[Qemu-devel] [PATCH v10 06/25] hmp: Drop pointless allocation during qapi visit

[Eric Blake]

The qapi visitor contract allows us to visit a virtual structure,
where we don't have any corresponding qapi struct.  Most such uses
pass NULL for @obj; but these two callers were passing a dummy
pointer, which then gets allocated to heap memory but then
immediately freed without use.  Clean this up to suppress unwanted
allocation, like we do elsewhere.

Signed-off-by: Eric Blake <address@hidden>
Reviewed-by: Marc-André Lureau <address@hidden>

---
v10: resplit 4/37 and 5/37 by action rather than file, retain R-b.
v9: no change
v8: no change
v7: place earlier in series, drop attempts to provide a 'kind' string,
drop bogus avoidance of qmp_object_del() on error
v6: new patch, split from RFC on v5 7/46
---
 hmp.c | 4 +---
 vl.c  | 4 +---
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/hmp.c b/hmp.c
index 54f2620..9537f7b 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1656,7 +1656,6 @@ void hmp_object_add(Monitor *mon, const QDict *qdict)
     QemuOpts *opts;
     char *type = NULL;
     char *id = NULL;
-    void *dummy = NULL;
     OptsVisitor *ov;
     QDict *pdict;

@@ -1668,7 +1667,7 @@ void hmp_object_add(Monitor *mon, const QDict *qdict)
     ov = opts_visitor_new(opts);
     pdict = qdict_clone_shallow(qdict);

-    visit_start_struct(opts_get_visitor(ov), &dummy, NULL, NULL, 0, &err);
+    visit_start_struct(opts_get_visitor(ov), NULL, NULL, NULL, 0, &err);
     if (err) {
         goto out_clean;
     }
@@ -1700,7 +1699,6 @@ out_clean:
     qemu_opts_del(opts);
     g_free(id);
     g_free(type);
-    g_free(dummy);

 out:
     hmp_handle_error(mon, &err);
diff --git a/vl.c b/vl.c
index f043009..b96590a 100644
--- a/vl.c
+++ b/vl.c
@@ -2824,7 +2824,6 @@ static int object_create(void *opaque, QemuOpts *opts, 
Error **errp)
     Error *err = NULL;
     char *type = NULL;
     char *id = NULL;
-    void *dummy = NULL;
     OptsVisitor *ov;
     QDict *pdict;
     bool (*type_predicate)(const char *) = opaque;
@@ -2832,7 +2831,7 @@ static int object_create(void *opaque, QemuOpts *opts, 
Error **errp)
     ov = opts_visitor_new(opts);
     pdict = qemu_opts_to_qdict(opts, NULL);

-    visit_start_struct(opts_get_visitor(ov), &dummy, NULL, NULL, 0, &err);
+    visit_start_struct(opts_get_visitor(ov), NULL, NULL, NULL, 0, &err);
     if (err) {
         goto out;
     }
@@ -2867,7 +2866,6 @@ out:
     QDECREF(pdict);
     g_free(id);
     g_free(type);
-    g_free(dummy);
     if (err) {
         error_report_err(err);
         return -1;
-- 
2.5.0