From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60040) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y9Gze-0003oU-Rg for qemu-devel@nongnu.org; Thu, 08 Jan 2015 12:35:46 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Y9GzZ-0006Ym-Ik for qemu-devel@nongnu.org; Thu, 08 Jan 2015 12:35:34 -0500 Received: from e35.co.us.ibm.com ([32.97.110.153]:46796) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y9GzZ-0006YZ-AH for qemu-devel@nongnu.org; Thu, 08 Jan 2015 12:35:29 -0500 Received: from /spool/local by e35.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 8 Jan 2015 10:35:28 -0700 From: Michael Roth Date: Thu, 8 Jan 2015 11:33:37 -0600 Message-Id: <1420738472-23267-34-git-send-email-mdroth@linux.vnet.ibm.com> In-Reply-To: <1420738472-23267-1-git-send-email-mdroth@linux.vnet.ibm.com> References: <1420738472-23267-1-git-send-email-mdroth@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 33/88] virtio/vhost-scsi: fix virtio-scsi/vhost-scsi child refcount in transports List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org From: Gonglei 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-scsi/vhost-scsi child is not finalized! Drop our reference after the child property has been added to the parent. Signed-off-by: Gonglei Reviewed-by: Cornelia Huck Cc: qemu-stable@nongnu.org Signed-off-by: Paolo Bonzini (cherry picked from commit 1312f12bcc8911ed99b67227fb9d1607295f71ed) Signed-off-by: Michael Roth --- hw/s390x/s390-virtio-bus.c | 2 ++ hw/s390x/virtio-ccw.c | 2 ++ hw/virtio/virtio-pci.c | 2 ++ 3 files changed, 6 insertions(+) diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c index eaaa275..4276034 100644 --- a/hw/s390x/s390-virtio-bus.c +++ b/hw/s390x/s390-virtio-bus.c @@ -258,6 +258,7 @@ static void s390_virtio_scsi_instance_init(Object *obj) VirtIOSCSIS390 *dev = VIRTIO_SCSI_S390(obj); object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_SCSI); object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL); + object_unref(OBJECT(&dev->vdev)); qdev_alias_all_properties(DEVICE(&dev->vdev), obj); } @@ -280,6 +281,7 @@ static void s390_vhost_scsi_instance_init(Object *obj) VHostSCSIS390 *dev = VHOST_SCSI_S390(obj); object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VHOST_SCSI); object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL); + object_unref(OBJECT(&dev->vdev)); qdev_alias_all_properties(DEVICE(&dev->vdev), obj); } #endif diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c index 458aabc..a466674 100644 --- a/hw/s390x/virtio-ccw.c +++ b/hw/s390x/virtio-ccw.c @@ -938,6 +938,7 @@ static void virtio_ccw_scsi_instance_init(Object *obj) VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(obj); object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_SCSI); object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL); + object_unref(OBJECT(&dev->vdev)); qdev_alias_all_properties(DEVICE(&dev->vdev), obj); } @@ -960,6 +961,7 @@ static void vhost_ccw_scsi_instance_init(Object *obj) VHostSCSICcw *dev = VHOST_SCSI_CCW(obj); object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VHOST_SCSI); object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL); + object_unref(OBJECT(&dev->vdev)); qdev_alias_all_properties(DEVICE(&dev->vdev), obj); } #endif diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index a3086a9..b632326 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1188,6 +1188,7 @@ static void virtio_scsi_pci_instance_init(Object *obj) VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(obj); object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_SCSI); object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL); + object_unref(OBJECT(&dev->vdev)); qdev_alias_all_properties(DEVICE(&dev->vdev), obj); } @@ -1244,6 +1245,7 @@ static void vhost_scsi_pci_instance_init(Object *obj) VHostSCSIPCI *dev = VHOST_SCSI_PCI(obj); object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VHOST_SCSI); object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL); + object_unref(OBJECT(&dev->vdev)); qdev_alias_all_properties(DEVICE(&dev->vdev), obj); } -- 1.9.1