Trouble removing character device

[Kai Meyer]

I can't seem to get my character device to remove itself from the 
/proc/devices list. I'm calling all of the following functions like so:

alloc_chrdev_region(&dev, 0, 5, "my_char");
cdev_init(&my_cdev, &my_ops);
cdev_add(&my_cdev, MKDEV(my_major, my_minor), 1);
cdev_del(&my_cdev);
unregister_chrdev_region(my_major, 5);

It seems like I'm missing something, but I can't find it. I'm 
referencing the Linux Device Drivers v3, chapter 3. In the example code, 
the scull_cleanup_module function calls cdev_dell and 
unregister_chrdev_region, just like I do.

To be clear, after I unload my module (after calling cdev_del and 
unregister_chrdev_region), my "my_char" string still shows up in 
/proc/devices.

-Kai Meyer