Implement scsi device destruction

Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/scsi-bus.c

@@ -30,6 +30,7 @@ static int scsi_qdev_init(DeviceState *qdev, DeviceInfo *base)
     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
     SCSIDeviceInfo *info = DO_UPCAST(SCSIDeviceInfo, qdev, base);
     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
+    int rc = -1;
 
     if (dev->id == -1) {
         for (dev->id = 0; dev->id < bus->ndev; dev->id++) {
@@ -43,21 +44,38 @@ static int scsi_qdev_init(DeviceState *qdev, DeviceInfo *base)
     }
 
     if (bus->devs[dev->id]) {
-        bus->devs[dev->id]->info->destroy(bus->devs[dev->id]);
+        qdev_free(&bus->devs[dev->id]->qdev);
     }
     bus->devs[dev->id] = dev;
 
     dev->info = info;
-    return dev->info->init(dev);
+    rc = dev->info->init(dev);
+    if (rc != 0) {
+        bus->devs[dev->id] = NULL;
+    }
 
 err:
-    return -1;
+    return rc;
+}
+
+static int scsi_qdev_exit(DeviceState *qdev)
+{
+    SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
+    SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
+
+    assert(bus->devs[dev->id] != NULL);
+    if (bus->devs[dev->id]->info->destroy) {
+        bus->devs[dev->id]->info->destroy(bus->devs[dev->id]);
+    }
+    bus->devs[dev->id] = NULL;
+    return 0;
 }
 
 void scsi_qdev_register(SCSIDeviceInfo *info)
 {
     info->qdev.bus_info = &scsi_bus_info;
     info->qdev.init     = scsi_qdev_init;
+    info->qdev.exit     = scsi_qdev_exit;
     qdev_register(&info->qdev);
 }
 

hw/scsi-disk.c

@@ -936,11 +936,6 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
     }
 }
 
-static void scsi_destroy(SCSIDevice *d)
-{
-    qemu_free(d);
-}
-
 static int scsi_disk_initfn(SCSIDevice *dev)
 {
     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
@@ -974,7 +969,6 @@ static SCSIDeviceInfo scsi_disk_info = {
     .qdev.desc    = "virtual scsi disk or cdrom",
     .qdev.size    = sizeof(SCSIDiskState),
     .init         = scsi_disk_initfn,
-    .destroy      = scsi_destroy,
     .send_command = scsi_send_command,
     .read_data    = scsi_read_data,
     .write_data   = scsi_write_data,

hw/scsi-generic.c

@@ -668,8 +668,6 @@ static void scsi_destroy(SCSIDevice *d)
         qemu_free(r);
         r = n;
     }
-
-    qemu_free(d);
 }
 
 static int scsi_generic_initfn(SCSIDevice *dev)