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spapr_drc: Expose 'null' in qom-get when there is no fdt 

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 <eblake@redhat.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <1461879932-9020-17-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2016-04-28 15:45:24 -06:00 committed by Markus Armbruster
parent 3df016f185
commit a543a554cf
1 changed files with 1 additions and 5 deletions
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6
hw/ppc/spapr_drc.c
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@ -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);
return;
}