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026499a9c2
commit70fac8088cupstream. Tests with kvm and a kmemdebug kernel showed, that on hot unplug the zcard and zqueue structs for the unplugged card or queue are not properly freed because of a mismatch with get/put for the embedded kref counter. This fix now adjusts the handling of the kref counters. With init the kref counter starts with 1. This initial value needs to drop to zero with the unregister of the card or queue to trigger the release and free the object. Fixes:29c2680fd2("s390/ap: fix ap devices reference counting") Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com> Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Cc: stable@vger.kernel.org Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>