--- nslink.c.orig	2021-11-20 15:13:52.248938958 -0500
+++ nslink.c	2021-11-20 15:15:42.252800968 -0500
@@ -5634,11 +5634,11 @@ int register_tty_driver(tBoxPortCount *u
 
         numBoxes = bp.boxCount;
 
         // Set up the tty driver structure and then register this
         // driver with the tty layer.
-        nslink_driver = alloc_tty_driver((MAX_NRP_TOTAL_PORTS - 1));
+        nslink_driver = tty_alloc_driver((MAX_NRP_TOTAL_PORTS - 1),0);
 
         nslink_driver->magic = TTY_DRIVER_MAGIC;
         nslink_driver->driver_name = "NS-Link";
         nslink_driver->name = "ttySI";
         nslink_driver->num = bp.portCount;
@@ -5661,11 +5661,11 @@ int register_tty_driver(tBoxPortCount *u
         nslink_driver->owner = THIS_MODULE;
         tty_set_operations(nslink_driver, &nslink_ops);
         retval = tty_register_driver(nslink_driver);
         if (retval < 0) {
                 printk(KERN_INFO "Couldn't install tty NS-Link driver (error %d)\n", -retval);
-                put_tty_driver(nslink_driver);
+                tty_driver_kref_put(nslink_driver);
                 return retval;
         }
         driver_registered = 1;
         printk(KERN_INFO "NS-Link driver is major %d\n", nslink_driver->major);
         return 0;
@@ -5737,11 +5737,11 @@ static void nrp_cleanup_module(void)
         for (i = 0; i < numBoxes; i++)
                 free_si_box(i);
 
         if (driver_registered) {
                 tty_unregister_driver(nslink_driver);
-                put_tty_driver(nslink_driver);
+                tty_driver_kref_put(nslink_driver);
         }
 
 	printk(KERN_INFO "nslink: finished driver module shutdown\n");
         return;
 }