qom: optimize qdev_get_canonical_path using a parent link

The full tree search was a bit unreasonable.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/hw/qdev.h b/hw/qdev.h
index 4351e2e5af..fdab84835e 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -92,6 +92,10 @@ struct DeviceState {
     uint32_t ref;
 
     QTAILQ_HEAD(, DeviceProperty) properties;
+
+    /* Do not, under any circumstance, use this parent link below anywhere
+     * outside of qdev.c.  You have been warned. */
+    DeviceState *parent;
 };
 
 typedef void (*bus_dev_printfn)(Monitor *mon, DeviceState *dev, int indent);