From 85ed303bfe1f67a4c18ffe51916e73cffd7d9e9b Mon Sep 17 00:00:00 2001
From: Anthony Liguori <aliguori@us.ibm.com>
Date: Mon, 12 Dec 2011 14:29:25 -0600
Subject: qom: add a reference count to qdev objects

To ensure that a device isn't removed from the graph until all of its links are
broken.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 hw/qdev.c | 16 ++++++++++++++++
 hw/qdev.h | 26 ++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/hw/qdev.c b/hw/qdev.c
index 106407f226..fdc984312c 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -323,6 +323,11 @@ int qdev_unplug(DeviceState *dev)
     }
     assert(dev->info->unplug != NULL);
 
+    if (dev->ref != 0) {
+        qerror_report(QERR_DEVICE_IN_USE, dev->id?:"");
+        return -1;
+    }
+
     qdev_hot_removed = true;
 
     return dev->info->unplug(dev);
@@ -962,3 +967,14 @@ char* qdev_get_fw_dev_path(DeviceState *dev)
 
     return strdup(path);
 }
+
+void qdev_ref(DeviceState *dev)
+{
+    dev->ref++;
+}
+
+void qdev_unref(DeviceState *dev)
+{
+    g_assert(dev->ref > 0);
+    dev->ref--;
+}
diff --git a/hw/qdev.h b/hw/qdev.h
index 36a4198c89..2397b4e84c 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -45,6 +45,12 @@ struct DeviceState {
     QTAILQ_ENTRY(DeviceState) sibling;
     int instance_id_alias;
     int alias_required_for_version;
+
+    /**
+     * This tracks the number of references between devices.  See @qdev_ref for
+     * more information.
+     */
+    uint32_t ref;
 };
 
 typedef void (*bus_dev_printfn)(Monitor *mon, DeviceState *dev, int indent);
@@ -329,4 +335,24 @@ char *qdev_get_fw_dev_path(DeviceState *dev);
 /* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
 extern struct BusInfo system_bus_info;
 
+/**
+ * @qdev_ref
+ *
+ * Increase the reference count of a device.  A device cannot be freed as long
+ * as its reference count is greater than zero.
+ *
+ * @dev - the device
+ */
+void qdev_ref(DeviceState *dev);
+
+/**
+ * @qdef_unref
+ *
+ * Decrease the reference count of a device.  A device cannot be freed as long
+ * as its reference count is greater than zero.
+ *
+ * @dev - the device
+ */
+void qdev_unref(DeviceState *dev);
+
 #endif
-- 
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