[PATCH for-5.0 6/8] ppc/pnv: Link "chip" property to PnvHomer::chip pointer

[Greg Kurz <groug@kaod.org>]

The homer object has both a pointer and a "chip" property pointing to the
chip object. Confusing bugs could arise if these ever go out of sync.

Change the property definition so that it explicitely sets the pointer.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 hw/ppc/pnv.c       |    8 ++++----
 hw/ppc/pnv_homer.c |   24 +++++++++++++-----------
 2 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 96c5a23cd1eb..232c817452c0 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -904,8 +904,6 @@ static void pnv_chip_power8_instance_init(Object *obj)
 
     object_initialize_child(obj, "homer",  &chip8->homer, sizeof(chip8->homer),
                             TYPE_PNV8_HOMER, &error_abort, NULL);
-    object_property_add_const_link(OBJECT(&chip8->homer), "chip", obj,
-                                   &error_abort);
 }
 
 static void pnv_chip_icp_realize(Pnv8Chip *chip8, Error **errp)
@@ -1009,6 +1007,8 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error **errp)
                                 &chip8->occ.sram_regs);
 
     /* HOMER */
+    object_property_set_link(OBJECT(&chip8->homer), OBJECT(chip), "chip",
+                             &error_abort);
     object_property_set_bool(OBJECT(&chip8->homer), true, "realized",
                              &local_err);
     if (local_err) {
@@ -1104,8 +1104,6 @@ static void pnv_chip_power9_instance_init(Object *obj)
 
     object_initialize_child(obj, "homer",  &chip9->homer, sizeof(chip9->homer),
                             TYPE_PNV9_HOMER, &error_abort, NULL);
-    object_property_add_const_link(OBJECT(&chip9->homer), "chip", obj,
-                                   &error_abort);
 }
 
 static void pnv_chip_quad_realize(Pnv9Chip *chip9, Error **errp)
@@ -1222,6 +1220,8 @@ static void pnv_chip_power9_realize(DeviceState *dev, Error **errp)
                                 &chip9->occ.sram_regs);
 
     /* HOMER */
+    object_property_set_link(OBJECT(&chip9->homer), OBJECT(chip), "chip",
+                             &error_abort);
     object_property_set_bool(OBJECT(&chip9->homer), true, "realized",
                              &local_err);
     if (local_err) {
diff --git a/hw/ppc/pnv_homer.c b/hw/ppc/pnv_homer.c
index cc881a3b3289..cc08c1e34e2e 100644
--- a/hw/ppc/pnv_homer.c
+++ b/hw/ppc/pnv_homer.c
@@ -22,10 +22,10 @@
 #include "exec/memory.h"
 #include "sysemu/cpus.h"
 #include "hw/qdev-core.h"
+#include "hw/qdev-properties.h"
 #include "hw/ppc/pnv.h"
 #include "hw/ppc/pnv_homer.h"
 
-
 static bool core_max_array(PnvHomer *homer, hwaddr addr)
 {
     int i;
@@ -229,22 +229,23 @@ static void pnv_homer_realize(DeviceState *dev, Error **errp)
 {
     PnvHomer *homer = PNV_HOMER(dev);
     PnvHomerClass *hmrc = PNV_HOMER_GET_CLASS(homer);
-    Object *obj;
-    Error *local_err = NULL;
-
-    obj = object_property_get_link(OBJECT(dev), "chip", &local_err);
-    if (!obj) {
-        error_propagate(errp, local_err);
-        error_prepend(errp, "required link 'chip' not found: ");
-        return;
-    }
-    homer->chip = PNV_CHIP(obj);
+
+    assert(homer->chip);
+
     /* homer region */
     memory_region_init_io(&homer->regs, OBJECT(dev),
                           hmrc->homer_ops, homer, "homer-main-memory",
                           hmrc->homer_size);
 }
 
+static void pnv_homer_instance_init(Object *obj)
+{
+    object_property_add_link(obj, "chip", TYPE_PNV_CHIP,
+                             (Object **) &PNV_HOMER(obj)->chip,
+                             qdev_prop_allow_set_link_before_realize,
+                             OBJ_PROP_LINK_STRONG, &error_abort);
+}
+
 static void pnv_homer_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -258,6 +259,7 @@ static const TypeInfo pnv_homer_type_info = {
     .parent        = TYPE_DEVICE,
     .instance_size = sizeof(PnvHomer),
     .class_init    = pnv_homer_class_init,
+    .instance_init = pnv_homer_instance_init,
     .class_size    = sizeof(PnvHomerClass),
     .abstract      = true,
 };