Hi All,
The scull code which is a sample char driver has some code snippets in
the 3rd chapter.
Under section 3.4.1 Device Registration in scull we have following
code snippet -
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);
dev->cdev.owner = THIS_MODULE;
dev->cdev.ops = &scull_fops;
err = cdev_add (&dev->cdev, devno, 1);
/* Fail gracefully if need be */
if (err)
printk(KERN_NOTICE "Error %d adding scull%d", err, index);
}
My doubt is
though we have used cdev_init(&dev->cdev, &scull_fops) to initiaize
the fops structure for our embedded cdev, why are we again setting the
dev->cdev.ops explicity again using
dev->cdev.ops = &scull_fops;
Isn't cdev_init() supposed to do the initialisation?
What am i missing here?
Thank you
~psr
--
play the game
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