FreeBSD/sys/kern/subr_bus.c
/*
 * If we get here, assume that the device is permanent and really is
 * present in the system.  Removable bus drivers are expected to intercept
 * this call long before it gets here.  We return -1 so that drivers that
 * really care can check vs -1 or some ERRNO returned higher in the food
 * chain.
 */
If we get here, assume that the device is permanent and really is
present in the system.  Removable bus drivers are expected to intercept
this call long before it gets here.  We return -1 so that drivers that
really care can check vs -1 or some ERRNO returned higher in the food
chain.
If we get here assume that the device is permanent and really is present in the system . Removable bus drivers are expected to intercept this call long before it gets here . We return - 1 so that drivers that really care can check vs - 1 or some ERRNO returned higher in the food chain .
static int
root_child_present(device_t dev, device_t child)
{
	return (-1);
}
static int root_child_present ( device_t dev , device_t child ) { return ( -1 ) ; }
If we get here, assume that the device is permanent and really is
 present in the system.
If we get here assume that the device is permanent and really is present in the system .