qdev: skip bus check for bus-less devices in qdev_unplug()

Since commit 2f7bd829db "qdev: Fix device_add bus assumptions"
it's possible to device_add bus-less device, but if such device is
unplugged it will dereference NULL parent_bus in qdev_unplug().

Fix it by taking in account that parent_bus might be NULL and
skipping bus check.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-id: 1367587536-14964-1-git-send-email-imammedo@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index ab1d8f5..069ac90 100644 (file)
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -208,7 +208,7 @@ void qdev_unplug(DeviceState *dev, Error **errp)
 {
     DeviceClass *dc = DEVICE_GET_CLASS(dev);
 
-    if (!dev->parent_bus->allow_hotplug) {
+    if (dev->parent_bus && !dev->parent_bus->allow_hotplug) {
         error_set(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
         return;
     }