--- zzzz-none-000/linux-4.9.231/drivers/tty/n_tty.c	2020-07-22 07:10:54.000000000 +0000
+++ falcon-5590-729/linux-4.9.231/drivers/tty/n_tty.c	2022-03-30 12:03:35.000000000 +0000
@@ -2313,6 +2313,12 @@
 			return retval;
 	}
 
+	if (tty->driver->ops->avm_console_enabled) {
+		if (!tty->driver->ops->avm_console_enabled(tty)) {
+			return nr;
+		}
+	}
+
 	down_read(&tty->termios_rwsem);
 
 	/* Write out any echoed characters that are still pending */