[PATCH for-5.0 5/8] ppc/pnv: Link "psi" property to PnvOCC::psi pointer

[Greg Kurz]

The OCC object has both a pointer and a "psi" property pointing to the
PSI 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 <address@hidden>
---
 hw/ppc/pnv.c     |    8 ++++----
 hw/ppc/pnv_occ.c |   23 ++++++++++++-----------
 2 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 286901746f50..96c5a23cd1eb 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -901,8 +901,6 @@ static void pnv_chip_power8_instance_init(Object *obj)
 
     object_initialize_child(obj, "occ",  &chip8->occ, sizeof(chip8->occ),
                             TYPE_PNV8_OCC, &error_abort, NULL);
-    object_property_add_const_link(OBJECT(&chip8->occ), "psi",
-                                   OBJECT(&chip8->psi), &error_abort);
 
     object_initialize_child(obj, "homer",  &chip8->homer, sizeof(chip8->homer),
                             TYPE_PNV8_HOMER, &error_abort, NULL);
@@ -997,6 +995,8 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error 
**errp)
     }
 
     /* Create the simplified OCC model */
+    object_property_set_link(OBJECT(&chip8->occ), OBJECT(&chip8->psi), "psi",
+                             &error_abort);
     object_property_set_bool(OBJECT(&chip8->occ), true, "realized", 
&local_err);
     if (local_err) {
         error_propagate(errp, local_err);
@@ -1101,8 +1101,6 @@ static void pnv_chip_power9_instance_init(Object *obj)
 
     object_initialize_child(obj, "occ",  &chip9->occ, sizeof(chip9->occ),
                             TYPE_PNV9_OCC, &error_abort, NULL);
-    object_property_add_const_link(OBJECT(&chip9->occ), "psi",
-                                   OBJECT(&chip9->psi), &error_abort);
 
     object_initialize_child(obj, "homer",  &chip9->homer, sizeof(chip9->homer),
                             TYPE_PNV9_HOMER, &error_abort, NULL);
@@ -1210,6 +1208,8 @@ static void pnv_chip_power9_realize(DeviceState *dev, 
Error **errp)
                                             (uint64_t) PNV9_LPCM_BASE(chip));
 
     /* Create the simplified OCC model */
+    object_property_set_link(OBJECT(&chip9->occ), OBJECT(&chip9->psi), "psi",
+                             &error_abort);
     object_property_set_bool(OBJECT(&chip9->occ), true, "realized", 
&local_err);
     if (local_err) {
         error_propagate(errp, local_err);
diff --git a/hw/ppc/pnv_occ.c b/hw/ppc/pnv_occ.c
index 785653bb6710..084d580c1565 100644
--- a/hw/ppc/pnv_occ.c
+++ b/hw/ppc/pnv_occ.c
@@ -21,7 +21,7 @@
 #include "qapi/error.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
-
+#include "hw/qdev-properties.h"
 #include "hw/ppc/pnv.h"
 #include "hw/ppc/pnv_xscom.h"
 #include "hw/ppc/pnv_occ.h"
@@ -257,18 +257,10 @@ static void pnv_occ_realize(DeviceState *dev, Error 
**errp)
 {
     PnvOCC *occ = PNV_OCC(dev);
     PnvOCCClass *poc = PNV_OCC_GET_CLASS(occ);
-    Object *obj;
-    Error *local_err = NULL;
 
-    occ->occmisc = 0;
+    assert(occ->psi);
 
-    obj = object_property_get_link(OBJECT(dev), "psi", &local_err);
-    if (!obj) {
-        error_propagate(errp, local_err);
-        error_prepend(errp, "required link 'psi' not found: ");
-        return;
-    }
-    occ->psi = PNV_PSI(obj);
+    occ->occmisc = 0;
 
     /* XScom region for OCC registers */
     pnv_xscom_region_init(&occ->xscom_regs, OBJECT(dev), poc->xscom_ops,
@@ -279,6 +271,14 @@ static void pnv_occ_realize(DeviceState *dev, Error **errp)
                           occ, "occ-common-area", poc->sram_size);
 }
 
+static void pnv_occ_instance_init(Object *obj)
+{
+    object_property_add_link(obj, "psi", TYPE_PNV_PSI,
+                             (Object **) &PNV_OCC(obj)->psi,
+                             qdev_prop_allow_set_link_before_realize,
+                             OBJ_PROP_LINK_STRONG, &error_abort);
+}
+
 static void pnv_occ_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -291,6 +291,7 @@ static const TypeInfo pnv_occ_type_info = {
     .name          = TYPE_PNV_OCC,
     .parent        = TYPE_DEVICE,
     .instance_size = sizeof(PnvOCC),
+    .instance_init = pnv_occ_instance_init,
     .class_init    = pnv_occ_class_init,
     .class_size    = sizeof(PnvOCCClass),
     .abstract      = true,