hmp: fix regression of HMP device_del auto-completion

The commits:
 - 6a1fa9f5 (monitor: add del completion for peripheral device)
 - 66e56b13 (qdev: add qdev_build_hotpluggable_device_list helper)

cause a QEMU crash when trying to use HMP device_del auto-completion.
It can be easily reproduced by:
    <qemu-bin> -enable-kvm  ~/images/fedora.qcow2 -monitor stdio -device virtio-net-pci,id=vnet

    (qemu) device_del
    /home/mapfelba/git/upstream/qemu/hw/core/qdev.c:941:qdev_build_hotpluggable_device_list: Object 0x7f6ce04e4fe0 is not an instance of type device
    Aborted (core dumped)

The root cause is qdev_build_hotpluggable_device_list going recursively over
all peripherals and their children assuming all are devices. It doesn't work
since PCI devices have at least on child which is a memory region (bus master).

Solved by observing that all devices appear as direct children of
/machine/peripheral container. No need of going recursively
over all the children.

Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
Reported-by: Gal Hammer <ghammer@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-id: 1417002601-20799-1-git-send-email-marcel.a@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 4 insertions, 7 deletions

diff --git a/monitor.c b/monitor.c
index fa00594..f1031a1 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4321,17 +4321,14 @@ void object_add_completion(ReadLineState *rs, int nb_args, const char *str)
 static void peripheral_device_del_completion(ReadLineState *rs,
                                              const char *str, size_t len)
 {
-    Object *peripheral;
-    GSList *list = NULL, *item;
+    Object *peripheral = container_get(qdev_get_machine(), "/peripheral");
+    GSList *list, *item;
 
-    peripheral = object_resolve_path("/machine/peripheral/", NULL);
-    if (peripheral == NULL) {
+    list = qdev_build_hotpluggable_device_list(peripheral);
+    if (!list) {
         return;
     }
 
-    object_child_foreach(peripheral, qdev_build_hotpluggable_device_list,
-                         &list);
-
     for (item = list; item; item = g_slist_next(item)) {
         DeviceState *dev = item->data;