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-rw-r--r--scripts/qapi/common.py20
1 files changed, 13 insertions, 7 deletions
diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 1fa2f79990..18f5872808 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -873,6 +873,17 @@ def check_struct(expr, info):
                allow_metas=['struct'])
 
 
+def check_known_keys(info, source, keys, required, optional):
+    for key in keys:
+        if key not in required and key not in optional:
+            raise QAPISemError(info, "Unknown key '%s' in %s" % (key, source))
+
+    for key in required:
+        if key not in keys:
+            raise QAPISemError(info, "Key '%s' is missing from %s"
+                               % (key, source))
+
+
 def check_keys(expr_elem, meta, required, optional=[]):
     expr = expr_elem['expr']
     info = expr_elem['info']
@@ -880,10 +891,9 @@ def check_keys(expr_elem, meta, required, optional=[]):
     if not isinstance(name, str):
         raise QAPISemError(info, "'%s' key must have a string value" % meta)
     required = required + [meta]
+    source = "%s '%s'" % (meta, name)
+    check_known_keys(info, source, expr.keys(), required, optional)
     for (key, value) in expr.items():
-        if key not in required and key not in optional:
-            raise QAPISemError(info, "Unknown key '%s' in %s '%s'"
-                               % (key, meta, name))
         if key in ['gen', 'success-response'] and value is not False:
             raise QAPISemError(info,
                                "'%s' of %s '%s' should only use false value"
@@ -895,10 +905,6 @@ def check_keys(expr_elem, meta, required, optional=[]):
                                % (key, meta, name))
         if key == 'if':
             check_if(expr, info)
-    for key in required:
-        if key not in expr:
-            raise QAPISemError(info, "Key '%s' is missing from %s '%s'"
-                               % (key, meta, name))
 
 
 def check_exprs(exprs):