From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49262) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WnD3E-0005Yx-VU for qemu-devel@nongnu.org; Wed, 21 May 2014 16:23:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WnD38-00058m-Dy for qemu-devel@nongnu.org; Wed, 21 May 2014 16:23:48 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33079) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WnD38-00058a-3j for qemu-devel@nongnu.org; Wed, 21 May 2014 16:23:42 -0400 From: Stefan Hajnoczi Date: Wed, 21 May 2014 22:22:51 +0200 Message-Id: <1400703772-3324-7-git-send-email-stefanha@redhat.com> In-Reply-To: <1400703772-3324-1-git-send-email-stefanha@redhat.com> References: <1400703772-3324-1-git-send-email-stefanha@redhat.com> Subject: [Qemu-devel] [PATCH 6/7] virtio: fix virtio-blk child refcount in transports List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Peter Crosthwaite , Andreas Faerber , Stefan Hajnoczi , Frederic Konrad 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 --- 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 e7efcdb..79744b5 100644 --- a/hw/s390x/s390-virtio-bus.c +++ b/hw/s390x/s390-virtio-bus.c @@ -191,6 +191,7 @@ 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)); virtio_blk_add_child_aliases(obj, &dev->vdev); } diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c index 9e98713..7cc149e 100644 --- a/hw/s390x/virtio-ccw.c +++ b/hw/s390x/virtio-ccw.c @@ -738,6 +738,7 @@ 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)); virtio_blk_add_child_aliases(obj, &dev->vdev); } diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index c13fb09..1576786 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1102,6 +1102,7 @@ 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)); virtio_blk_add_child_aliases(obj, &dev->vdev); } -- 1.9.0