From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0FB60C0650E for ; Wed, 3 Jul 2019 17:50:54 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DDAA92189E for ; Wed, 3 Jul 2019 17:50:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DDAA92189E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:38124 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hijPB-0007t3-72 for qemu-devel@archiver.kernel.org; Wed, 03 Jul 2019 13:50:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49065) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hij3y-0007og-7H for qemu-devel@nongnu.org; Wed, 03 Jul 2019 13:28:59 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hij3x-00005n-8F for qemu-devel@nongnu.org; Wed, 03 Jul 2019 13:28:58 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58968) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hij3u-0007t8-UJ; Wed, 03 Jul 2019 13:28:55 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8861188302; Wed, 3 Jul 2019 17:28:22 +0000 (UTC) Received: from localhost (ovpn-204-65.brq.redhat.com [10.40.204.65]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 22C0A1001B14; Wed, 3 Jul 2019 17:28:21 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Date: Wed, 3 Jul 2019 19:28:04 +0200 Message-Id: <20190703172813.6868-4-mreitz@redhat.com> In-Reply-To: <20190703172813.6868-1-mreitz@redhat.com> References: <20190703172813.6868-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Wed, 03 Jul 2019 17:28:22 +0000 (UTC) Content-Transfer-Encoding: quoted-printable 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 v2 03/12] block/stream: Swap backing file change order X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" bdrv_change_backing_file() can result in yields. Therefore, @base may no longer be the the backing_bs() of s->bottom afterwards. Just swap the order of the two calls to fix this. Signed-off-by: Max Reitz --- block/stream.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/stream.c b/block/stream.c index b27e61625d..6ac1e7bec4 100644 --- a/block/stream.c +++ b/block/stream.c @@ -78,8 +78,8 @@ static int stream_prepare(Job *job) base_fmt =3D base->drv->format_name; } } - ret =3D bdrv_change_backing_file(bs, base_id, base_fmt); bdrv_set_backing_hd(bs, base, &local_err); + ret =3D bdrv_change_backing_file(bs, base_id, base_fmt); if (local_err) { error_report_err(local_err); return -EPERM; --=20 2.21.0