關(guān)于lkm里初始化一個字符設(shè)備的問題

picobsd

以下代碼取自ldd3一書的example，scull
我的問題就是，既然已經(jīng) cdev_init(&dev->cdev, &scull_fops); 連接了scull_fops到cdev,還有必要再調(diào)用 dev->cdev.ops = &scull_fops;來設(shè)置這個成員么？

static void scull_setup_cdev(struct scull_dev *dev, int index)
{
        int err, devno = MKDEV(scull_major, scull_minor + index);

        cdev_init(&dev->cdev, &scull_fops); // line 1
        dev->cdev.owner = THIS_MODULE;
        dev->cdev.ops = &scull_fops;  //基于line1 這個是不是多余的呢
        err = cdev_add (&dev->cdev, devno, 1);

}

lengyuex

void cdev_init(struct cdev *cdev, const struct file_operations *fops)
{
        memset(cdev, 0, sizeof *cdev);
        INIT_LIST_HEAD(&cdev->list);
        kobject_init(&cdev->kobj, &ktype_cdev_default);
        cdev->ops = fops;
}

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