Sensors are run as callbacks inside tasks. During suspend a sensor

Sensors are run as callbacks inside tasks.  During suspend a sensor
could be running inside a driver that will be force-detached, or due
to tsleep end up disrupting the softstate/hardstate contract.  At
suspend time, quisce all these callbacks by waiting for completion.
This issue has never been observed for real, but may be implicated in
suspend/resume failures.
ok kettenis guenther mlarkin