diff -pNaru5 perle-serial-3.9.2.orig-0006/pserial/perle-serial.c perle-serial-3.9.2/pserial/perle-serial.c
--- perle-serial-3.9.2.orig-0006/pserial/perle-serial.c	2021-11-20 16:06:52.656295643 -0500
+++ perle-serial-3.9.2/pserial/perle-serial.c	2021-11-20 16:08:20.147780960 -0500
@@ -4986,12 +4986,12 @@ static int __init ps_init(void)
 	{
 		panic("Couldn't register Perle's serial driver\n");
 	}
 
 #else	// At least 2.5.0 kernel.
-	serial_driver = alloc_tty_driver(NR_PORTS);
-	if (!serial_driver){
+	serial_driver = tty_alloc_driver(NR_PORTS,0);
+	if (IS_ERR(serial_driver)){
 		printk(KERN_ERR "Couldn't allocate Perle serial driver\n");
 		return -ENOMEM;
 	}
 	serial_driver->owner = THIS_MODULE;
 	serial_driver->driver_name = "perle-serial";
@@ -5006,11 +5006,11 @@ static int __init ps_init(void)
 	serial_driver->flags = TTY_DRIVER_REAL_RAW ;
 	
 	tty_set_operations(serial_driver, &ps_ops);
 	if( (rc = tty_register_driver(serial_driver)) < 0 )
 	{
-		put_tty_driver(serial_driver);
+		tty_driver_kref_put(serial_driver);
 		printk(KERN_ERR "Couldn't register Perle serial driver\n");
 		return rc;
 	}
 
 #endif
@@ -5226,11 +5226,11 @@ static void __exit ps_fini(void)
 #if LINUX_VERSION_CODE <  KERNEL_VERSION(2,5,0)
 	remove_bh( PERLE_SERIAL_BH );
 	tty_unregister_driver(&serial_driver);
 #else
 	tty_unregister_driver(serial_driver);
-	put_tty_driver(serial_driver);
+	tty_driver_kref_put(serial_driver);
 #endif
 	for (i = 0; i < NR_PORTS; i++) {
 		if ((info = ps_table[i].info)) {
 //			if (info->state->XRflatreg) // This code causes oops. Remove for now plus all other Sleep calls.
 //				ps_resetSLEEP(info);			/* reset sleep mode for Exar uarts */