From: Cornelia Huck Only accumulate device status field in irb if it is valid. Cc: Martin Schwidefsky Signed-off-by: Cornelia Huck Signed-off-by: Heiko Carstens --- 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. */ -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/