diff -pNaru5 driver/2.6.27.orig/dgrp_tty.c driver/2.6.27/dgrp_tty.c
--- driver/2.6.27.orig/dgrp_tty.c	2021-11-20 14:56:04.993491404 -0500
+++ driver/2.6.27/dgrp_tty.c	2021-11-20 14:57:49.520506448 -0500
@@ -4105,11 +4105,11 @@ dgrp_tty_uninit(struct nd_struct *nd)
 
 		if (nd->nd_serial_ttdriver->ttys) {
 			kfree(nd->nd_serial_ttdriver->ttys);
 			nd->nd_serial_ttdriver->ttys = NULL;
 		}
-		put_tty_driver(nd->nd_serial_ttdriver);
+		tty_driver_kref_put(nd->nd_serial_ttdriver);
 		nd->nd_ttdriver_flags &= ~SERIAL_TTDRV_REG;
 	}
 
 	if (nd->nd_ttdriver_flags & CALLOUT_TTDRV_REG) {
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
@@ -4121,11 +4121,11 @@ dgrp_tty_uninit(struct nd_struct *nd)
 
 		if (nd->nd_callout_ttdriver->ttys) {
 			kfree(nd->nd_callout_ttdriver->ttys);
 			nd->nd_callout_ttdriver->ttys = NULL;
 		}
-		put_tty_driver(nd->nd_callout_ttdriver);
+		tty_driver_kref_put(nd->nd_callout_ttdriver);
 		nd->nd_ttdriver_flags &= ~CALLOUT_TTDRV_REG;
 	}
 
 	if (nd->nd_ttdriver_flags & XPRINT_TTDRV_REG) {
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
@@ -4137,11 +4137,11 @@ dgrp_tty_uninit(struct nd_struct *nd)
 
 		if (nd->nd_xprint_ttdriver->ttys) {
 			kfree(nd->nd_xprint_ttdriver->ttys);
 			nd->nd_xprint_ttdriver->ttys = NULL;
 		}
-		put_tty_driver(nd->nd_xprint_ttdriver);
+		tty_driver_kref_put(nd->nd_xprint_ttdriver);
 		nd->nd_ttdriver_flags &= ~XPRINT_TTDRV_REG;
 	}
 
 	dbg_tty_trace(UNINIT, ("tty uninit: done\n"));
 }
@@ -4163,11 +4163,11 @@ dgrp_tty_init(struct nd_struct *nd)
 
 	/*
 	 *  Initialize the TTDRIVER structures.
 	 */
 
-	nd->nd_serial_ttdriver = alloc_tty_driver(CHAN_MAX);
+	nd->nd_serial_ttdriver = tty_alloc_driver(CHAN_MAX,0);
 	sprintf(nd->nd_serial_name,  "tty_dgrp_%s_", id);
 
 	nd->nd_serial_ttdriver->owner        = THIS_MODULE;
 	nd->nd_serial_ttdriver->name         = nd->nd_serial_name;
 	nd->nd_serial_ttdriver->name_base    = 0;
@@ -4227,11 +4227,11 @@ dgrp_tty_init(struct nd_struct *nd)
 			}
 		}
 		nd->nd_ttdriver_flags |= SERIAL_TTDRV_REG;
 	}
 
-	nd->nd_callout_ttdriver = alloc_tty_driver(CHAN_MAX);
+	nd->nd_callout_ttdriver = tty_alloc_driver(CHAN_MAX,0);
 	sprintf(nd->nd_callout_name, "cu_dgrp_%s_",  id);
 
 	nd->nd_callout_ttdriver->owner        = THIS_MODULE;
 	nd->nd_callout_ttdriver->name         = nd->nd_callout_name;
 	nd->nd_callout_ttdriver->name_base    = 0;
@@ -4268,11 +4268,11 @@ dgrp_tty_init(struct nd_struct *nd)
 			nd->nd_ttdriver_flags |= CALLOUT_TTDRV_REG;
 		}
 	}
 
 
-	nd->nd_xprint_ttdriver = alloc_tty_driver(CHAN_MAX);
+	nd->nd_xprint_ttdriver = tty_alloc_driver(CHAN_MAX,0);
 	sprintf(nd->nd_xprint_name,  "pr_dgrp_%s_", id);
 
 	nd->nd_xprint_ttdriver->owner         = THIS_MODULE;
 	nd->nd_xprint_ttdriver->name          = nd->nd_xprint_name;
 	nd->nd_xprint_ttdriver->name_base     = 0;