV_STAT_BUSY;
- cdev_irb->scsw.dstat |= irb->scsw.dstat;
+ /* dstat is not always valid. */
+ if (irb->scsw.stctl &
+ (SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS
+ | SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS))
+ cdev_irb->scsw.dstat |= irb->scsw.dstat;
/* Accumulate subchannel status. */
cdev_irb->scsw.cstat |= irb->scsw.cstat;
/* Copy residual count if it is valid. */
--
-
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