From nobody Sat Feb 7 03:22:44 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1488359765256603.359325469101; Wed, 1 Mar 2017 01:16:05 -0800 (PST) Received: from localhost ([::1]:39207 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cj0Mc-0003Bq-07 for importer@patchew.org; Wed, 01 Mar 2017 04:16:02 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41775) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cj0DK-0003dt-4A for qemu-devel@nongnu.org; Wed, 01 Mar 2017 04:06:27 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cj0DG-0001j0-4T for qemu-devel@nongnu.org; Wed, 01 Mar 2017 04:06:26 -0500 Received: from mx1.redhat.com ([209.132.183.28]:37766) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cj0DF-0001iv-V6 for qemu-devel@nongnu.org; Wed, 01 Mar 2017 04:06:22 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (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 27A1A8047D for ; Wed, 1 Mar 2017 09:06:22 +0000 (UTC) Received: from localhost (ovpn-116-175.phx2.redhat.com [10.3.116.175]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v2196KAV030492; Wed, 1 Mar 2017 04:06:21 -0500 From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= To: qemu-devel@nongnu.org Date: Wed, 1 Mar 2017 13:04:48 +0400 Message-Id: <20170301090453.11075-24-marcandre.lureau@redhat.com> In-Reply-To: <20170301090453.11075-1-marcandre.lureau@redhat.com> References: <20170301090453.11075-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Wed, 01 Mar 2017 09:06:22 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 23/28] bus: do not unref hotplug handler 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: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" Apparently, none of the bus owner give a reference to the hotplug handler property, do not unref it on bus release. Furthermore, a bus is allowed to be its own hotplug handler, which can be seen in qbus_set_bus_hotplug_handler() function. However, in this case, the reference can't be given to the property, or this will create a cyclic dependency and the bus will never be free. Each bus owner should manage the lifecycle of the hotplug handler. Signed-off-by: Marc-Andr=C3=A9 Lureau Reviewed-by: Paolo Bonzini --- hw/acpi/piix4.c | 2 ++ hw/core/bus.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c index 6d99fe407c..a553a7e110 100644 --- a/hw/acpi/piix4.c +++ b/hw/acpi/piix4.c @@ -440,6 +440,8 @@ static void piix4_update_bus_hotplug(PCIBus *pci_bus, v= oid *opaque) { PIIX4PMState *s =3D opaque; =20 + /* pci_bus cannot outlive PIIX4PMState, because /machine keeps it alive + * and it's not hot-unpluggable */ qbus_set_hotplug_handler(BUS(pci_bus), DEVICE(s), &error_abort); } =20 diff --git a/hw/core/bus.c b/hw/core/bus.c index cf383fc1af..4651f24486 100644 --- a/hw/core/bus.c +++ b/hw/core/bus.c @@ -197,7 +197,7 @@ static void qbus_initfn(Object *obj) TYPE_HOTPLUG_HANDLER, (Object **)&bus->hotplug_handler, object_property_allow_set_link, - OBJ_PROP_LINK_UNREF_ON_RELEASE, + 0, NULL); object_property_add_bool(obj, "realized", bus_get_realized, bus_set_realized, NULL); --=20 2.12.0.rc2.3.gc93709801