From a59dd96bdc825ec497c128421c61c7a2aa7d9506 Mon Sep 17 00:00:00 2001
From: "amit.vikas.warbhe" <amit.vikas.warbhe@accenture.com>
Date: Thu, 5 Mar 2026 18:20:43 +0530
Subject: [PATCH] Fix Tap interface restart failure during lifecycle transition
 on POSIX

During lifecycle transition from LC1 to LC9 the Tap Ethernet driver failed to start on
POSIX platform. The failure occurred because the stop call for the driver was missing
and Tap file descriptor was not closed.
Also refactored TapEthernetDriver::start() to avoid double initialization.
---
 .../main/src/systems/TapEthernetSystem.cpp    |  1 +
 .../src/TapEthernetDriver.cpp                 | 24 ++++++++++++++++---
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/executables/referenceApp/platforms/posix/main/src/systems/TapEthernetSystem.cpp b/executables/referenceApp/platforms/posix/main/src/systems/TapEthernetSystem.cpp
index 163a88353ca..c2054025fab 100644
--- a/executables/referenceApp/platforms/posix/main/src/systems/TapEthernetSystem.cpp
+++ b/executables/referenceApp/platforms/posix/main/src/systems/TapEthernetSystem.cpp
@@ -33,6 +33,7 @@ void TapEthernetSystem::run()
 
 void TapEthernetSystem::shutdown()
 {
+    _driver.stop();
     _rxTimeout.cancel();
     transitionDone();
 }
diff --git a/platforms/posix/bsp/tapEthernetDriver/src/TapEthernetDriver.cpp b/platforms/posix/bsp/tapEthernetDriver/src/TapEthernetDriver.cpp
index 3ed4d8252a7..1c4de5365f3 100644
--- a/platforms/posix/bsp/tapEthernetDriver/src/TapEthernetDriver.cpp
+++ b/platforms/posix/bsp/tapEthernetDriver/src/TapEthernetDriver.cpp
@@ -64,11 +64,29 @@ TapEthernetDriver::TapEthernetDriver(::etl::array<uint8_t const, 6> const macAdd
 
 bool TapEthernetDriver::start(char const* const ifName)
 {
-    _tapFd = allocTapInterface(ifName);
-    return _tapFd >= 0;
+    if (_tapFd >= 0)
+    {
+        close(_tapFd);
+        _tapFd = -1;
+    }
+
+    int const fd = allocTapInterface(ifName);
+    if (fd < 0)
+    {
+        return false;
+    }
+    _tapFd = fd;
+    return true;
 }
 
-void TapEthernetDriver::stop() { _tapFd = -1; }
+void TapEthernetDriver::stop()
+{
+    if (_tapFd >= 0)
+    {
+        close(_tapFd);
+        _tapFd = -1;
+    }
+}
 
 void TapEthernetDriver::readFrame()
 {