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[S390] lost interrupt after chpid vary off/on cycle.

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I/O on a CCW device may stall if a channel path to that device is
logicaly varied off/on. A user I/O interrupt can get misinterpreted
as interrupt for an internal path verification operation due to a
missing check and is therefore never reported to the device driver.

Correct check for pending interruptions before starting path
verification.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter 2006-08-07 17:00:33 +02:00 committed by Martin Schwidefsky
parent 4bc0c4f9e7
commit 65200c291c
1 changed files with 1 additions and 0 deletions
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drivers/s390/cio/device_fsm.c
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@ -772,6 +772,7 @@ ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
stsch(sch->schid, &sch->schib);
if (sch->schib.scsw.actl != 0 ||
(sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
(cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
/*
* No final status yet or final status not yet delivered