[PATCH for-5.0 1/4] xics: Link ICS_PROP_XICS property to ICSState::xics pointer

[Greg Kurz]

The ICS object has both a pointer and an ICS_PROP_XICS property pointing
to the XICS fabric. Confusing bugs could arise if these ever go out of
sync.

Change the property definition so that it explicitely sets the pointer.
The property isn't optional : not being able to set the link is a bug
and QEMU should rather abort than exit in this case.

Signed-off-by: Greg Kurz <address@hidden>
---
 hw/intc/xics.c     |   13 +++----------
 hw/ppc/pnv_psi.c   |    3 +--
 hw/ppc/spapr_irq.c |    9 ++-------
 3 files changed, 6 insertions(+), 19 deletions(-)

diff --git a/hw/intc/xics.c b/hw/intc/xics.c
index e7ac9ba618fa..f7a454808992 100644
--- a/hw/intc/xics.c
+++ b/hw/intc/xics.c
@@ -609,17 +609,8 @@ static void ics_reset_handler(void *dev)
 static void ics_realize(DeviceState *dev, Error **errp)
 {
     ICSState *ics = ICS(dev);
-    Error *local_err = NULL;
-    Object *obj;
 
-    obj = object_property_get_link(OBJECT(dev), ICS_PROP_XICS, &local_err);
-    if (!obj) {
-        error_propagate_prepend(errp, local_err,
-                                "required link '" ICS_PROP_XICS
-                                "' not found: ");
-        return;
-    }
-    ics->xics = XICS_FABRIC(obj);
+    assert(ics->xics);
 
     if (!ics->nr_irqs) {
         error_setg(errp, "Number of interrupts needs to be greater 0");
@@ -699,6 +690,8 @@ static const VMStateDescription vmstate_ics = {
 
 static Property ics_properties[] = {
     DEFINE_PROP_UINT32("nr-irqs", ICSState, nr_irqs, 0),
+    DEFINE_PROP_LINK(ICS_PROP_XICS, ICSState, xics, TYPE_XICS_FABRIC,
+                     XICSFabric *),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/ppc/pnv_psi.c b/hw/ppc/pnv_psi.c
index a360515a86f8..7e725aaf2bd5 100644
--- a/hw/ppc/pnv_psi.c
+++ b/hw/ppc/pnv_psi.c
@@ -497,8 +497,7 @@ static void pnv_psi_power8_realize(DeviceState *dev, Error 
**errp)
     }
 
     /* Create PSI interrupt control source */
-    object_property_add_const_link(OBJECT(ics), ICS_PROP_XICS, obj,
-                                   &error_abort);
+    object_property_set_link(OBJECT(ics), obj, ICS_PROP_XICS, &error_abort);
     object_property_set_int(OBJECT(ics), PSI_NUM_INTERRUPTS, "nr-irqs", &err);
     if (err) {
         error_propagate(errp, err);
diff --git a/hw/ppc/spapr_irq.c b/hw/ppc/spapr_irq.c
index 168044be853a..487c8ceb35a3 100644
--- a/hw/ppc/spapr_irq.c
+++ b/hw/ppc/spapr_irq.c
@@ -319,13 +319,8 @@ void spapr_irq_init(SpaprMachineState *spapr, Error **errp)
             return;
         }
 
-        object_property_add_const_link(obj, ICS_PROP_XICS, OBJECT(spapr),
-                                       &local_err);
-        if (local_err) {
-            error_propagate(errp, local_err);
-            return;
-        }
-
+        object_property_set_link(obj, OBJECT(spapr), ICS_PROP_XICS,
+                                 &error_abort);
         object_property_set_int(obj, smc->nr_xirqs, "nr-irqs", &local_err);
         if (local_err) {
             error_propagate(errp, local_err);