mem: Provide better diagnostic for unconnected port

When _masterPort is null, a message to that effect is
more helpful than a segfault.

diff --git a/src/mem/port.hh b/src/mem/port.hh
index 8fefb2f3afead9d0c3f125b353df500d17f6ca49..28f4d7d687e2181bf3a4b1a38f95b2b537a89ea3 100644 (file)
--- a/src/mem/port.hh
+++ b/src/mem/port.hh
@@ -404,7 +404,11 @@ class SlavePort : public BaseSlavePort
     /**
      * Called by the owner to send a range change
      */
-    void sendRangeChange() const { _masterPort->recvRangeChange(); }
+    void sendRangeChange() const {
+        if (!_masterPort)
+            fatal("%s cannot sendRangeChange() without master port", name());
+        _masterPort->recvRangeChange();
+    }
 
     /**
      * Get a list of the non-overlapping address ranges the owner is