vendor/acpica/20150930

1 files changed, 12 insertions, 0 deletions

diff --git a/source/components/debugger/dbexec.c b/source/components/debugger/dbexec.c
index ebd02b7c89276..af01ca277f41a 100644
--- a/source/components/debugger/dbexec.c
+++ b/source/components/debugger/dbexec.c
@@ -419,8 +419,20 @@ AcpiDbExecute (
 #ifdef ACPI_DEBUG_OUTPUT
     UINT32                  PreviousAllocations;
     UINT32                  Allocations;
+#endif
+
 
+    /*
+     * Allow one execution to be performed by debugger or single step
+     * execution will be dead locked by the interpreter mutexes.
+     */
+    if (AcpiGbl_MethodExecuting)
+    {
+        AcpiOsPrintf ("Only one debugger execution is allowed.\n");
+        return;
+    }
 
+#ifdef ACPI_DEBUG_OUTPUT
     /* Memory allocation tracking */
 
     PreviousAllocations = AcpiDbGetOutstandingAllocations ();