From 9800750f15c950d05ed874623adbc91054159a29 Mon Sep 17 00:00:00 2001
From: Felipe Neves <felipe.neves@espressif.com>
Date: Tue, 7 Jan 2020 10:46:59 -0300
Subject: [PATCH] freertos/port: Put critical sections around
 uxPortCompareSetExtram() to prevent preemption during its execution.

Closes: https://github.com/espressif/esp-idf/issues/4561
---
 components/freertos/port.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/components/freertos/port.c b/components/freertos/port.c
index bab93aad5a..3088fae45d 100644
--- a/components/freertos/port.c
+++ b/components/freertos/port.c
@@ -443,6 +443,9 @@ static portMUX_TYPE extram_mux = portMUX_INITIALIZER_UNLOCKED;
 
 void uxPortCompareSetExtram(volatile uint32_t *addr, uint32_t compare, uint32_t *set) {
 	uint32_t prev;
+
+	uint32_t oldlevel = portENTER_CRITICAL_NESTED();
+
 #ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
 	vPortCPUAcquireMutexIntsDisabled(&extram_mux, portMUX_NO_TIMEOUT, __FUNCTION__, __LINE__);
 #else
@@ -458,6 +461,8 @@ void uxPortCompareSetExtram(volatile uint32_t *addr, uint32_t compare, uint32_t
 #else
 	vPortCPUReleaseMutexIntsDisabled(&extram_mux);
 #endif
+
+	portEXIT_CRITICAL_NESTED(oldlevel);
 }
 #endif //defined(CONFIG_SPIRAM)