reactos/drivers/storage/port/scsiport/fdo.c

/*
 * PROJECT:     ReactOS Storage Stack / SCSIPORT storage port library
 * LICENSE:     GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
 * PURPOSE:     Adapter device object (FDO) support routines
 * COPYRIGHT:   Eric Kohl (eric.kohl@reactos.org)
 *              Aleksey Bragin (aleksey@reactos.org)
 */

#include "scsiport.h"

#define NDEBUG
#include <debug.h>


static
NTSTATUS
SpiSendInquiry(
    _In_ PDEVICE_OBJECT DeviceObject,
    _Inout_ PSCSI_LUN_INFO LunInfo)
{
    IO_STATUS_BLOCK IoStatusBlock;
    PIO_STACK_LOCATION IrpStack;
    KEVENT Event;
    KIRQL Irql;
    PIRP Irp;
    NTSTATUS Status;
    PINQUIRYDATA InquiryBuffer;
    PSENSE_DATA SenseBuffer;
    BOOLEAN KeepTrying = TRUE;
    ULONG RetryCount = 0;
    SCSI_REQUEST_BLOCK Srb;
    PCDB Cdb;
    PSCSI_PORT_LUN_EXTENSION LunExtension;
    PSCSI_PORT_DEVICE_EXTENSION DeviceExtension;

    DPRINT("SpiSendInquiry() called\n");

    DeviceExtension = (PSCSI_PORT_DEVICE_EXTENSION)DeviceObject->DeviceExtension;

    InquiryBuffer = ExAllocatePoolWithTag(NonPagedPool, INQUIRYDATABUFFERSIZE, TAG_SCSIPORT);
    if (InquiryBuffer == NULL)
        return STATUS_INSUFFICIENT_RESOURCES;

    SenseBuffer = ExAllocatePoolWithTag(NonPagedPool, SENSE_BUFFER_SIZE, TAG_SCSIPORT);
    if (SenseBuffer == NULL)
    {
        ExFreePoolWithTag(InquiryBuffer, TAG_SCSIPORT);
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    while (KeepTrying)
    {
        /* Initialize event for waiting */
        KeInitializeEvent(&Event,
                          NotificationEvent,
                          FALSE);

        /* Create an IRP */
        Irp = IoBuildDeviceIoControlRequest(IOCTL_SCSI_EXECUTE_IN,
                                            DeviceObject,
                                            NULL,
                                            0,
                                            InquiryBuffer,
                                            INQUIRYDATABUFFERSIZE,
                                            TRUE,
                                            &Event,
                                            &IoStatusBlock);
        if (Irp == NULL)
        {
            DPRINT("IoBuildDeviceIoControlRequest() failed\n");

            /* Quit the loop */
            Status = STATUS_INSUFFICIENT_RESOURCES;
            KeepTrying = FALSE;
            continue;
        }

        /* Prepare SRB */
        RtlZeroMemory(&Srb, sizeof(SCSI_REQUEST_BLOCK));

        Srb.Length = sizeof(SCSI_REQUEST_BLOCK);
        Srb.OriginalRequest = Irp;
        Srb.PathId = LunInfo->PathId;
        Srb.TargetId = LunInfo->TargetId;
        Srb.Lun = LunInfo->Lun;
        Srb.Function = SRB_FUNCTION_EXECUTE_SCSI;
        Srb.SrbFlags = SRB_FLAGS_DATA_IN | SRB_FLAGS_DISABLE_SYNCH_TRANSFER;
        Srb.TimeOutValue = 4;
        Srb.CdbLength = 6;

        Srb.SenseInfoBuffer = SenseBuffer;
        Srb.SenseInfoBufferLength = SENSE_BUFFER_SIZE;

        Srb.DataBuffer = InquiryBuffer;
        Srb.DataTransferLength = INQUIRYDATABUFFERSIZE;

        /* Attach Srb to the Irp */
        IrpStack = IoGetNextIrpStackLocation (Irp);
        IrpStack->Parameters.Scsi.Srb = &Srb;

        /* Fill in CDB */
        Cdb = (PCDB)Srb.Cdb;
        Cdb->CDB6INQUIRY.OperationCode = SCSIOP_INQUIRY;
        Cdb->CDB6INQUIRY.LogicalUnitNumber = LunInfo->Lun;
        Cdb->CDB6INQUIRY.AllocationLength = INQUIRYDATABUFFERSIZE;

        /* Call the driver */
        Status = IoCallDriver(DeviceObject, Irp);

        /* Wait for it to complete */
        if (Status == STATUS_PENDING)
        {
            DPRINT("SpiSendInquiry(): Waiting for the driver to process request...\n");
            KeWaitForSingleObject(&Event,
                                  Executive,
                                  KernelMode,
                                  FALSE,
                                  NULL);
            Status = IoStatusBlock.Status;
        }

        DPRINT("SpiSendInquiry(): Request processed by driver, status = 0x%08X\n", Status);

        if (SRB_STATUS(Srb.SrbStatus) == SRB_STATUS_SUCCESS)
        {
            /* All fine, copy data over */
            RtlCopyMemory(LunInfo->InquiryData,
                          InquiryBuffer,
                          INQUIRYDATABUFFERSIZE);

            /* Quit the loop */
            Status = STATUS_SUCCESS;
            KeepTrying = FALSE;
            continue;
        }

        DPRINT("Inquiry SRB failed with SrbStatus 0x%08X\n", Srb.SrbStatus);

        /* Check if the queue is frozen */
        if (Srb.SrbStatus & SRB_STATUS_QUEUE_FROZEN)
        {
            /* Something weird happened, deal with it (unfreeze the queue) */
            KeepTrying = FALSE;

            DPRINT("SpiSendInquiry(): the queue is frozen at TargetId %d\n", Srb.TargetId);

            LunExtension = SpiGetLunExtension(DeviceExtension,
                                              LunInfo->PathId,
                                              LunInfo->TargetId,
                                              LunInfo->Lun);

            /* Clear frozen flag */
            LunExtension->Flags &= ~LUNEX_FROZEN_QUEUE;

            /* Acquire the spinlock */
            KeAcquireSpinLock(&DeviceExtension->SpinLock, &Irql);

            /* Process the request */
            SpiGetNextRequestFromLun(DeviceObject->DeviceExtension, LunExtension);

            /* SpiGetNextRequestFromLun() releases the spinlock,
                so we just lower irql back to what it was before */
            KeLowerIrql(Irql);
        }

        /* Check if data overrun happened */
        if (SRB_STATUS(Srb.SrbStatus) == SRB_STATUS_DATA_OVERRUN)
        {
            DPRINT("Data overrun at TargetId %d\n", LunInfo->TargetId);

            /* Nothing dramatic, just copy data, but limiting the size */
            RtlCopyMemory(LunInfo->InquiryData,
                            InquiryBuffer,
                            (Srb.DataTransferLength > INQUIRYDATABUFFERSIZE) ?
                            INQUIRYDATABUFFERSIZE : Srb.DataTransferLength);

            /* Quit the loop */
            Status = STATUS_SUCCESS;
            KeepTrying = FALSE;
        }
        else if ((Srb.SrbStatus & SRB_STATUS_AUTOSENSE_VALID) &&
                 SenseBuffer->SenseKey == SCSI_SENSE_ILLEGAL_REQUEST)
        {
            /* LUN is not valid, but some device responds there.
                Mark it as invalid anyway */

            /* Quit the loop */
            Status = STATUS_INVALID_DEVICE_REQUEST;
            KeepTrying = FALSE;
        }
        else
        {
            /* Retry a couple of times if no timeout happened */
            if ((RetryCount < 2) &&
                (SRB_STATUS(Srb.SrbStatus) != SRB_STATUS_NO_DEVICE) &&
                (SRB_STATUS(Srb.SrbStatus) != SRB_STATUS_SELECTION_TIMEOUT))
            {
                RetryCount++;
                KeepTrying = TRUE;
            }
            else
            {
                /* That's all, quit the loop */
                KeepTrying = FALSE;

                /* Set status according to SRB status */
                if (SRB_STATUS(Srb.SrbStatus) == SRB_STATUS_BAD_FUNCTION ||
                    SRB_STATUS(Srb.SrbStatus) == SRB_STATUS_BAD_SRB_BLOCK_LENGTH)
                {
                    Status = STATUS_INVALID_DEVICE_REQUEST;
                }
                else
                {
                    Status = STATUS_IO_DEVICE_ERROR;
                }
            }
        }
    }

    /* Free buffers */
    ExFreePoolWithTag(InquiryBuffer, TAG_SCSIPORT);
    ExFreePoolWithTag(SenseBuffer, TAG_SCSIPORT);

    DPRINT("SpiSendInquiry() done with Status 0x%08X\n", Status);

    return Status;
}

/* Scans all SCSI buses */
VOID
SpiScanAdapter(
    _In_ PSCSI_PORT_DEVICE_EXTENSION DeviceExtension)
{
    PSCSI_PORT_LUN_EXTENSION LunExtension;
    ULONG Bus;
    ULONG Target;
    ULONG Lun;
    PSCSI_BUS_SCAN_INFO BusScanInfo;
    PSCSI_LUN_INFO LastLunInfo, LunInfo, LunInfoExists;
    BOOLEAN DeviceExists;
    ULONG Hint;
    NTSTATUS Status;
    ULONG DevicesFound;

    DPRINT("SpiScanAdapter() called\n");

    /* Scan all buses */
    for (Bus = 0; Bus < DeviceExtension->BusNum; Bus++)
    {
        DPRINT("    Scanning bus %d\n", Bus);
        DevicesFound = 0;

        /* Get pointer to the scan information */
        BusScanInfo = DeviceExtension->BusesConfig->BusScanInfo[Bus];

        if (BusScanInfo)
        {
            /* Find the last LUN info in the list */
            LunInfo = DeviceExtension->BusesConfig->BusScanInfo[Bus]->LunInfo;
            LastLunInfo = LunInfo;

            while (LunInfo != NULL)
            {
                LastLunInfo = LunInfo;
                LunInfo = LunInfo->Next;
            }
        }
        else
        {
            /* We need to allocate this buffer */
            BusScanInfo = ExAllocatePoolWithTag(NonPagedPool, sizeof(SCSI_BUS_SCAN_INFO), TAG_SCSIPORT);
            if (!BusScanInfo)
            {
                DPRINT1("Out of resources!\n");
                return;
            }

            /* Store the pointer in the BusScanInfo array */
            DeviceExtension->BusesConfig->BusScanInfo[Bus] = BusScanInfo;

            /* Fill this struct (length and bus ids for now) */
            BusScanInfo->Length = sizeof(SCSI_BUS_SCAN_INFO);
            BusScanInfo->LogicalUnitsCount = 0;
            BusScanInfo->BusIdentifier = DeviceExtension->PortConfig->InitiatorBusId[Bus];
            BusScanInfo->LunInfo = NULL;

            /* Set pointer to the last LUN info to NULL */
            LastLunInfo = NULL;
        }

        /* Create LUN information structure */
        LunInfo = ExAllocatePoolWithTag(PagedPool, sizeof(SCSI_LUN_INFO), TAG_SCSIPORT);
        if (!LunInfo)
        {
            DPRINT1("Out of resources!\n");
            return;
        }

        RtlZeroMemory(LunInfo, sizeof(SCSI_LUN_INFO));

        /* Create LunExtension */
        LunExtension = SpiAllocateLunExtension(DeviceExtension);

        /* And send INQUIRY to every target */
        for (Target = 0; Target < DeviceExtension->PortConfig->MaximumNumberOfTargets; Target++)
        {
            /* TODO: Support scan bottom-up */

            /* Skip if it's the same address */
            if (Target == BusScanInfo->BusIdentifier)
                continue;

            /* Try to find an existing device here */
            DeviceExists = FALSE;
            LunInfoExists = BusScanInfo->LunInfo;

            /* Find matching address on this bus */
            while (LunInfoExists)
            {
                if (LunInfoExists->TargetId == Target)
                {
                    DeviceExists = TRUE;
                    break;
                }

                /* Advance to the next one */
                LunInfoExists = LunInfoExists->Next;
            }

            /* No need to bother rescanning, since we already did that before */
            if (DeviceExists)
                continue;

            /* Scan all logical units */
            for (Lun = 0; Lun < SCSI_MAXIMUM_LOGICAL_UNITS; Lun++)
            {
                if ((!LunExtension) || (!LunInfo))
                    break;

                /* Add extension to the list */
                Hint = (Target + Lun) % LUS_NUMBER;
                LunExtension->Next = DeviceExtension->LunExtensionList[Hint];
                DeviceExtension->LunExtensionList[Hint] = LunExtension;

                /* Fill Path, Target, Lun fields */
                LunExtension->PathId = LunInfo->PathId = (UCHAR)Bus;
                LunExtension->TargetId = LunInfo->TargetId = (UCHAR)Target;
                LunExtension->Lun = LunInfo->Lun = (UCHAR)Lun;

                /* Set flag to prevent race conditions */
                LunExtension->Flags |= SCSI_PORT_SCAN_IN_PROGRESS;

                /* Zero LU extension contents */
                if (DeviceExtension->LunExtensionSize)
                {
                    RtlZeroMemory(LunExtension + 1,
                                  DeviceExtension->LunExtensionSize);
                }

                /* Finally send the inquiry command */
                Status = SpiSendInquiry(DeviceExtension->DeviceObject, LunInfo);

                if (NT_SUCCESS(Status))
                {
                    /* Let's see if we really found a device */
                    PINQUIRYDATA InquiryData = (PINQUIRYDATA)LunInfo->InquiryData;

                    /* Check if this device is unsupported */
                    if (InquiryData->DeviceTypeQualifier == DEVICE_QUALIFIER_NOT_SUPPORTED)
                    {
                        DeviceExtension->LunExtensionList[Hint] =
                            DeviceExtension->LunExtensionList[Hint]->Next;

                        continue;
                    }

                    /* Clear the "in scan" flag */
                    LunExtension->Flags &= ~SCSI_PORT_SCAN_IN_PROGRESS;

                    DPRINT("SpiScanAdapter(): Found device of type %d at bus %d tid %d lun %d\n",
                        InquiryData->DeviceType, Bus, Target, Lun);

                    /*
                     * Cache the inquiry data into the LUN extension (or alternatively
                     * we could save a pointer to LunInfo within the LunExtension?)
                     */
                    RtlCopyMemory(&LunExtension->InquiryData,
                                  InquiryData,
                                  INQUIRYDATABUFFERSIZE);

                    /* Add this info to the linked list */
                    LunInfo->Next = NULL;
                    if (LastLunInfo)
                        LastLunInfo->Next = LunInfo;
                    else
                        BusScanInfo->LunInfo = LunInfo;

                    /* Store the last LUN info */
                    LastLunInfo = LunInfo;

                    /* Store DeviceObject */
                    LunInfo->DeviceObject = DeviceExtension->DeviceObject;

                    /* Allocate another buffer */
                    LunInfo = ExAllocatePoolWithTag(PagedPool, sizeof(SCSI_LUN_INFO), TAG_SCSIPORT);
                    if (!LunInfo)
                    {
                        DPRINT1("Out of resources!\n");
                        break;
                    }

                    RtlZeroMemory(LunInfo, sizeof(SCSI_LUN_INFO));

                    /* Create a new LU extension */
                    LunExtension = SpiAllocateLunExtension(DeviceExtension);

                    DevicesFound++;
                }
                else
                {
                    /* Remove this LUN from the list */
                    DeviceExtension->LunExtensionList[Hint] =
                        DeviceExtension->LunExtensionList[Hint]->Next;

                    /* Decide whether we are continuing or not */
                    if (Status == STATUS_INVALID_DEVICE_REQUEST)
                        continue;
                    else
                        break;
                }
            }
        }

        /* Free allocated buffers */
        if (LunExtension)
            ExFreePoolWithTag(LunExtension, TAG_SCSIPORT);

        if (LunInfo)
            ExFreePoolWithTag(LunInfo, TAG_SCSIPORT);

        /* Sum what we found */
        BusScanInfo->LogicalUnitsCount += (UCHAR)DevicesFound;
        DPRINT("    Found %d devices on bus %d\n", DevicesFound, Bus);
    }

    DPRINT("SpiScanAdapter() done\n");
}

/**
 * @brief      Calls HwInitialize routine of the miniport and sets up interrupts
 *             Should be called inside ScsiPortInitialize (for legacy drivers)
 *             or inside IRP_MN_START_DEVICE for pnp drivers
 *
 * @param[in]  DeviceExtension  The device extension
 *
 * @return     NTSTATUS of the operation
 */
NTSTATUS
CallHWInitialize(
    _In_ PSCSI_PORT_DEVICE_EXTENSION DeviceExtension)
{
    PPORT_CONFIGURATION_INFORMATION PortConfig = DeviceExtension->PortConfig;
    NTSTATUS Status = STATUS_SUCCESS;
    KIRQL OldIrql;

    /* Deal with interrupts */
    if (DeviceExtension->HwInterrupt == NULL ||
        (PortConfig->BusInterruptLevel == 0 && PortConfig->BusInterruptVector == 0))
    {
        /* No interrupts */
        DeviceExtension->InterruptCount = 0;

        DPRINT1("Interrupt Count: 0\n");

        UNIMPLEMENTED;

        /* This code path will ALWAYS crash so stop it now */
        __debugbreak();
    }
    else
    {
        BOOLEAN InterruptShareable;
        KINTERRUPT_MODE InterruptMode[2];
        ULONG InterruptVector[2], i, MappedIrq[2];
        KIRQL Dirql[2], MaxDirql;
        KAFFINITY Affinity[2];

        DeviceExtension->InterruptLevel[0] = PortConfig->BusInterruptLevel;
        DeviceExtension->InterruptLevel[1] = PortConfig->BusInterruptLevel2;

        InterruptVector[0] = PortConfig->BusInterruptVector;
        InterruptVector[1] = PortConfig->BusInterruptVector2;

        InterruptMode[0] = PortConfig->InterruptMode;
        InterruptMode[1] = PortConfig->InterruptMode2;

        DeviceExtension->InterruptCount =
            (PortConfig->BusInterruptLevel2 != 0 ||
             PortConfig->BusInterruptVector2 != 0) ? 2 : 1;

        for (i = 0; i < DeviceExtension->InterruptCount; i++)
        {
            /* Register an interrupt handler for this device */
            MappedIrq[i] = HalGetInterruptVector(
                PortConfig->AdapterInterfaceType, PortConfig->SystemIoBusNumber,
                DeviceExtension->InterruptLevel[i], InterruptVector[i], &Dirql[i],
                &Affinity[i]);
        }

        if (DeviceExtension->InterruptCount == 1 || Dirql[0] > Dirql[1])
            MaxDirql = Dirql[0];
        else
            MaxDirql = Dirql[1];

        for (i = 0; i < DeviceExtension->InterruptCount; i++)
        {
            /* Determine IRQ sharability as usual */
            if (PortConfig->AdapterInterfaceType == MicroChannel ||
                InterruptMode[i] == LevelSensitive)
            {
                InterruptShareable = TRUE;
            }
            else
            {
                InterruptShareable = FALSE;
            }

            Status = IoConnectInterrupt(
                &DeviceExtension->Interrupt[i], (PKSERVICE_ROUTINE)ScsiPortIsr, DeviceExtension,
                &DeviceExtension->IrqLock, MappedIrq[i], Dirql[i], MaxDirql, InterruptMode[i],
                InterruptShareable, Affinity[i], FALSE);

            if (!(NT_SUCCESS(Status)))
            {
                DPRINT1("Could not connect interrupt %d\n", InterruptVector[i]);
                DeviceExtension->Interrupt[i] = NULL;
                return Status;
            }
        }

        if (!NT_SUCCESS(Status))
            return Status;
    }

    /* Save IoAddress (from access ranges) */
    if (PortConfig->NumberOfAccessRanges != 0)
    {
        DeviceExtension->IoAddress = ((*(PortConfig->AccessRanges))[0]).RangeStart.LowPart;

        DPRINT("Io Address %x\n", DeviceExtension->IoAddress);
    }

    /* Set flag that it's allowed to disconnect during this command */
    DeviceExtension->Flags |= SCSI_PORT_DISCONNECT_ALLOWED;

    /* Initialize counter of active requests (-1 means there are none) */
    DeviceExtension->ActiveRequestCounter = -1;

    /* Analyze what we have about DMA */
    if (DeviceExtension->AdapterObject != NULL && PortConfig->Master &&
        PortConfig->NeedPhysicalAddresses)
    {
        DeviceExtension->MapRegisters = TRUE;
    }
    else
    {
        DeviceExtension->MapRegisters = FALSE;
    }

    /* Call HwInitialize at DISPATCH_LEVEL */
    KeRaiseIrql(DISPATCH_LEVEL, &OldIrql);

    if (!KeSynchronizeExecution(
            DeviceExtension->Interrupt[0], DeviceExtension->HwInitialize,
            DeviceExtension->MiniPortDeviceExtension))
    {
        DPRINT1("HwInitialize() failed!\n");
        KeLowerIrql(OldIrql);
        return STATUS_ADAPTER_HARDWARE_ERROR;
    }

    /* Check if a notification is needed */
    if (DeviceExtension->InterruptData.Flags & SCSI_PORT_NOTIFICATION_NEEDED)
    {
        /* Call DPC right away, because we're already at DISPATCH_LEVEL */
        ScsiPortDpcForIsr(NULL, DeviceExtension->DeviceObject, NULL, NULL);
    }

    /* Lower irql back to what it was */
    KeLowerIrql(OldIrql);

    return Status;
}

VOID
SpiCleanupAfterInit(
    _In_ PSCSI_PORT_DEVICE_EXTENSION DeviceExtension)
{
    PSCSI_LUN_INFO LunInfo;
    PVOID Ptr;
    ULONG Bus, Lun;

    /* Check if we have something to clean up */
    if (DeviceExtension == NULL)
        return;

    /* Stop the timer */
    IoStopTimer(DeviceExtension->DeviceObject);

    /* Disconnect the interrupts */
    while (DeviceExtension->InterruptCount)
    {
        if (DeviceExtension->Interrupt[--DeviceExtension->InterruptCount])
            IoDisconnectInterrupt(DeviceExtension->Interrupt[DeviceExtension->InterruptCount]);
    }

    /* Delete ConfigInfo */
    if (DeviceExtension->BusesConfig)
    {
        for (Bus = 0; Bus < DeviceExtension->BusNum; Bus++)
        {
            if (!DeviceExtension->BusesConfig->BusScanInfo[Bus])
                continue;

            LunInfo = DeviceExtension->BusesConfig->BusScanInfo[Bus]->LunInfo;

            while (LunInfo)
            {
                /* Free current, but save pointer to the next one */
                Ptr = LunInfo->Next;
                ExFreePool(LunInfo);
                LunInfo = Ptr;
            }

            ExFreePool(DeviceExtension->BusesConfig->BusScanInfo[Bus]);
        }

        ExFreePool(DeviceExtension->BusesConfig);
    }

    /* Free PortConfig */
    if (DeviceExtension->PortConfig)
        ExFreePool(DeviceExtension->PortConfig);

    /* Free LUNs*/
    for(Lun = 0; Lun < LUS_NUMBER; Lun++)
    {
        while (DeviceExtension->LunExtensionList[Lun])
        {
            Ptr = DeviceExtension->LunExtensionList[Lun];
            DeviceExtension->LunExtensionList[Lun] = DeviceExtension->LunExtensionList[Lun]->Next;

            ExFreePool(Ptr);
        }
    }

    /* Free common buffer (if it exists) */
    if (DeviceExtension->SrbExtensionBuffer != NULL &&
        DeviceExtension->CommonBufferLength != 0)
    {
            if (!DeviceExtension->AdapterObject)
            {
                ExFreePool(DeviceExtension->SrbExtensionBuffer);
            }
            else
            {
                HalFreeCommonBuffer(DeviceExtension->AdapterObject,
                                    DeviceExtension->CommonBufferLength,
                                    DeviceExtension->PhysicalAddress,
                                    DeviceExtension->SrbExtensionBuffer,
                                    FALSE);
            }
    }

    /* Free SRB info */
    if (DeviceExtension->SrbInfo != NULL)
        ExFreePool(DeviceExtension->SrbInfo);

    /* Unmap mapped addresses */
    while (DeviceExtension->MappedAddressList != NULL)
    {
        MmUnmapIoSpace(DeviceExtension->MappedAddressList->MappedAddress,
                       DeviceExtension->MappedAddressList->NumberOfBytes);

        Ptr = DeviceExtension->MappedAddressList;
        DeviceExtension->MappedAddressList = DeviceExtension->MappedAddressList->NextMappedAddress;

        ExFreePool(Ptr);
    }

    /* Finally delete the device object */
    DPRINT("Deleting device %p\n", DeviceExtension->DeviceObject);
    IoDeleteDevice(DeviceExtension->DeviceObject);
}