--- zzzz-none-000/linux-3.10.107/drivers/s390/char/tty3270.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/s390/char/tty3270.c	2021-02-04 17:41:59.000000000 +0000
@@ -125,10 +125,7 @@
  */
 static void tty3270_set_timer(struct tty3270 *tp, int expires)
 {
-	if (expires == 0)
-		del_timer(&tp->timer);
-	else
-		mod_timer(&tp->timer, jiffies + expires);
+	mod_timer(&tp->timer, jiffies + expires);
 }
 
 /*
@@ -662,6 +659,10 @@
 		else
 			/* Normal end. Copy residual count. */
 			rq->rescnt = irb->scsw.cmd.count;
+	} else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
+		/* Interrupt without an outstanding request -> update all */
+		tp->update_flags = TTY_UPDATE_ALL;
+		tty3270_set_timer(tp, 1);
 	}
 	return RAW3270_IO_DONE;
 }
@@ -744,7 +745,6 @@
 {
 	int pages;
 
-	del_timer_sync(&tp->timer);
 	kbd_free(tp->kbd);
 	raw3270_request_free(tp->kreset);
 	raw3270_request_free(tp->read);
@@ -810,7 +810,7 @@
 	struct winsize ws;
 
 	screen = tty3270_alloc_screen(tp->n_rows, tp->n_cols);
-	if (!screen)
+	if (IS_ERR(screen))
 		return;
 	/* Switch to new output size */
 	spin_lock_bh(&tp->view.lock);
@@ -877,6 +877,7 @@
 {
 	struct tty3270 *tp = container_of(view, struct tty3270, view);
 
+	del_timer_sync(&tp->timer);
 	tty3270_free_screen(tp->screen, tp->view.rows);
 	tty3270_free_view(tp);
 }
@@ -1845,17 +1846,17 @@
 	.set_termios = tty3270_set_termios
 };
 
-void tty3270_create_cb(int minor)
+static void tty3270_create_cb(int minor)
 {
 	tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
 }
 
-void tty3270_destroy_cb(int minor)
+static void tty3270_destroy_cb(int minor)
 {
 	tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR);
 }
 
-struct raw3270_notifier tty3270_notifier =
+static struct raw3270_notifier tty3270_notifier =
 {
 	.create = tty3270_create_cb,
 	.destroy = tty3270_destroy_cb,