cdev_put          403 fs/char_dev.c  	cdev_put(new);
cdev_put          422 fs/char_dev.c  	cdev_put(p);
cdev_put          283 fs/file_table.c 		cdev_put(inode->i_cdev);
cdev_put           27 include/linux/cdev.h void cdev_put(struct cdev *p);