AOE_MAJOR
gd->major = AOE_MAJOR;
n = register_chrdev(AOE_MAJOR, "aoechr", &aoe_fops);
unregister_chrdev(AOE_MAJOR, "aoechr");
MKDEV(AOE_MAJOR, chardevs[i].minor), NULL,
device_destroy(&aoe_class, MKDEV(AOE_MAJOR, chardevs[i].minor));
unregister_chrdev(AOE_MAJOR, "aoechr");
unregister_blkdev(AOE_MAJOR, DEVICE_NAME);
ret = register_blkdev(AOE_MAJOR, DEVICE_NAME);