Function devclass_quiesce_driver

freebsd/kern/subr_bus.c:1306–1356

* @brief Quiesces a set of device drivers from a device class * * Quiesce a device driver from a devclass. This is normally called * automatically by DRIVER_MODULE(). * * If the driver is currently attached to any devices, * devclass_quiesece_driver() will first attempt to quiesce each * device. * * @param dc the devclass to edit * @param driver the driver to unregister */

 * @param driver	the driver to unregister
 */
static int
devclass_quiesce_driver(devclass_t busclass, driver_t *driver)
{
	devclass_t dc = devclass_find(driver->name);
	driverlink_t dl;
	device_t dev;
	int i;
	int error;

	PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass)));

	if (!dc)
		return (0);

	/*
	 * Find the link structure in the bus' list of drivers.
	 */
	TAILQ_FOREACH(dl, &busclass->drivers, link) {
		if (dl->driver == driver)
			break;
	}

	if (!dl) {
		PDEBUG(("%s not found in %s list", driver->name,
		    busclass->name));
		return (ENOENT);
	}

	/*
	 * Quiesce all devices.  We iterate through all the devices in
	 * the devclass of the driver and quiesce any which are using
	 * the driver and which have a parent in the devclass which we
	 * are quiescing.
	 *
	 * Note that since a driver can be in multiple devclasses, we
	 * should not quiesce devices which are not children of
	 * devices in the affected devclass.
	 */
	for (i = 0; i < dc->maxunit; i++) {
		if (dc->devices[i]) {
			dev = dc->devices[i];
			if (dev->driver == driver && dev->parent &&
			    dev->parent->devclass == busclass) {
				if ((error = device_quiesce(dev)) != 0)
					return (error);
			}
		}
	}

	return (0);
}

/**
 * @internal