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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>