--- zzzz-none-000/linux-3.10.107/drivers/tty/n_tty.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/drivers/tty/n_tty.c	2021-11-10 11:53:55.000000000 +0000
@@ -104,6 +104,10 @@
 	raw_spinlock_t read_lock;
 };
 
+#if defined(CONFIG_AVM_ENHANCED)
+unsigned int g_avm_console_open;
+#endif
+
 static inline int tty_put_user(struct tty_struct *tty, unsigned char x,
 			       unsigned char __user *ptr)
 {
@@ -1783,7 +1787,6 @@
  *
  *	This code must be sure never to sleep through a hangup.
  */
-
 static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 			 unsigned char __user *buf, size_t nr)
 {
@@ -2031,6 +2034,15 @@
 			return retval;
 	}
 
+#if defined(CONFIG_AVM_ENHANCED)
+    if (tty->driver->ops->is_avm_console) {
+        if (( ! g_avm_console_open) && tty->driver->ops->is_avm_console(tty)) {
+            b += nr;
+            goto skip_out;
+        }
+    }
+#endif
+
 	/* Write out any echoed characters that are still pending */
 	process_echoes(tty);
 
@@ -2093,6 +2105,9 @@
 break_out:
 	__set_current_state(TASK_RUNNING);
 	remove_wait_queue(&tty->write_wait, &wait);
+#if defined(CONFIG_AVM_ENHANCED)
+skip_out:
+#endif
 	if (b - buf != nr && tty->fasync)
 		set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 	return (b - buf) ? b - buf : retval;
@@ -2165,6 +2180,7 @@
 	struct n_tty_data *ldata = tty->disc_data;
 	int retval;
 
+
 	switch (cmd) {
 	case TIOCOUTQ:
 		return put_user(tty_chars_in_buffer(tty), (int __user *) arg);
@@ -2210,3 +2226,18 @@
 	ops->refcount = ops->flags = 0;
 }
 EXPORT_SYMBOL_GPL(n_tty_inherit_ops);
+
+/*------------------------------------------------------------------------------------------*\
+ * keine Ausgaben auf der Console ohne g_avm_console_open=1
+ * n_tty_read schaltet die Ausgaben auf der Console wieder frei
+ * beim Kunden wird kein Read auf der Console erfolgen, also gibt es auch keine Ausgaben
+\*------------------------------------------------------------------------------------------*/
+#if defined(CONFIG_AVM_ENHANCED)
+static int setup_debug_console(char *p) {
+    g_avm_console_open = 1;
+    return 0;
+}
+__setup("debug_console", setup_debug_console);
+#endif
+
+