[S390] cio: Only register ccw_device for registered subchannel.

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There is a race between io_subchannel_register() and
io_subchannel_sch_event() which may cause a subchannel to be
unregistered because it is no longer operational before
io_subchannel_register() had run. We need to check whether the
subchannel is still registered before the ccw device can be
registered and just bail out if it is not.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Cornelia Huck 2008-12-25 13:39:08 +01:00 • committed by Martin Schwidefsky

parent 6eff208f47

commit 5fb6b8544d

1 changed files with 12 additions and 6 deletions

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18

drivers/s390/cio/device.c

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