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authorCornelia Huck <cornelia.huck@de.ibm.com>2007-03-26 20:42:41 +0200
committerHeiko Carstens <heiko.carstens@de.ibm.com>2007-03-26 20:43:47 +0200
commit25c61a1fe8c97d1352a2dc0eda25128b3be0db27 (patch)
tree8ad3f9453ded87b546ef5bd2fce2ee38bd0e5f75
parentb70842df77615309d76bcdd63bd289993e0844f2 (diff)
[S390] cio: Device status validity.
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>
-rw-r--r--drivers/s390/cio/device_status.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c
index 6b1caea622e..25d99bd2808 100644
--- a/drivers/s390/cio/device_status.c
+++ b/drivers/s390/cio/device_status.c
@@ -263,7 +263,11 @@ ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
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. */