[PATCH 13/17] ppc/pnv: remove stack pointer from PnvPHB4

[Daniel Henrique Barboza]

This pointer was being used for two reasons: pnv_phb4_update_regions()
was using it to access the PHB and phb4_realize() was using it as a way
to determine if the PHB was user created.

We can determine if the PHB is user created via phb->pec, introduced in
the previous patch, and pnv_phb4_update_regions() is no longer using
stack->phb.

Remove the pointer from the PnvPHB4 device.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb4.c         | 17 +++++------------
 hw/pci-host/pnv_phb4_pec.c     |  2 --
 include/hw/pci-host/pnv_phb4.h |  2 --
 3 files changed, 5 insertions(+), 16 deletions(-)

diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c
index c9117221b2..25b4248776 100644
--- a/hw/pci-host/pnv_phb4.c
+++ b/hw/pci-host/pnv_phb4.c
@@ -1549,9 +1549,10 @@ static void pnv_phb4_realize(DeviceState *dev, Error 
**errp)
     char name[32];
 
     /* User created PHB */
-    if (!phb->stack) {
+    if (!phb->pec) {
         PnvMachineState *pnv = PNV_MACHINE(qdev_get_machine());
         PnvChip *chip = pnv_get_chip(pnv, phb->chip_id);
+        PnvPhb4PecStack *stack;
         PnvPhb4PecClass *pecc;
         BusState *s;
 
@@ -1560,7 +1561,7 @@ static void pnv_phb4_realize(DeviceState *dev, Error 
**errp)
             return;
         }
 
-        phb->stack = pnv_phb4_get_stack(chip, phb, &local_err);
+        stack = pnv_phb4_get_stack(chip, phb, &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
             return;
@@ -1570,19 +1571,13 @@ static void pnv_phb4_realize(DeviceState *dev, Error 
**errp)
          * All other phb properties but 'pec', 'version' and
          * 'phb-number' are already set.
          */
-        object_property_set_link(OBJECT(phb), "pec", OBJECT(phb->stack->pec),
+        object_property_set_link(OBJECT(phb), "pec", OBJECT(stack->pec),
                                  &error_abort);
         pecc = PNV_PHB4_PEC_GET_CLASS(phb->pec);
         object_property_set_int(OBJECT(phb), "version", pecc->version,
                                 &error_fatal);
         object_property_set_int(OBJECT(phb), "phb-number",
-                                phb->stack->stack_no, &error_abort);
-
-        /*
-         * Assign stack->phb since pnv_phb4_update_regions() uses it
-         * to access the phb.
-         */
-        phb->stack->phb = phb;
+                                stack->stack_no, &error_abort);
 
         /*
          * Reparent user created devices to the chip to build
@@ -1686,8 +1681,6 @@ static Property pnv_phb4_properties[] = {
         DEFINE_PROP_UINT32("index", PnvPHB4, phb_id, 0),
         DEFINE_PROP_UINT32("chip-id", PnvPHB4, chip_id, 0),
         DEFINE_PROP_UINT64("version", PnvPHB4, version, 0),
-        DEFINE_PROP_LINK("stack", PnvPHB4, stack, TYPE_PNV_PHB4_PEC_STACK,
-                         PnvPhb4PecStack *),
         DEFINE_PROP_LINK("pec", PnvPHB4, pec, TYPE_PNV_PHB4_PEC,
                          PnvPhb4PecState *),
         DEFINE_PROP_END_OF_LIST(),
diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
index 36cc4ffe7c..1de0eb9adc 100644
--- a/hw/pci-host/pnv_phb4_pec.c
+++ b/hw/pci-host/pnv_phb4_pec.c
@@ -295,8 +295,6 @@ static void pnv_pec_stk_default_phb_realize(PnvPhb4PecStack 
*stack,
                             &error_fatal);
     object_property_set_int(OBJECT(stack->phb), "version", pecc->version,
                             &error_fatal);
-    object_property_set_link(OBJECT(stack->phb), "stack", OBJECT(stack),
-                             &error_abort);
 
     if (!sysbus_realize(SYS_BUS_DEVICE(stack->phb), errp)) {
         return;
diff --git a/include/hw/pci-host/pnv_phb4.h b/include/hw/pci-host/pnv_phb4.h
index f66bc76b78..90eb4575f8 100644
--- a/include/hw/pci-host/pnv_phb4.h
+++ b/include/hw/pci-host/pnv_phb4.h
@@ -154,8 +154,6 @@ struct PnvPHB4 {
     XiveSource xsrc;
     qemu_irq *qirqs;
 
-    PnvPhb4PecStack *stack;
-
     QLIST_HEAD(, PnvPhb4DMASpace) dma_spaces;
 };
 
-- 
2.33.1