pci: insert assert that auto-assigned-address function is single function device.

Auto-assigned-address pci function (passing devfn = -1) is always
single function.
This patch adds assert() to guarantee that auto-assigned-address function
is always single function device at function = 0.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

2 files changed, 3 insertions, 1 deletions

diff --git a/hw/pci.c b/hw/pci.c
index a7ff566..11d9b70 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -227,6 +227,7 @@ void pci_bus_new_inplace(PCIBus *bus, DeviceState *parent,
                          const char *name, int devfn_min)
 {
     qbus_create_inplace(&bus->qbus, &pci_bus_info, parent, name);
+    assert(PCI_FUNC(devfn_min) == 0);
     bus->devfn_min = devfn_min;
 
     /* host bridge */
@@ -608,7 +609,7 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
 {
     if (devfn < 0) {
         for(devfn = bus->devfn_min ; devfn < ARRAY_SIZE(bus->devices);
-            devfn += 8) {
+            devfn += PCI_FUNC_MAX) {
             if (!bus->devices[devfn])
                 goto found;
         }
diff --git a/hw/pci.h b/hw/pci.h
index 3a15bd4..68d5c4e 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -14,6 +14,7 @@
 #define PCI_DEVFN(slot, func)   ((((slot) & 0x1f) << 3) | ((func) & 0x07))
 #define PCI_SLOT(devfn)         (((devfn) >> 3) & 0x1f)
 #define PCI_FUNC(devfn)         ((devfn) & 0x07)
+#define PCI_FUNC_MAX            8
 
 /* Class, Vendor and Device IDs from Linux's pci_ids.h */
 #include "pci_ids.h"