From d88ae3cfd89f60a57af139de696f5f4f33e899fa Mon Sep 17 00:00:00 2001
From: rongli <rongli@nestlabs.com>
Date: Thu, 4 Aug 2016 09:23:51 +0800
Subject: [PATCH] fix sed issue - unable to reattach when the parent is removed
 (#326)

---
 src/core/thread/mesh_forwarder.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/core/thread/mesh_forwarder.cpp b/src/core/thread/mesh_forwarder.cpp
index c9a57a130..94ee8b029 100644
--- a/src/core/thread/mesh_forwarder.cpp
+++ b/src/core/thread/mesh_forwarder.cpp
@@ -957,6 +957,7 @@ void MeshForwarder::HandleSentFrame(Mac::Frame &aFrame)
 {
     Mac::Address macDest;
     Child *child;
+    Neighbor *neighbor;
 
     mSendBusy = false;
 
@@ -1004,6 +1005,17 @@ void MeshForwarder::HandleSentFrame(Mac::Frame &aFrame)
         }
     }
 
+    if (mSendMessage->GetType() == Message::kTypeMacDataPoll)
+    {
+        neighbor = mMle.GetParent();
+
+        if (neighbor->mState == Neighbor::kStateInvalid)
+        {
+            mPollTimer.Stop();
+            mMle.BecomeDetached();
+        }
+    }
+
     if (mSendMessage->GetDirectTransmission() == false && mSendMessage->IsChildPending() == false)
     {
         mSendQueue.Dequeue(*mSendMessage);