Function device_quiesce

freebsd/kern/subr_bus.c:3052–3062

* @brief Tells a driver to quiesce itself. * * This function is a wrapper around the DEVICE_QUIESCE() driver * method. If the call to DEVICE_QUIESCE() succeeds. * * @param dev the device to quiesce * * @retval 0 success * @retval ENXIO no driver was found * @retval ENOMEM memory allocation failure * @retval non-zero some other unix error code */

 * @retval non-zero	some other unix error code
 */
int
device_quiesce(device_t dev)
{
	PDEBUG(("%s", DEVICENAME(dev)));
	if (dev->state == DS_BUSY)
		return (EBUSY);
	if (dev->state != DS_ATTACHED)
		return (0);

	return (DEVICE_QUIESCE(dev));
}

/**
 * @brief Notify a device of system shutdown