From patchwork Thu Apr 28 00:01:48 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 8964241 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id BE6BBBF29F for ; Thu, 28 Apr 2016 00:07:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D75E520260 for ; Thu, 28 Apr 2016 00:07:25 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id ABE8B2022A for ; Thu, 28 Apr 2016 00:07:24 +0000 (UTC) Received: from localhost ([::1]:45876 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1avZUI-0003wp-Lg for patchwork-qemu-devel@patchwork.kernel.org; Wed, 27 Apr 2016 20:07:22 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51489) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1avZPD-0001LK-Gj for qemu-devel@nongnu.org; Wed, 27 Apr 2016 20:02:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1avZPC-0005OO-CB for qemu-devel@nongnu.org; Wed, 27 Apr 2016 20:02:07 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50752) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1avZPC-0005O9-7p; Wed, 27 Apr 2016 20:02:06 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id BCCDB7F356; Thu, 28 Apr 2016 00:02:05 +0000 (UTC) Received: from red.redhat.com (ovpn-113-21.phx2.redhat.com [10.3.113.21]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u3S01vcr019347; Wed, 27 Apr 2016 20:02:04 -0400 From: Eric Blake To: qemu-devel@nongnu.org Date: Wed, 27 Apr 2016 18:01:48 -0600 Message-Id: <1461801715-24307-17-git-send-email-eblake@redhat.com> In-Reply-To: <1461801715-24307-1-git-send-email-eblake@redhat.com> References: <1461801715-24307-1-git-send-email-eblake@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v15 16/23] spapr_drc: Expose 'null' in qom-get when there is no fdt X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexander Graf , "open list:sPAPR" , armbru@redhat.com, David Gibson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Acked-by: David Gibson --- v15: no change v14: no change v13: no change v12: tweak commit message [no v10, v11] v9: improved commit message v8: rebase to 'name' motion v7: new patch, based on discussion about spapr_drc.c --- 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 3173940..72d725c 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); return; }