qga-win: fsinfo: pci-info: allow partial info

The call to SetupDiGetDeviceRegistryProperty might fail because the
value doesn't exist in the registry, in this case we shouldn't exit from
the loop but instead continue to look for other available values in the
registry and set this value as unavailable (-1).

Signed-off-by: Sameeh Jubran <sjubran@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
(cherry picked from commit d42f51de2d10b318d396f4f439f7a3995fdc0f65)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

qga/commands-win32.c

@@ -506,7 +506,8 @@ static GuestPCIAddress *get_pci_info(char *guid, Error **errp)
 
     dev_info_data.cbSize = sizeof(SP_DEVINFO_DATA);
     for (i = 0; SetupDiEnumDeviceInfo(dev_info, i, &dev_info_data); i++) {
-        DWORD addr, bus, slot, func, dev, data, size2;
+        DWORD addr, bus, slot, data, size2;
+        int func, dev;
         while (!SetupDiGetDeviceRegistryProperty(dev_info, &dev_info_data,
                                             SPDRP_PHYSICAL_DEVICE_OBJECT_NAME,
                                             &data, (PBYTE)buffer, size,
@@ -536,21 +537,21 @@ static GuestPCIAddress *get_pci_info(char *guid, Error **errp)
          */
         if (!SetupDiGetDeviceRegistryProperty(dev_info, &dev_info_data,
                    SPDRP_BUSNUMBER, &data, (PBYTE)&bus, size, NULL)) {
-            break;
+            bus = -1;
         }
 
         /* The function retrieves the device's address. This value will be
          * transformed into device function and number */
         if (!SetupDiGetDeviceRegistryProperty(dev_info, &dev_info_data,
                    SPDRP_ADDRESS, &data, (PBYTE)&addr, size, NULL)) {
-            break;
+            addr = -1;
         }
 
         /* This call returns UINumber of DEVICE_CAPABILITIES structure.
          * This number is typically a user-perceived slot number. */
         if (!SetupDiGetDeviceRegistryProperty(dev_info, &dev_info_data,
                    SPDRP_UI_NUMBER, &data, (PBYTE)&slot, size, NULL)) {
-            break;
+            slot = -1;
         }
 
         /* SetupApi gives us the same information as driver with
@@ -560,12 +561,12 @@ static GuestPCIAddress *get_pci_info(char *guid, Error **errp)
          * DeviceNumber = (USHORT)(((propertyAddress) >> 16) & 0x0000FFFF);
          * SPDRP_ADDRESS is propertyAddress, so we do the same.*/
 
-        func = addr & 0x0000FFFF;
-        dev = (addr >> 16) & 0x0000FFFF;
+        func = ((int) addr == -1) ? -1 : addr & 0x0000FFFF;
+        dev = ((int) addr == -1) ? -1 : (addr >> 16) & 0x0000FFFF;
         pci->domain = dev;
-        pci->slot = slot;
+        pci->slot = (int) slot;
         pci->function = func;
-        pci->bus = bus;
+        pci->bus = (int) bus;
         break;
     }