[PATCH v2 4/6] hw/isa/piix{3, 4}: Factor out ISABus retrieval from create() functions

[Bernhard Beschow <shentey@gmail.com>]

Modernizes the code and even saves a few lines.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 hw/i386/pc_piix.c             | 3 ++-
 hw/isa/piix3.c                | 3 +--
 hw/isa/piix4.c                | 6 +-----
 hw/mips/malta.c               | 3 ++-
 include/hw/southbridge/piix.h | 4 ++--
 5 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 578e537b35..4d4b83a27d 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -206,9 +206,10 @@ static void pc_init1(MachineState *machine,
                               pci_memory, ram_memory);
         pcms->bus = pci_bus;
 
-        piix3 = piix3_create(pci_bus, &isa_bus);
+        piix3 = piix3_create(pci_bus);
         piix3->pic = x86ms->gsi;
         piix3_devfn = piix3->dev.devfn;
+        isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(piix3), "isa.0"));
     } else {
         pci_bus = NULL;
         i440fx_state = NULL;
diff --git a/hw/isa/piix3.c b/hw/isa/piix3.c
index de532cc692..c6ff7795f4 100644
--- a/hw/isa/piix3.c
+++ b/hw/isa/piix3.c
@@ -400,7 +400,7 @@ static void piix3_register_types(void)
 
 type_init(piix3_register_types)
 
-PIIX3State *piix3_create(PCIBus *pci_bus, ISABus **isa_bus)
+PIIX3State *piix3_create(PCIBus *pci_bus)
 {
     PIIX3State *piix3;
     PCIDevice *pci_dev;
@@ -409,7 +409,6 @@ PIIX3State *piix3_create(PCIBus *pci_bus, ISABus **isa_bus)
 
     pci_dev = pci_create_simple_multifunction(pci_bus, -1, true, type);
     piix3 = PIIX3_PCI_DEVICE(pci_dev);
-    *isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(piix3), "isa.0"));
 
     return piix3;
 }
diff --git a/hw/isa/piix4.c b/hw/isa/piix4.c
index 134d23aea7..4968c69da9 100644
--- a/hw/isa/piix4.c
+++ b/hw/isa/piix4.c
@@ -301,7 +301,7 @@ static void piix4_register_types(void)
 
 type_init(piix4_register_types)
 
-DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus, I2CBus **smbus)
+DeviceState *piix4_create(PCIBus *pci_bus, I2CBus **smbus)
 {
     PCIDevice *pci;
     DeviceState *dev;
@@ -311,10 +311,6 @@ DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus, I2CBus **smbus)
                                           TYPE_PIIX4_PCI_DEVICE);
     dev = DEVICE(pci);
 
-    if (isa_bus) {
-        *isa_bus = ISA_BUS(qdev_get_child_bus(dev, "isa.0"));
-    }
-
     if (smbus) {
         *smbus = piix4_pm_init(pci_bus, devfn + 3, 0x1100,
                                qdev_get_gpio_in_named(dev, "isa", 9),
diff --git a/hw/mips/malta.c b/hw/mips/malta.c
index 9ffdc5b8f1..e446b25ad0 100644
--- a/hw/mips/malta.c
+++ b/hw/mips/malta.c
@@ -1399,7 +1399,8 @@ void mips_malta_init(MachineState *machine)
     empty_slot_init("GT64120", 0, 0x20000000);
 
     /* Southbridge */
-    dev = piix4_create(pci_bus, &isa_bus, &smbus);
+    dev = piix4_create(pci_bus, &smbus);
+    isa_bus = ISA_BUS(qdev_get_child_bus(dev, "isa.0"));
 
     /* Interrupt controller */
     qdev_connect_gpio_out_named(dev, "intr", 0, i8259_irq);
diff --git a/include/hw/southbridge/piix.h b/include/hw/southbridge/piix.h
index 4d17400dfd..0bec7f8ca3 100644
--- a/include/hw/southbridge/piix.h
+++ b/include/hw/southbridge/piix.h
@@ -74,8 +74,8 @@ DECLARE_INSTANCE_CHECKER(PIIX3State, PIIX3_PCI_DEVICE,
 #define TYPE_PIIX3_XEN_DEVICE "PIIX3-xen"
 #define TYPE_PIIX4_PCI_DEVICE "piix4-isa"
 
-PIIX3State *piix3_create(PCIBus *pci_bus, ISABus **isa_bus);
+PIIX3State *piix3_create(PCIBus *pci_bus);
 
-DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus, I2CBus **smbus);
+DeviceState *piix4_create(PCIBus *pci_bus, I2CBus **smbus);
 
 #endif
-- 
2.36.1