diff -r cc47e11ccec1 -r 0b530c924765 src/cpu/simple/timing.hh
--- a/src/cpu/simple/timing.hh	Tue Jun 05 14:20:13 2012 -0400
+++ b/src/cpu/simple/timing.hh	Wed Jun 06 17:40:59 2012 +0100
@@ -171,7 +171,7 @@
             void schedule(PacketPtr _pkt, Tick t);
         };
 
-        EventWrapper<Port, &Port::sendRetry> retryEvent;
+        EventWrapper<MasterPort, &MasterPort::sendRetry> retryEvent;
     };
 
     class IcachePort : public TimingCPUPort
diff -r cc47e11ccec1 -r 0b530c924765 src/mem/bus.cc
--- a/src/mem/bus.cc	Tue Jun 05 14:20:13 2012 -0400
+++ b/src/mem/bus.cc	Wed Jun 06 17:40:59 2012 +0100
@@ -218,7 +218,10 @@
     // note that we might have blocked on the receiving port being
     // busy (rather than the bus itself) and now call retry before the
     // destination called retry on the bus
-    retryList.front()->sendRetry();
+    if (dynamic_cast<SlavePort*>(retryList.front()) != NULL)
+        (dynamic_cast<SlavePort*>(retryList.front()))->sendRetry();
+    else
+        (dynamic_cast<MasterPort*>(retryList.front()))->sendRetry();
 
     // If inRetry is still true, sendTiming wasn't called in zero time
     // (e.g. the cache does this)
diff -r cc47e11ccec1 -r 0b530c924765 src/mem/cache/base.hh
--- a/src/mem/cache/base.hh	Tue Jun 05 14:20:13 2012 -0400
+++ b/src/mem/cache/base.hh	Wed Jun 06 17:40:59 2012 +0100
@@ -204,7 +204,7 @@
 
       private:
 
-        EventWrapper<Port, &Port::sendRetry> sendRetryEvent;
+        EventWrapper<SlavePort, &SlavePort::sendRetry> sendRetryEvent;
 
     };
 
diff -r cc47e11ccec1 -r 0b530c924765 src/mem/port.hh
--- a/src/mem/port.hh	Tue Jun 05 14:20:13 2012 -0400
+++ b/src/mem/port.hh	Wed Jun 06 17:40:59 2012 +0100
@@ -70,10 +70,7 @@
 /**
  * Ports are used to interface memory objects to each other. A port is
  * either a master or a slave and the connected peer is always of the
- * opposite role.
- *
- * Each port has a name and an owner, and enables three basic types of
- * accesses to the peer port: functional, atomic and timing.
+ * opposite role. Each port has a name, an owner, and an identifier.
  */
 class Port
 {
@@ -91,9 +88,6 @@
      */
     const PortID id;
 
-    /** A pointer to the peer port.  */
-    Port* peer;
-
     /** A reference to the MemObject that owns this port. */
     MemObject& owner;
 
@@ -119,23 +113,6 @@
     /** Get the port id. */
     PortID getId() const { return id; }
 
-  protected:
-
-    /**
-     * Called by a peer port if sendTimingReq, sendTimingResp or
-     * sendTimingSnoopResp was unsuccesful, and had to wait.
-     */
-    virtual void recvRetry() = 0;
-
-  public:
-
-    /**
-     * Send a retry to a peer port that previously attempted a
-     * sendTimingReq, sendTimingResp or sendTimingSnoopResp which was
-     * unsuccessful.
-     */
-    void sendRetry() { return peer->recvRetry(); }
-
 };
 
 /** Forward declaration */
@@ -211,6 +188,12 @@
     bool sendTimingSnoopResp(PacketPtr pkt);
 
     /**
+     * Send a retry to the slave port that previously attempted a
+     * sendTimingResp to this master port and failed.
+     */
+    void sendRetry();
+
+    /**
      * Determine if this master port is snooping or not. The default
      * implementation returns false and thus tells the neighbour we
      * are not snooping. Any master port that wants to receive snoop
@@ -270,6 +253,14 @@
     }
 
     /**
+     * Called by the slave port if sendTimingReq or
+     * sendTimingSnoopResp was called on this master port (causing
+     * recvTimingReq and recvTimingSnoopResp to be called on the
+     * slave port) and was unsuccesful.
+     */
+    virtual void recvRetry() = 0;
+
+    /**
      * Called to receive an address range change from the peer slave
      * port. the default implementation ignored the change and does
      * nothing. Override this function in a derived class if the owner
@@ -347,6 +338,13 @@
     void sendTimingSnoopReq(PacketPtr pkt);
 
     /**
+     * Send a retry to the master port that previously attempted a
+     * sendTimingReq or sendTimingSnoopResp to this slave port and
+     * failed.
+     */
+    void sendRetry();
+
+    /**
      * Called by a peer port in order to determine the block size of
      * the owner of this port.
      */
@@ -396,6 +394,13 @@
         panic("%s was not expecting a timing snoop response\n", name());
     }
 
+    /**
+     * Called by the master port if sendTimingResp was called on this
+     * slave port (causing recvTimingResp to be called on the master
+     * port) and was unsuccesful.
+     */
+    virtual void recvRetry() = 0;
+
 };
 
 #endif //__MEM_PORT_HH__
diff -r cc47e11ccec1 -r 0b530c924765 src/mem/port.cc
--- a/src/mem/port.cc	Tue Jun 05 14:20:13 2012 -0400
+++ b/src/mem/port.cc	Wed Jun 06 17:40:59 2012 +0100
@@ -51,7 +51,7 @@
 #include "mem/port.hh"
 
 Port::Port(const std::string &_name, MemObject& _owner, PortID _id)
-    : portName(_name), id(_id), peer(NULL), owner(_owner)
+    : portName(_name), id(_id), owner(_owner)
 {
 }
 
@@ -86,7 +86,6 @@
 {
     // master port keeps track of the slave port
     _slavePort = &slave_port;
-    peer = &slave_port;
 
     // slave port also keeps track of master port
     _slavePort->bind(*this);
@@ -133,6 +132,12 @@
 }
 
 void
+MasterPort::sendRetry()
+{
+    _slavePort->recvRetry();
+}
+
+void
 MasterPort::printAddr(Addr a)
 {
     Request req(a, 1, 0, Request::funcMasterId);
@@ -159,7 +164,6 @@
 SlavePort::bind(MasterPort& master_port)
 {
     _masterPort = &master_port;
-    peer = &master_port;
 }
 
 MasterPort&
@@ -211,3 +215,9 @@
     assert(pkt->isRequest());
     _masterPort->recvTimingSnoopReq(pkt);
 }
+
+void
+SlavePort::sendRetry()
+{
+    _masterPort->recvRetry();
+}