Copyright (c) 2016 John H. Baldwin <jhb@FreeBSD.org>
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(The comments found at the beginning of the groff file "man9/BUS_RESCAN.9freebsd".)
- rescan a bus checking for devices that have been added or removed
Fn BUS_RESCAN device_t dev
method is called to request a rescan of the child devices on a bus device.
The method should add any devices that have been added since the previous
scan and remove devices that have been removed.
This method is not required to re-examine existing devices to determine if
their properties have changed.
This method is also not required to propagate the rescan request to child