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| author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2007-03-26 20:42:41 +0200 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2007-03-26 20:43:47 +0200 |
| commit | 25c61a1fe8c97d1352a2dc0eda25128b3be0db27 (patch) | |
| tree | 8ad3f9453ded87b546ef5bd2fce2ee38bd0e5f75 /drivers/s390/cio/device_status.c | |
| parent | [S390] kprobes: Align probe address. (diff) | |
| download | linux-25c61a1fe8c97d1352a2dc0eda25128b3be0db27.tar.xz linux-25c61a1fe8c97d1352a2dc0eda25128b3be0db27.zip | |
[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>
Diffstat (limited to 'drivers/s390/cio/device_status.c')
| -rw-r--r-- | drivers/s390/cio/device_status.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c index 6b1caea622ea..25d99bd28089 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. */ |