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From c2d17bffc7268369f912357d7061db65e398432f Mon Sep 17 00:00:00 2001
Message-Id: <c2d17bffc7268369f912357d7061db65e398432f.1387288155.git.minovotn@redhat.com>
In-Reply-To: <527da6c2ce2c09d0183aa8595fc95f136f61b6df.1387288155.git.minovotn@redhat.com>
References: <527da6c2ce2c09d0183aa8595fc95f136f61b6df.1387288155.git.minovotn@redhat.com>
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Thu, 12 Dec 2013 16:21:22 +0100
Subject: [PATCH 2/8] qdev: Drop misleading qdev_free() function
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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RH-Author: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: <1386865288-1575-3-git-send-email-stefanha@redhat.com>
Patchwork-id: 56256
O-Subject: [RHEL7 qemu-kvm PATCH 2/8] qdev: Drop misleading qdev_free() function
Bugzilla: 1003773
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
RH-Acked-by: Markus Armbruster <armbru@redhat.com>

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.

Call object_unparent(obj) directly instead of having a qdev wrapper
function.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
(cherry picked from commit 02a5c4c97422b40034f31265e0f139f7846172a8)

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

Conflicts:
	hw/scsi/scsi-bus.c
	hw/xen/xen_platform.c

The conflicts are straightforward.
---
 hw/acpi/piix4.c        |  2 +-
 hw/core/qdev.c         | 12 +++---------
 hw/pci/pci-hotplug.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     |  4 ++--
 hw/usb/bus.c           |  7 ++++---
 hw/usb/dev-storage.c   |  2 +-
 hw/usb/host-legacy.c   |  2 +-
 hw/virtio/virtio-bus.c |  4 +---
 hw/xen/xen_platform.c  |  2 +-
 include/hw/qdev-core.h |  1 -
 qdev-monitor.c         |  2 +-
 15 files changed, 20 insertions(+), 28 deletions(-)

Signed-off-by: Michal Novotny <minovotn@redhat.com>
---
 hw/acpi/piix4.c        |  2 +-
 hw/core/qdev.c         | 12 +++---------
 hw/pci/pci-hotplug.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     |  4 ++--
 hw/usb/bus.c           |  7 ++++---
 hw/usb/dev-storage.c   |  2 +-
 hw/usb/host-legacy.c   |  2 +-
 hw/virtio/virtio-bus.c |  4 +---
 hw/xen/xen_platform.c  |  2 +-
 include/hw/qdev-core.h |  1 -
 qdev-monitor.c         |  2 +-
 15 files changed, 20 insertions(+), 28 deletions(-)

diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index d79a7b0..8af97cf 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -315,7 +315,7 @@ static void acpi_piix_eject_slot(PIIX4PMState *s, unsigned slots)
             if (pc->no_hotplug) {
                 slot_free = false;
             } else {
-                qdev_free(qdev);
+                object_unparent(OBJECT(qdev));
             }
         }
     }
diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index 9190a7e..70a0dee 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);
+        object_unparent(OBJECT(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);
+    object_unparent(OBJECT(dev));
     return 0;
 }
 
@@ -280,12 +280,6 @@ void qdev_init_nofail(DeviceState *dev)
     }
 }
 
-/* Unlink device from bus and free the structure.  */
-void qdev_free(DeviceState *dev)
-{
-    object_unparent(OBJECT(dev));
-}
-
 void qdev_machine_creation_done(void)
 {
     /*
@@ -458,7 +452,7 @@ static void bus_unparent(Object *obj)
 
     while ((kid = QTAILQ_FIRST(&bus->children)) != NULL) {
         DeviceState *dev = kid->child;
-        qdev_free(dev);
+        object_unparent(OBJECT(dev));
     }
     if (bus->parent) {
         QLIST_REMOVE(bus, sibling);
diff --git a/hw/pci/pci-hotplug.c b/hw/pci/pci-hotplug.c
index c708752..667e40c 100644
--- a/hw/pci/pci-hotplug.c
+++ b/hw/pci/pci-hotplug.c
@@ -224,7 +224,7 @@ 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);
+            object_unparent(OBJECT(dev));
             dev = NULL;
             break;
         }
diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c
index 3897bd8..a786f26 100644
--- a/hw/pci/pci_bridge.c
+++ b/hw/pci/pci_bridge.c
@@ -386,7 +386,7 @@ 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 during device deletion */
 }
 
 /*
diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index 62bd0b8..4b84443 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);
+        object_unparent(OBJECT(pci_dev));
         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 d35c2ee..1e57952 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);
+            object_unparent(OBJECT(affected_dev));
         }
     }
 }
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index d981101..7ba1376 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1036,7 +1036,7 @@ static int virtio_ccw_busdev_unplug(DeviceState *dev)
 
     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0);
 
-    qdev_free(dev);
+    object_unparent(OBJECT(dev));
     return 0;
 }
 
diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index 9082ea7..6733c1a 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -178,7 +178,7 @@ 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);
+            object_unparent(OBJECT(d));
         }
     }
 
@@ -229,7 +229,7 @@ SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv,
         qdev_prop_set_string(dev, "serial", serial);
     }
     if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
-        qdev_free(dev);
+        object_unparent(OBJECT(dev));
         return NULL;
     }
     if (qdev_init(dev) < 0)
diff --git a/hw/usb/bus.c b/hw/usb/bus.c
index f83d1de..ade9abc 100644
--- a/hw/usb/bus.c
+++ b/hw/usb/bus.c
@@ -351,8 +351,9 @@ 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);
+    if (port->dev) {
+        object_unparent(OBJECT(port->dev));
+    }
     QTAILQ_REMOVE(&bus->free, port, next);
     bus->nfree--;
 }
@@ -500,7 +501,7 @@ int usb_device_delete_addr(int busnr, int addr)
         return -1;
     dev = port->dev;
 
-    qdev_free(&dev->qdev);
+    object_unparent(OBJECT(dev));
     return 0;
 }
 
diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c
index 44a0e34..f60b048 100644
--- a/hw/usb/dev-storage.c
+++ b/hw/usb/dev-storage.c
@@ -699,7 +699,7 @@ 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);
+        object_unparent(OBJECT(dev));
         return NULL;
     }
     if (qdev_init(&dev->qdev) < 0)
diff --git a/hw/usb/host-legacy.c b/hw/usb/host-legacy.c
index 3a5f705..3cc9c42 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);
+    object_unparent(OBJECT(dev));
     return NULL;
 }
 
diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c
index 6849a01..e6b103c 100644
--- a/hw/virtio/virtio-bus.c
+++ b/hw/virtio/virtio-bus.c
@@ -67,7 +67,6 @@ void virtio_bus_reset(VirtioBusState *bus)
 /* Destroy the VirtIODevice */
 void virtio_bus_destroy_device(VirtioBusState *bus)
 {
-    DeviceState *qdev;
     BusState *qbus = BUS(bus);
     VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
     DPRINTF("%s: remove device.\n", qbus->name);
@@ -76,8 +75,7 @@ void virtio_bus_destroy_device(VirtioBusState *bus)
         if (klass->device_unplug != NULL) {
             klass->device_unplug(qbus->parent);
         }
-        qdev = DEVICE(bus->vdev);
-        qdev_free(qdev);
+        object_unparent(OBJECT(bus->vdev));
         bus->vdev = NULL;
     }
 }
diff --git a/hw/xen/xen_platform.c b/hw/xen/xen_platform.c
index bb9d0cd..98fe405 100644
--- a/hw/xen/xen_platform.c
+++ b/hw/xen/xen_platform.c
@@ -88,7 +88,7 @@ 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(&d->qdev);
+        object_unparent(OBJECT(d));
     }
 }
 
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 44feb54..ad39ea9 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -232,7 +232,6 @@ 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);
 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 9d4f61d..f78ff64 100644
--- a/qdev-monitor.c
+++ b/qdev-monitor.c
@@ -521,7 +521,7 @@ DeviceState *qdev_device_add(QemuOpts *opts)
         qdev->id = id;
     }
     if (qemu_opt_foreach(opts, set_property, qdev, 1) != 0) {
-        qdev_free(qdev);
+        object_unparent(OBJECT(qdev));
         object_unref(OBJECT(qdev));
         return NULL;
     }
-- 
1.7.11.7