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[Qemu-devel] [PULL 16/23] spapr_drc: Expose 'null' in qom-get when there

From: Markus Armbruster
Subject: [Qemu-devel] [PULL 16/23] spapr_drc: Expose 'null' in qom-get when there is no fdt
Date: Thu, 12 May 2016 09:59:03 +0200

From: Eric Blake <address@hidden>

Now that the QMP output visitor supports an explicit null
output, we should utilize it to make it easier to diagnose
the difference between a missing fdt ('null') vs. a
present-but-empty one ('{}').

(Note that this reverts the behavior of commit ab8bf1d, taking
us back to the behavior of commit 6c2f9a1 [which in turn
stemmed from a crash fix in 1d10b44]; but that this time,
the change is intentional and not an accidental side-effect.)

Signed-off-by: Eric Blake <address@hidden>
Acked-by: David Gibson <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Markus Armbruster <address@hidden>
 hw/ppc/spapr_drc.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
index 1f5f1d7..480a8c6 100644
--- a/hw/ppc/spapr_drc.c
+++ b/hw/ppc/spapr_drc.c
@@ -269,11 +269,7 @@ static void prop_get_fdt(Object *obj, Visitor *v, const 
char *name,
     void *fdt;
     if (!drc->fdt) {
-        visit_start_struct(v, name, NULL, 0, &err);
-        if (!err) {
-            visit_end_struct(v, &err);
-        }
-        error_propagate(errp, err);
+        visit_type_null(v, NULL, errp);

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