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[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>
This commit is contained in:
Cornelia Huck 2007-03-26 20:42:41 +02:00 committed by Heiko Carstens
parent b70842df77
commit 25c61a1fe8
1 changed files with 5 additions and 1 deletions
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6
drivers/s390/cio/device_status.c
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@ -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. */