qdev: introduce reset call back for qbus level

and make it called via qbus_reset_all().
The qbus reset callback will be used by pci bus reset.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/hw/qdev.c b/hw/qdev.c
index 92ccc8d660..b76da07808 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -314,9 +314,17 @@ BusState *sysbus_get_default(void)
     return main_system_bus;
 }
 
+static int qbus_reset_one(BusState *bus, void *opaque)
+{
+    if (bus->info->reset) {
+        return bus->info->reset(bus);
+    }
+    return 0;
+}
+
 void qbus_reset_all(BusState *bus)
 {
-    qbus_walk_children(bus, qdev_reset_one, NULL, NULL);
+    qbus_walk_children(bus, qdev_reset_one, qbus_reset_one, NULL);
 }
 
 /* can be used as ->unplug() callback for the simple cases */