Revert "router: on linux add a mutex around the queue (#6709)" (#6726)

This reverts commit 987623567a.

src/mesh/Router.cpp

@@ -64,10 +64,6 @@ Router::Router() : concurrency::OSThread("Router"), fromRadioQueue(MAX_RX_FROMRA
  */
 int32_t Router::runOnce()
 {
-#ifdef ARCH_PORTDUINO
-    const std::lock_guard<std::mutex> lock(queueMutex);
-#endif
-
     meshtastic_MeshPacket *mp;
     while ((mp = fromRadioQueue.dequeuePtr(0)) != NULL) {
         // printPacket("handle fromRadioQ", mp);
@@ -84,10 +80,6 @@ int32_t Router::runOnce()
  */
 void Router::enqueueReceivedMessage(meshtastic_MeshPacket *p)
 {
-#ifdef ARCH_PORTDUINO
-    const std::lock_guard<std::mutex> lock(queueMutex);
-#endif
-
     // Try enqueue until successful
     while (!fromRadioQueue.enqueue(p, 0)) {
         meshtastic_MeshPacket *old_p;

src/mesh/Router.h

@@ -8,9 +8,6 @@
 #include "PointerQueue.h"
 #include "RadioInterface.h"
 #include "concurrency/OSThread.h"
-#ifdef ARCH_PORTDUINO
-#include <mutex>
-#endif
 
 /**
  * A mesh aware router that supports multiple interfaces.
@@ -22,12 +19,6 @@ class Router : protected concurrency::OSThread, protected PacketHistory
     /// forwarded to the phone.
     PointerQueue<meshtastic_MeshPacket> fromRadioQueue;
 
-#ifdef ARCH_PORTDUINO
-    /// linux calls enqueueReceivedMessage from an other thread when receiving UDP packets,
-    /// to avoid a data race with LoRa, lock that method.
-    std::mutex queueMutex;
-#endif
-
   protected:
     RadioInterface *iface = NULL;