tree e95e17c270b88565bc3d91a5d4ac6abf7127399d
parent 1f08be80bef6f7a3faaa728db836b47ff742f41f
author Sebastian Ott <sebott@linux.vnet.ibm.com> 1346847582 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1346920839 +0200

s390/cio: fix IO subchannel event race

If the subchannel event function is called from IRQ context and we
observe that the subchannel in question is gone we flag the attached
device as not operational and schedule the event function to be called
again from process context where the subchannel gets deregistered.
However if the subchannel reappeared at the time the event function
gets called from process context we would do nothing and leave the
device in not operational state. Recognize this case in sch_get_action
and trigger reexamination of the subchannel/device.

Acked-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>