Otherwise the call to event_notifier_set() is a nop, which causes
the SLOF firmware on POWER to hang when booting from a virtio-scsi
device:
virtio_scsi_dataplane_start()
virtio_scsi_vring_init()
virtio_bus_set_host_notifier() <- assign == true
event_notifier_init() <- active == 1
event_notifier_set() <- fails right away if !e->initialized
Fixes: e34e47eb28 ("event_notifier: handle initialization failure better")
Cc: mlevitsk@redhat.com
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20210216120247.1293569-1-groug@kaod.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>