--- nslink.c.orig	2021-09-12 22:30:11.942180898 -0400
+++ nslink.c	2021-09-12 22:30:37.085578537 -0400
@@ -1401,11 +1401,17 @@ retry:
 
                         /*
                          * Transmit characters in our transmit buffer
                          */
                         if (info->x_char ||
-                            (info->xmit_cnt && info->tty && !info->tty->hw_stopped && !info->tty->stopped)) {
+                            (info->xmit_cnt && info->tty && !info->tty->hw_stopped && !
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,14,0)
+                             info->tty->flow.stopped
+#else
+                             info->tty->stopped
+#endif
+                            )) {
                                 if (!hdlc_xmit(si, skb, info, pstate))
                                         send_packet = 1;
                         }
                 } else if (info->remote_status == REM_OPEN_PORT) {
                         if (hdlc_1byte_cmd(si, skb, i, RK_REMOTE_STATUS, REM_OPEN_PORT)) {
@@ -3484,11 +3490,17 @@ static void nrp_start(struct tty_struct
         /*
          * Start the transmitter remotely, if we ever add a stop
          * transmitter to nrp_stop.
          */
 
-        if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+        if (info->xmit_cnt <= 0 || 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,14,0)
+            tty->flow.stopped
+#else
+            tty->stopped
+#endif
+            || tty->hw_stopped ||
             !info->xmit_buf)
                 return;
 
         info->si->need_to_send = 1;
         if (info->si->use_tcp == 0)
@@ -3692,11 +3704,16 @@ static void nrp_flush_chars(struct tty_s
         pstate = &info->si->port_state[info->portnum];
         if (pstate)
                 space = get_tx_space_remote(pstate);
 
         if (space <= WAKEUP_CHARS || info->xmit_cnt <= 0 ||
-            tty->stopped || tty->hw_stopped || !info->xmit_buf)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,14,0)
+            tty->flow.stopped
+#else
+            tty->stopped
+#endif
+            || tty->hw_stopped || !info->xmit_buf)
                 return;
 
         info->si->need_to_send = 1;
         if (info->si->use_tcp == 0) {
                 if (info->xmit_cnt > 64)
@@ -3813,11 +3830,15 @@ end:
 /*
  * Return the number of characters that can be sent.  We estimate
  * only using the in-memory transmit buffer only, and ignore the
  * potential space in the remote end.
  */
+#if LINUX_VERSION_CODE >= VERSION_CODE(5,14,0)
+static unsigned int nrp_write_room(struct tty_struct *tty)
+#else
 static int nrp_write_room(struct tty_struct *tty)
+#endif
 {
         struct nr_port *info = (struct nr_port *) tty->driver_data;
         int ret;
 
         if (nslink_paranoia_check(info, "nrp_write_room"))
@@ -3834,11 +3855,15 @@ static int nrp_write_room(struct tty_str
 
 /*
  * Return the number of characters in the buffer.  Again, this only
  * counts those characters in the in-memory transmit buffer.
  */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,14,0)
+static unsigned int nrp_chars_in_buffer(struct tty_struct *tty)
+#else
 static int nrp_chars_in_buffer(struct tty_struct *tty)
+#endif
 {
         struct nr_port *info = (struct nr_port *) tty->driver_data;
 
         if (nslink_paranoia_check(info, "nrp_chars_in_buffer"))
                 return 0;
@@ -4617,11 +4642,17 @@ static void tcp_send_remote_cmds(struct
                                 info->update_action = 0;
                                 info->action_register = 0;
                         }
                         if (info->x_char ||
                             (info->xmit_cnt && info->tty &&
-                             !info->tty->hw_stopped && !info->tty->stopped)) {
+                             !info->tty->hw_stopped && 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,14,0)
+                             !info->tty->flow.stopped
+#else
+                             !info->tty->stopped
+#endif
+                            )) {
                                 if (tcp_room(si, bi, 4)) {
                                         bi = 0;
                                         continue;
                                 }
                                 dc = tcp_out_data(buf, bi, info, pstate, si);