Il 11/09/2013 09:45, Stefan Hajnoczi ha scritto:
> The qdev_free() function name is misleading since all the function does
> is unlink the device from its parent. The device is not necessarily
> freed.
>
> The device will be freed when its QObject refcount reaches zero. It is
> usual for the parent (bus) to hold the final reference but there are
> cases where something else holds a reference so "free" is a misleading
> name.
>
> I opted to keep a qdev wrapper function instead of making all callers
> use object_unparent(OBJECT(qdev)) directly due to the slightly ugly
> cast.
>
> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
> ---
> This patch is based on the "[PATCH 0/6] qdev and blockdev refcount leak fixes"
> series that I sent yesterday.
>
> hw/acpi/piix4.c | 2 +-
> hw/core/qdev.c | 10 +++++-----
> hw/pci/pci-hotplug-old.c | 2 +-
> hw/pci/pci_bridge.c | 2 +-
> hw/pci/pcie.c | 2 +-
> hw/pci/shpc.c | 2 +-
> hw/s390x/virtio-ccw.c | 2 +-
> hw/scsi/scsi-bus.c | 6 +++---
> hw/usb/bus.c | 4 ++--
> hw/usb/dev-storage.c | 2 +-
> hw/usb/host-legacy.c | 2 +-
> hw/virtio/virtio-bus.c | 2 +-
> hw/xen/xen_platform.c | 2 +-
> include/hw/qdev-core.h | 2 +-
> qdev-monitor.c | 2 +-
> 15 files changed, 22 insertions(+), 22 deletions(-)
>
> diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
> index 0b8d1d9..2ec9ada 100644
> --- a/hw/acpi/piix4.c
> +++ b/hw/acpi/piix4.c
> @@ -326,7 +326,7 @@ static void acpi_piix_eject_slot(PIIX4PMState *s,
> unsigned slots)
> if (pc->no_hotplug) {
> slot_free = false;
> } else {
> - qdev_free(qdev);
> + qdev_unparent(qdev);
> }
> }
> }
> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
> index 533f6dd..ac2352b 100644
> --- a/hw/core/qdev.c
> +++ b/hw/core/qdev.c
> @@ -164,7 +164,7 @@ int qdev_init(DeviceState *dev)
> if (local_err != NULL) {
> qerror_report_err(local_err);
> error_free(local_err);
> - qdev_free(dev);
> + qdev_unparent(dev);
> return -1;
> }
> return 0;
> @@ -258,7 +258,7 @@ void qbus_reset_all_fn(void *opaque)
> int qdev_simple_unplug_cb(DeviceState *dev)
> {
> /* just zap it */
> - qdev_free(dev);
> + qdev_unparent(dev);
> return 0;
> }
>
> @@ -280,8 +280,8 @@ void qdev_init_nofail(DeviceState *dev)
> }
> }
>
> -/* Unlink device from bus and free the structure. */
> -void qdev_free(DeviceState *dev)
> +/* Unlink device from bus. dev is freed if refcount reaches zero. */
> +void qdev_unparent(DeviceState *dev)
> {
> object_unparent(OBJECT(dev));
> }
> @@ -458,7 +458,7 @@ static void bus_unparent(Object *obj)
>
> while ((kid = QTAILQ_FIRST(&bus->children)) != NULL) {
> DeviceState *dev = kid->child;
> - qdev_free(dev);
> + qdev_unparent(dev);
> }
> if (bus->parent) {
> QLIST_REMOVE(bus, sibling);
> diff --git a/hw/pci/pci-hotplug-old.c b/hw/pci/pci-hotplug-old.c
> index 619fe47..f197f5f 100644
> --- a/hw/pci/pci-hotplug-old.c
> +++ b/hw/pci/pci-hotplug-old.c
> @@ -248,7 +248,7 @@ static PCIDevice *qemu_pci_hot_add_storage(Monitor *mon,
> }
> dev = pci_create(bus, devfn, "virtio-blk-pci");
> if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
> - qdev_free(&dev->qdev);
> + qdev_unparent(&dev->qdev);
> dev = NULL;
> break;
> }
> diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c
> index e6b22b8..68e0bcb 100644
> --- a/hw/pci/pci_bridge.c
> +++ b/hw/pci/pci_bridge.c
> @@ -391,7 +391,7 @@ void pci_bridge_exitfn(PCIDevice *pci_dev)
> pci_bridge_region_cleanup(s, s->windows);
> memory_region_destroy(&s->address_space_mem);
> memory_region_destroy(&s->address_space_io);
> - /* qbus_free() is called automatically by qdev_free() */
> + /* qbus_free() is called automatically by qdev_unparent() */
> }
>
> /*
> diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
> index 50af3c1..edd3f40 100644
> --- a/hw/pci/pcie.c
> +++ b/hw/pci/pcie.c
> @@ -251,7 +251,7 @@ static int pcie_cap_slot_hotplug(DeviceState *qdev,
> PCI_EXP_SLTSTA_PDS);
> pcie_cap_slot_event(d, PCI_EXP_HP_EV_PDC);
> } else {
> - qdev_free(&pci_dev->qdev);
> + qdev_unparent(&pci_dev->qdev);
> pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA,
> PCI_EXP_SLTSTA_PDS);
> pcie_cap_slot_event(d, PCI_EXP_HP_EV_PDC);
> diff --git a/hw/pci/shpc.c b/hw/pci/shpc.c
> index eb092fd..5ba2b17 100644
> --- a/hw/pci/shpc.c
> +++ b/hw/pci/shpc.c
> @@ -254,7 +254,7 @@ static void shpc_free_devices_in_slot(SHPCDevice *shpc,
> int slot)
> ++devfn) {
> PCIDevice *affected_dev = shpc->sec_bus->devices[devfn];
> if (affected_dev) {
> - qdev_free(&affected_dev->qdev);
> + qdev_unparent(&affected_dev->qdev);
> }
> }
> }
> diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
> index cd67db5..249a0ec 100644
> --- a/hw/s390x/virtio-ccw.c
> +++ b/hw/s390x/virtio-ccw.c
> @@ -1239,7 +1239,7 @@ static int virtio_ccw_busdev_unplug(DeviceState *dev)
>
> css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0);
>
> - qdev_free(dev);
> + qdev_unparent(dev);
> return 0;
> }
>
> diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
> index 5cd6137..cad3089 100644
> --- a/hw/scsi/scsi-bus.c
> +++ b/hw/scsi/scsi-bus.c
> @@ -176,7 +176,7 @@ static int scsi_qdev_init(DeviceState *qdev)
> d = scsi_device_find(bus, dev->channel, dev->id, dev->lun);
> assert(d);
> if (d->lun == dev->lun && dev != d) {
> - qdev_free(&d->qdev);
> + qdev_unparent(&d->qdev);
> }
> }
>
> @@ -229,13 +229,13 @@ SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus,
> BlockDriverState *bdrv,
> }
> if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
> error_setg(errp, "Setting drive property failed");
> - qdev_free(dev);
> + qdev_unparent(dev);
> return NULL;
> }
> object_property_set_bool(OBJECT(dev), true, "realized", &err);
> if (err != NULL) {
> error_propagate(errp, err);
> - qdev_free(dev);
> + qdev_unparent(dev);
> return NULL;
> }
> return SCSI_DEVICE(dev);
> diff --git a/hw/usb/bus.c b/hw/usb/bus.c
> index 82ca6a1..6eb4dd4 100644
> --- a/hw/usb/bus.c
> +++ b/hw/usb/bus.c
> @@ -353,7 +353,7 @@ void usb_port_location(USBPort *downstream, USBPort
> *upstream, int portnr)
> void usb_unregister_port(USBBus *bus, USBPort *port)
> {
> if (port->dev)
> - qdev_free(&port->dev->qdev);
> + qdev_unparent(&port->dev->qdev);
> QTAILQ_REMOVE(&bus->free, port, next);
> bus->nfree--;
> }
> @@ -501,7 +501,7 @@ int usb_device_delete_addr(int busnr, int addr)
> return -1;
> dev = port->dev;
>
> - qdev_free(&dev->qdev);
> + qdev_unparent(&dev->qdev);
> return 0;
> }
>
> diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c
> index 1d81ac2..4b855f2 100644
> --- a/hw/usb/dev-storage.c
> +++ b/hw/usb/dev-storage.c
> @@ -703,7 +703,7 @@ static USBDevice *usb_msd_init(USBBus *bus, const char
> *filename)
> return NULL;
> }
> if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
> - qdev_free(&dev->qdev);
> + qdev_unparent(&dev->qdev);
> return NULL;
> }
> if (qdev_init(&dev->qdev) < 0)
> diff --git a/hw/usb/host-legacy.c b/hw/usb/host-legacy.c
> index 3a5f705..c6d28d2 100644
> --- a/hw/usb/host-legacy.c
> +++ b/hw/usb/host-legacy.c
> @@ -132,7 +132,7 @@ USBDevice *usb_host_device_open(USBBus *bus, const char
> *devname)
> return dev;
>
> fail:
> - qdev_free(&dev->qdev);
> + qdev_unparent(&dev->qdev);
> return NULL;
> }
>
> diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c
> index 6849a01..a690939 100644
> --- a/hw/virtio/virtio-bus.c
> +++ b/hw/virtio/virtio-bus.c
> @@ -77,7 +77,7 @@ void virtio_bus_destroy_device(VirtioBusState *bus)
> klass->device_unplug(qbus->parent);
> }
> qdev = DEVICE(bus->vdev);
> - qdev_free(qdev);
> + qdev_unparent(qdev);
> bus->vdev = NULL;
> }
> }
> diff --git a/hw/xen/xen_platform.c b/hw/xen/xen_platform.c
> index 79bf0b3..0cb2489 100644
> --- a/hw/xen/xen_platform.c
> +++ b/hw/xen/xen_platform.c
> @@ -95,7 +95,7 @@ static void unplug_nic(PCIBus *b, PCIDevice *d, void *o)
> if (pci_get_word(d->config + PCI_CLASS_DEVICE) ==
> PCI_CLASS_NETWORK_ETHERNET
> && strcmp(d->name, "xen-pci-passthrough") != 0) {
> - qdev_free(DEVICE(d));
> + qdev_unparent(DEVICE(d));
> }
> }
>
> diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
> index a62f231..923e0d8 100644
> --- a/include/hw/qdev-core.h
> +++ b/include/hw/qdev-core.h
> @@ -237,7 +237,7 @@ void qdev_init_nofail(DeviceState *dev);
> void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
> int required_for_version);
> void qdev_unplug(DeviceState *dev, Error **errp);
> -void qdev_free(DeviceState *dev);
> +void qdev_unparent(DeviceState *dev);
> int qdev_simple_unplug_cb(DeviceState *dev);
> void qdev_machine_creation_done(void);
> bool qdev_machine_modified(void);
> diff --git a/qdev-monitor.c b/qdev-monitor.c
> index 5657cdc..eeb364f 100644
> --- a/qdev-monitor.c
> +++ b/qdev-monitor.c
> @@ -511,7 +511,7 @@ DeviceState *qdev_device_add(QemuOpts *opts)
> qdev->id = id;
> }
> if (qemu_opt_foreach(opts, set_property, qdev, 1) != 0) {
> - qdev_free(qdev);
> + qdev_unparent(qdev);
> object_unref(OBJECT(qdev));
> return NULL;
> }
>
Acked-by: Paolo Bonzini <pbonz...@redhat.com>
