272/**
273 * driver_attach - try to bind driver to devices.
274 * @drv: driver.
275 *
276 * Walk the list of devices that the bus has on it and try to
277 * match the driver with each one. If driver_probe_device()
278 * returns 0 and the @dev->driver is set, we\'ve found a
279 * compatible pair.
280 */
281int driver_attach(struct device_driver *drv)
282{
283 return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach);
284}
285EXPORT_SYMBOL_GPL(driver_attach);
扫描该总线上的每一个设备，将当前driver和总线上的设备进行match，如果匹配成功，则将设备和driver绑定起来。