D47154.diff
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	diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
	--- a/sys/kern/subr_bus.c
	+++ b/sys/kern/subr_bus.c
	@@ -1477,11 +1477,14 @@

	PDEBUG(("%s from %s", DEVICENAME(child), DEVICENAME(dev)));

	- /* detach parent before deleting children, if any */
	+ /*
	+ * Detach child. Ideally this cleans up any grandchild
	+ * devices.
	+ */
	if ((error = device_detach(child)) != 0)
	return (error);

	- /* remove children second */
	+ /* Delete any grandchildren left after detach. */
	while ((grandchild = TAILQ_FIRST(&child->children)) != NULL) {
	error = device_delete_child(child, grandchild);
	if (error)