From patchwork Tue Jul 1 08:48:41 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 365923 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 627591400F1 for ; Tue, 1 Jul 2014 18:50:16 +1000 (EST) Received: from localhost ([::1]:39567 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X1tlW-0000a6-Ak for incoming@patchwork.ozlabs.org; Tue, 01 Jul 2014 04:50:14 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51567) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X1tkm-0007eH-Ds for qemu-devel@nongnu.org; Tue, 01 Jul 2014 04:49:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1X1tkh-0006Bo-AU for qemu-devel@nongnu.org; Tue, 01 Jul 2014 04:49:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:18312) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X1tkh-0006Bh-20 for qemu-devel@nongnu.org; Tue, 01 Jul 2014 04:49:23 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s618nLtd004601 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 1 Jul 2014 04:49:21 -0400 Received: from localhost (ovpn-112-49.ams2.redhat.com [10.36.112.49]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s618nJfn009810; Tue, 1 Jul 2014 04:49:20 -0400 From: Stefan Hajnoczi To: Date: Tue, 1 Jul 2014 10:48:41 +0200 Message-Id: <1404204537-5082-9-git-send-email-stefanha@redhat.com> In-Reply-To: <1404204537-5082-1-git-send-email-stefanha@redhat.com> References: <1404204537-5082-1-git-send-email-stefanha@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Peter Maydell , Stefan Hajnoczi Subject: [Qemu-devel] [PULL for-2.1 08/24] virtio: fix virtio-blk child refcount in transports X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org object_initialize() leaves the object with a refcount of 1. object_property_add_child() adds its own reference which is dropped again when the property is deleted. The upshot of this is that we always have a refcount >= 1. Upon hot unplug the virtio-blk child is not finalized! Drop our reference after the child property has been added to the parent. Signed-off-by: Stefan Hajnoczi Reviewed-by: Peter Crosthwaite --- hw/s390x/s390-virtio-bus.c | 1 + hw/s390x/virtio-ccw.c | 1 + hw/virtio/virtio-pci.c | 1 + 3 files changed, 3 insertions(+) diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c index 38984ab..3438a88 100644 --- a/hw/s390x/s390-virtio-bus.c +++ b/hw/s390x/s390-virtio-bus.c @@ -179,6 +179,7 @@ static void s390_virtio_blk_instance_init(Object *obj) VirtIOBlkS390 *dev = VIRTIO_BLK_S390(obj); object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_BLK); object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL); + object_unref(OBJECT(&dev->vdev)); qdev_alias_all_properties(DEVICE(&dev->vdev), obj); } diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c index 9fa6f32..0553fea 100644 --- a/hw/s390x/virtio-ccw.c +++ b/hw/s390x/virtio-ccw.c @@ -813,6 +813,7 @@ static void virtio_ccw_blk_instance_init(Object *obj) VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(obj); object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_BLK); object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL); + object_unref(OBJECT(&dev->vdev)); qdev_alias_all_properties(DEVICE(&dev->vdev), obj); } diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 7359d8d..d41b864 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1101,6 +1101,7 @@ static void virtio_blk_pci_instance_init(Object *obj) VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(obj); object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_BLK); object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL); + object_unref(OBJECT(&dev->vdev)); qdev_alias_all_properties(DEVICE(&dev->vdev), obj); }