From 6f3b9933bd6d60c62862d384a5f3c448f74d3c41 Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Sun, 17 Apr 2016 18:11:04 +0300
Subject: [PATCH] esp8266/esp_mphal: Protect dupterm_task_handler() from
 recursive exec.

---
 esp8266/esp_mphal.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/esp8266/esp_mphal.c b/esp8266/esp_mphal.c
index 72c3b8b59b..914097f9b5 100644
--- a/esp8266/esp_mphal.c
+++ b/esp8266/esp_mphal.c
@@ -194,6 +194,11 @@ static int call_dupterm_read(void) {
 }
 
 STATIC void dupterm_task_handler(os_event_t *evt) {
+    static byte lock;
+    if (lock) {
+        return;
+    }
+    lock = 1;
     while (1) {
         int c = call_dupterm_read();
         if (c < 0) {
@@ -202,6 +207,7 @@ STATIC void dupterm_task_handler(os_event_t *evt) {
         ringbuf_put(&input_buf, c);
     }
     mp_hal_signal_input();
+    lock = 0;
 }
 
 STATIC os_event_t dupterm_evt_queue[4];