1 files changed, 6 insertions, 0 deletions
diff --git a/src/cpu/o3/cpu.cc b/src/cpu/o3/cpu.cc
index dfe42d882..580816372 100644
--- a/src/cpu/o3/cpu.cc
+++ b/src/cpu/o3/cpu.cc
@@ -819,6 +819,12 @@ unsigned int
 FullO3CPU<Impl>::drain(Event *drain_event)
 {
     DPRINTF(O3CPU, "Switching out\n");
+
+    // If the CPU isn't doing anything, then return immediately.
+    if (_status == Idle || _status == SwitchedOut) {
+        return 0;
+    }
+
     drainCount = 0;
     fetch.drain();
     decode.drain();