UINT8 __stdcall PopFxReleaseDevice(UINT64 BlFileId){
signed __int32 v1;
v1 = _InterlockedExchangeAdd((volatile signed __int32 *)(BlFileId + 244), 0xFFFFFFFF);
if( v1 == 1 )
LOBYTE(v1) = KeSetEvent((PRKEVENT)(BlFileId + 248), 0);
return v1;
}