instances[idx].mode = COMPATIBILITY;
       instances[idx].run_length = 0;
       instances[idx].run_flag = 0;
-      if (!request_region(lpAddr,3, dev_name)) return;
+      if (!request_region(lpAddr,3, bpp_dev_name)) return;
 
       /*
        * First, make sure the instance exists. Do this by writing to
        if (rc == 0)
                return -ENODEV;
 
-       rc = register_chrdev(BPP_MAJOR, dev_name, &bpp_fops);
+       rc = register_chrdev(BPP_MAJOR, bpp_dev_name, &bpp_fops);
        if (rc < 0)
                return rc;
 
 {
        unsigned idx;
 
-       unregister_chrdev(BPP_MAJOR, dev_name);
+       unregister_chrdev(BPP_MAJOR, bpp_dev_name);
 
        for (idx = 0;  idx < BPP_NO; idx++) {
                if (instances[idx].present)