From 25c61a1fe8c97d1352a2dc0eda25128b3be0db27 Mon Sep 17 00:00:00 2001 From: Cornelia Huck <cornelia.huck@de.ibm.com> Date: Mon, 26 Mar 2007 20:42:41 +0200 Subject: [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> --- drivers/s390/cio/device_status.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c index 6b1caea..25d99bd 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. */ -- cgit v1.1