[Qemu-devel] [PATCH v2 2/2] qobject: Update coccinelle script to catch Q{INC, DEC}REF

[Eric Blake <eblake@redhat.com>]

The recent commit b097efc0 used qobject_decref(QOBJECT(E)), even
though we already have QDECREF(E) for that purpose.  We can update
our coccinelle script to catch any future relapses; with that in
place, the rest of the patch is generated with:
 spatch --sp-file scripts/coccinelle/qobject.cocci \
        --macro-file scripts/cocci-macro-file.h --dir . --in-place

Signed-off-by: Eric Blake <eblake@redhat.com>

---
v2: fix a misuse that crept in since v1
---
 monitor.c                        | 2 +-
 scripts/coccinelle/qobject.cocci | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/monitor.c b/monitor.c
index 3c369f4..b0fde7f 100644
--- a/monitor.c
+++ b/monitor.c
@@ -3829,7 +3829,7 @@ static void handle_qmp_command(JSONMessageParser *parser, GQueue *tokens)

     req_json = qobject_to_json(req);
     trace_handle_qmp_command(mon, qstring_get_str(req_json));
-    qobject_decref(QOBJECT(req_json));
+    QDECREF(req_json);

     rsp = qmp_dispatch(cur_mon->qmp.commands, req);

diff --git a/scripts/coccinelle/qobject.cocci b/scripts/coccinelle/qobject.cocci
index c3253de..c518caf 100644
--- a/scripts/coccinelle/qobject.cocci
+++ b/scripts/coccinelle/qobject.cocci
@@ -3,6 +3,12 @@
 expression Obj, Key, E;
 @@
 (
+- qobject_incref(QOBJECT(E));
++ QINCREF(E);
+|
+- qobject_decref(QOBJECT(E));
++ QDECREF(E);
+|
 - qdict_put_obj(Obj, Key, QOBJECT(E));
 + qdict_put(Obj, Key, E);
 |
-- 
2.9.4