From 78eb9f73dddadf3ce458fe5d2c4f7a7d33161e7d Mon Sep 17 00:00:00 2001
From: ligd <liguiding@fishsemi.com>
Date: Wed, 8 Apr 2020 16:03:01 +0800
Subject: [PATCH] mm/mm_heap/mm_sem.c: add getpid() return check in
 mm_trysemaphore()

Change-Id: Ifd56e3ccc22cf0a50f52e643b7a87aab0d0dca06
Signed-off-by: ligd <liguiding@fishsemi.com>
---
 mm/mm_heap/mm_sem.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/mm_heap/mm_sem.c b/mm/mm_heap/mm_sem.c
index 2a324466501..0c34bf2436e 100644
--- a/mm/mm_heap/mm_sem.c
+++ b/mm/mm_heap/mm_sem.c
@@ -174,6 +174,11 @@ int mm_trysemaphore(FAR struct mm_heap_s *heap)
    * 'else', albeit with a nonsensical PID value.
    */
 
+  if (my_pid < 0)
+    {
+      return my_pid;
+    }
+
   /* Does the current task already hold the semaphore?  Is the current
    * task actually running?
    */