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//0x20 bytes (sizeof)
struct _PCI_COMMON_EXTENSION
{
    VOID* Next;                                                             //0x0
    enum PCI_SIGNATURE ExtensionType;                                       //0x4
    struct _PCI_MJ_DISPATCH_TABLE* IrpDispatchTable;                        //0x8
    UCHAR DeviceState;                                                      //0xc
    UCHAR TentativeNextState;                                               //0xd
    struct _KEVENT SecondaryExtLock;                                        //0x10
};