From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38360) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WxCfR-00063V-Lg for qemu-devel@nongnu.org; Wed, 18 Jun 2014 06:00:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WxCfL-0003uL-2T for qemu-devel@nongnu.org; Wed, 18 Jun 2014 06:00:33 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40388) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WxCfK-0003u6-OU for qemu-devel@nongnu.org; Wed, 18 Jun 2014 06:00:27 -0400 From: Stefan Hajnoczi Date: Wed, 18 Jun 2014 17:58:35 +0800 Message-Id: <1403085516-10340-9-git-send-email-stefanha@redhat.com> In-Reply-To: <1403085516-10340-1-git-send-email-stefanha@redhat.com> References: <1403085516-10340-1-git-send-email-stefanha@redhat.com> Subject: [Qemu-devel] [PATCH v4 8/9] 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: cornelia.huck@de.ibm.com, Paolo Bonzini , peter.crosthwaite@xilinx.com, Andreas Faerber , Stefan Hajnoczi 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 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 3bb782f..abf05a9 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)); qdev_alias_all_properties(DEVICE(&dev->vdev), obj); } -- 1.9.3