[Qemu-devel] [PATCH v6 2/4] ahci.c: Don't assume AHCIState's parent is AHCIPCIState

[Alistair Francis <alistair.francis@xilinx.com>]

The AHCIState struct can either have AHCIPCIState or SysbusAHCIState
as a parent. The ahci_irq_lower() and ahci_irq_raise() functions
assume that it is always AHCIPCIState, which is not always the
case, which causes a seg fault. Verify what the container of AHCIState
is before setting the PCIDevice struct.

Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
---
V5:
 - Remove the return checks when setting PCIDevice
V4:
 - Remove unnesicary casts
 - Use object_dynamic_cast() instead of object_class_dynamic_cast()

 hw/ide/ahci.c |   13 +++++++------
 hw/ide/ahci.h |    2 ++
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 02d85fa..d83efa4 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -121,9 +121,9 @@ static uint32_t  ahci_port_read(AHCIState *s, int port, int offset)
 
 static void ahci_irq_raise(AHCIState *s, AHCIDevice *dev)
 {
-    AHCIPCIState *d = container_of(s, AHCIPCIState, ahci);
-    PCIDevice *pci_dev =
-        (PCIDevice *)object_dynamic_cast(OBJECT(d), TYPE_PCI_DEVICE);
+    DeviceState *dev_state = s->container;
+    PCIDevice *pci_dev = (PCIDevice *) object_dynamic_cast(OBJECT(dev_state),
+                                                           TYPE_PCI_DEVICE);
 
     DPRINTF(0, "raise irq\n");
 
@@ -136,9 +136,9 @@ static void ahci_irq_raise(AHCIState *s, AHCIDevice *dev)
 
 static void ahci_irq_lower(AHCIState *s, AHCIDevice *dev)
 {
-    AHCIPCIState *d = container_of(s, AHCIPCIState, ahci);
-    PCIDevice *pci_dev =
-        (PCIDevice *)object_dynamic_cast(OBJECT(d), TYPE_PCI_DEVICE);
+    DeviceState *dev_state = s->container;
+    PCIDevice *pci_dev = (PCIDevice *) object_dynamic_cast(OBJECT(dev_state),
+                                                           TYPE_PCI_DEVICE);
 
     DPRINTF(0, "lower irq\n");
 
@@ -1436,6 +1436,7 @@ void ahci_init(AHCIState *s, DeviceState *qdev, AddressSpace *as, int ports)
     s->as = as;
     s->ports = ports;
     s->dev = g_new0(AHCIDevice, ports);
+    s->container = qdev;
     ahci_reg_init(s);
     /* XXX BAR size should be 1k, but that breaks, so bump it to 4k for now */
     memory_region_init_io(&s->mem, OBJECT(qdev), &ahci_mem_ops, s,
diff --git a/hw/ide/ahci.h b/hw/ide/ahci.h
index c055d6b..c9b3805 100644
--- a/hw/ide/ahci.h
+++ b/hw/ide/ahci.h
@@ -287,6 +287,8 @@ struct AHCIDevice {
 };
 
 typedef struct AHCIState {
+    DeviceState *container;
+
     AHCIDevice *dev;
     AHCIControlRegs control_regs;
     MemoryRegion mem;
-- 
1.7.1