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82e2756897
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: e34e47eb28c0 ("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>