Function devclass_delete_driver

freebsd/kern/subr_bus.c:1251–1291

* @brief Delete a device driver from a device class * * Delete a device driver from a devclass. This is normally called * automatically by DRIVER_MODULE(). * * If the driver is currently attached to any devices, * devclass_delete_driver() will first attempt to detach from each * device. If one of the detach calls fails, the driver will not be * deleted. * * @param dc the devclass to edi

 * @param driver	the driver to unregister
 */
int
devclass_delete_driver(devclass_t busclass, driver_t *driver)
{
	devclass_t dc = devclass_find(driver->name);
	driverlink_t dl;
	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);
	}

	error = devclass_driver_deleted(busclass, dc, driver);
	if (error != 0)
		return (error);

	TAILQ_REMOVE(&busclass->drivers, dl, link);
	free(dl, M_BUS);

	/* XXX: kobj_mtx */
	driver->refs--;
	if (driver->refs == 0)
		kobj_class_free((kobj_class_t) driver);

	bus_data_generation_update();
	return (0);
}

/**
 * @brief Quiesces a set of device drivers from a device class