commit 85ed303bfe1f67a4c18ffe51916e73cffd7d9e9b
author Anthony Liguori <aliguori@us.ibm.com> Mon Dec 12 14:29:25 2011 -0600
committer Anthony Liguori <aliguori@us.ibm.com> Thu Dec 15 09:20:47 2011 -0600
tree 8d0188741f650e031c3f841778e6a1d07e1e21c5
parent 222f23f508a8d778f56eddef14752dfd26d225b4

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

diff --git a/hw/qdev.c b/hw/qdev.c
index 106407f..fdc9843 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -323,6 +323,11 @@
     }
     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 @@
 
     return strdup(path);
 }
+
+void qdev_ref(DeviceState *dev)
+{
+    dev->ref++;
+}
+
+void qdev_unref(DeviceState *dev)
+{
+    g_assert(dev->ref > 0);
+    dev->ref--;
+}