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[S390] cio: Fix handling of interrupt for csch().

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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>
This commit is contained in:
Cornelia Huck 2007-04-04 14:37:11 +02:00 committed by Martin Schwidefsky
parent 6e1beb3c22
commit 8c3ce5bece
1 changed files with 8 additions and 0 deletions
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8
drivers/s390/cio/device_status.c
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@ -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. */