【整理】Linux驱动中，probe函数何时被调用

声明：以下主要内容参考自：关于struct device_driver结构中的probe探测函数的调用http://blog.chinaunix.net/u2/71164/showart.php?id=1361188用SourceInsight跟踪：从driver_register看起，此处我的这里是：int driver_register(struct device_driver * drv){if ((drv->bus->probe && drv->probe) ||     (drv->bus->remove && drv->remove) ||     (drv->bus->shutdown && drv->shutdown)) {   printk(KERN_WARNING "Driver '%s' needs updating - please use bus_type methods\n", drv->name);}klist_init(&drv->klist_devices, NULL, NULL);return bus_add_driver(drv);}klist_init不相关，不用管他，具体再去看bus_add_driver：int bus_add_driver(struct device_driver *drv){1.先kobject_set_name(&drv->kobj, "%s", drv->name);2.再kobject_register(&drv->kobj)3.然后调用了：driver_attach(drv)}int driver_attach(struct device_driver * drv){return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach);}真正起作用的是__driver_attach：static int __driver_attach(struct device * dev, void * data){。。。if (!dev->driver)   driver_probe_device(drv, dev);。。。}int driver_probe_device(struct device_driver * drv, struct device * dev){。。。//1.先是判断bus是否match：if (drv->bus->match && !drv->bus->match(dev, drv))   goto done;//2.再具体执行probe：ret = really_probe(dev, drv);。。。}really_probe才是我们要找的函数：static int really_probe(struct device *dev, struct device_driver *drv){。。。//1.先是调用的驱动所属总线的probe函数：if (dev->bus->probe) {   ret = dev->bus->probe(dev);   if (ret)    goto probe_failed;} else if (drv->probe) {//2.再调用你的驱动中的probe函数：   ret = drv->probe(dev);   if (ret)    goto probe_failed;}。。。}其中，drv->probe(dev)，才是真正调用你的驱动实现的具体的probe函数。也就是对应此文标题所问的，probe函数此时被调用。