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[S390] qdio: prevent call trace if CHPID is offline

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If a CHPID is offline during a device shutdown the ccw_device_halt|clear
may fail and the qdio device stays in state STOPPED until the shutdown is
finished. If an interrupt occurs before the device is set to INACTIVE
the STOPPED state triggers a WARN_ON in the interrupt handler.
Prevent this WARN_ON by catching the STOPPED state in the interrupt
handler.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Jan Glauber 2010-02-09 09:46:08 +01:00 committed by Martin Schwidefsky
parent 4c52228d1b
commit 959153d345
1 changed files with 2 additions and 0 deletions
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2
drivers/s390/cio/qdio_main.c
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@ -960,6 +960,8 @@ void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
qdio_handle_activate_check(cdev, intparm, cstat,
dstat);
break;
case QDIO_IRQ_STATE_STOPPED:
break;
default:
WARN_ON(1);
}