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| author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2007-04-04 16:37:11 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-04-04 16:37:39 +0400 |
| commit | 8c3ce5bece2e6e233c1d05b460883046d020fbf9 (patch) | |
| tree | 585029efcfa3d8b890ac194ae36b638e8abb1df2 /drivers/s390/cio/device_status.c | |
| parent | 6e1beb3c22496f6e1f1feba8ae74da16f131684c (diff) | |
| download | linux-8c3ce5bece2e6e233c1d05b460883046d020fbf9.tar.xz | |
[S390] cio: Fix handling of interrupt for csch().
Wipe internal irb if the clear function bit is set before accumulating
bits from the irb in order to follow hardware behaviour.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/device_status.c')
| -rw-r--r-- | drivers/s390/cio/device_status.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c index 25d99bd28089..aa96e6752592 100644 --- a/drivers/s390/cio/device_status.c +++ b/drivers/s390/cio/device_status.c @@ -221,6 +221,14 @@ ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb) cdev_irb = &cdev->private->irb; + /* + * If the clear function had been performed, all formerly pending + * status at the subchannel has been cleared and we must not pass + * intermediate accumulated status to the device driver. + */ + if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) + memset(&cdev->private->irb, 0, sizeof(struct irb)); + /* Copy bits which are valid only for the start function. */ if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) { /* Copy key. */ |