fdo.c File Reference

#include "precomp.h"
#include <debug.h>

Include dependency graph for fdo.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
static BOOLEAN NTAPI	PortFdoInterruptRoutine (_In_ PKINTERRUPT Interrupt, _In_ PVOID ServiceContext)
static NTSTATUS	PortFdoConnectInterrupt (_In_ PFDO_DEVICE_EXTENSION DeviceExtension)
static NTSTATUS	PortFdoStartMiniport (_In_ PFDO_DEVICE_EXTENSION DeviceExtension)
static NTSTATUS NTAPI	PortFdoStartDevice (_In_ PFDO_DEVICE_EXTENSION DeviceExtension, _In_ PIRP Irp)
static NTSTATUS	PortSendInquiry (_In_ PPDO_DEVICE_EXTENSION PdoExtension)
static NTSTATUS	PortFdoScanBus (_In_ PFDO_DEVICE_EXTENSION DeviceExtension)
static NTSTATUS	PortFdoQueryBusRelations (_In_ PFDO_DEVICE_EXTENSION DeviceExtension, _Out_ PULONG_PTR Information)
static NTSTATUS	PortFdoFilterRequirements (PFDO_DEVICE_EXTENSION DeviceExtension, PIRP Irp)
NTSTATUS NTAPI	PortFdoScsi (_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp)
NTSTATUS NTAPI	PortFdoPnp (_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp)

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 12 of file fdo.c.

Function Documentation

PortFdoConnectInterrupt()

static NTSTATUS PortFdoConnectInterrupt ( _In_ PFDO_DEVICE_EXTENSION  DeviceExtension )

static

Definition at line 38 of file fdo.c.

{
    ULONG Vector;
    KIRQL Irql;
    KINTERRUPT_MODE InterruptMode;
    BOOLEAN ShareVector;
    KAFFINITY Affinity;
    NTSTATUS Status;
 
    DPRINT1("PortFdoConnectInterrupt(%p)\n",
            DeviceExtension);
 
    /* No resources, no interrupt. Done! */
    if (DeviceExtension->AllocatedResources == NULL ||
        DeviceExtension->TranslatedResources == NULL)
    {
        DPRINT1("Checkpoint\n");
        return STATUS_SUCCESS;
    }
 
    /* Get the interrupt data from the resource list */
    Status = GetResourceListInterrupt(DeviceExtension,
                                      &Vector,
                                      &Irql,
                                      &InterruptMode,
                                      &ShareVector,
                                      &Affinity);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("GetResourceListInterrupt() failed (Status 0x%08lx)\n", Status);
        return Status;
    }
 
    DPRINT1("Vector: %lu\n", Vector);
    DPRINT1("Irql: %lu\n", Irql);
 
    DPRINT1("Affinity: 0x%08lx\n", Affinity);
 
    /* Connect the interrupt */
    Status = IoConnectInterrupt(&DeviceExtension->Interrupt,
                                PortFdoInterruptRoutine,
                                DeviceExtension,
                                NULL,
                                Vector,
                                Irql,
                                Irql,
                                InterruptMode,
                                ShareVector,
                                Affinity,
                                FALSE);
    if (NT_SUCCESS(Status))
    {
        DeviceExtension->InterruptIrql = Irql;
    }
    else
    {
        DPRINT1("IoConnectInterrupt() failed (Status 0x%08lx)\n", Status);
    }
 
    return Status;
}

Referenced by PortFdoStartMiniport().

PortFdoFilterRequirements()

static NTSTATUS PortFdoFilterRequirements ( PFDO_DEVICE_EXTENSION  DeviceExtension, PIRP  Irp  )

static

Definition at line 546 of file fdo.c.

{
    PIO_RESOURCE_REQUIREMENTS_LIST RequirementsList;
 
    DPRINT1("PortFdoFilterRequirements(%p %p)\n", DeviceExtension, Irp);
 
    /* Get the bus number and the slot number */
    RequirementsList =(PIO_RESOURCE_REQUIREMENTS_LIST)Irp->IoStatus.Information;
    if (RequirementsList != NULL)
    {
        DeviceExtension->BusNumber = RequirementsList->BusNumber;
        DeviceExtension->SlotNumber = RequirementsList->SlotNumber;
    }
 
    return STATUS_SUCCESS;
}

Referenced by PortFdoPnp().

PortFdoInterruptRoutine()

static BOOLEAN NTAPI PortFdoInterruptRoutine ( _In_ PKINTERRUPT  Interrupt, _In_ PVOID  ServiceContext  )

static

Definition at line 21 of file fdo.c.

{
    PFDO_DEVICE_EXTENSION DeviceExtension;
 
    DPRINT1("PortFdoInterruptRoutine(%p %p)\n",
            Interrupt, ServiceContext);
 
    DeviceExtension = (PFDO_DEVICE_EXTENSION)ServiceContext;
 
    return MiniportHwInterrupt(&DeviceExtension->Miniport);
}

Referenced by PortFdoConnectInterrupt().

PortFdoPnp()

NTSTATUS NTAPI PortFdoPnp	(	_In_ PDEVICE_OBJECT	DeviceObject,
		_In_ PIRP	Irp
	)

Definition at line 596 of file fdo.c.

{
    PFDO_DEVICE_EXTENSION DeviceExtension;
    PIO_STACK_LOCATION Stack;
    ULONG_PTR Information = 0;
    NTSTATUS Status = STATUS_NOT_SUPPORTED;
 
    DPRINT1("PortFdoPnp(%p %p)\n",
            DeviceObject, Irp);
 
    DeviceExtension = (PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
    ASSERT(DeviceExtension);
    ASSERT(DeviceExtension->ExtensionType == FdoExtension);
 
    Stack = IoGetCurrentIrpStackLocation(Irp);
 
    switch (Stack->MinorFunction)
    {
        case IRP_MN_START_DEVICE: /* 0x00 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_START_DEVICE\n");
            Status = PortFdoStartDevice(DeviceExtension, Irp);
            break;
 
        case IRP_MN_QUERY_REMOVE_DEVICE: /* 0x01 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_QUERY_REMOVE_DEVICE\n");
            break;
 
        case IRP_MN_REMOVE_DEVICE: /* 0x02 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_REMOVE_DEVICE\n");
            break;
 
        case IRP_MN_CANCEL_REMOVE_DEVICE: /* 0x03 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_CANCEL_REMOVE_DEVICE\n");
            break;
 
        case IRP_MN_STOP_DEVICE: /* 0x04 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_STOP_DEVICE\n");
            break;
 
        case IRP_MN_QUERY_STOP_DEVICE: /* 0x05 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_QUERY_STOP_DEVICE\n");
            break;
 
        case IRP_MN_CANCEL_STOP_DEVICE: /* 0x06 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_CANCEL_STOP_DEVICE\n");
            break;
 
        case IRP_MN_QUERY_DEVICE_RELATIONS: /* 0x07 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_QUERY_DEVICE_RELATIONS\n");
            switch (Stack->Parameters.QueryDeviceRelations.Type)
            {
                case BusRelations:
                    DPRINT1("    IRP_MJ_PNP / IRP_MN_QUERY_DEVICE_RELATIONS / BusRelations\n");
                    Status = PortFdoQueryBusRelations(DeviceExtension, &Information);
                    break;
 
                case RemovalRelations:
                    DPRINT1("    IRP_MJ_PNP / IRP_MN_QUERY_DEVICE_RELATIONS / RemovalRelations\n");
                    return ForwardIrpAndForget(DeviceExtension->LowerDevice, Irp);
 
                default:
                    DPRINT1("    IRP_MJ_PNP / IRP_MN_QUERY_DEVICE_RELATIONS / Unknown type 0x%lx\n",
                            Stack->Parameters.QueryDeviceRelations.Type);
                    return ForwardIrpAndForget(DeviceExtension->LowerDevice, Irp);
            }
            break;
 
        case IRP_MN_FILTER_RESOURCE_REQUIREMENTS: /* 0x0d */
            DPRINT1("IRP_MJ_PNP / IRP_MN_FILTER_RESOURCE_REQUIREMENTS\n");
            PortFdoFilterRequirements(DeviceExtension, Irp);
            return ForwardIrpAndForget(DeviceExtension->LowerDevice, Irp);
 
        case IRP_MN_QUERY_PNP_DEVICE_STATE: /* 0x14 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_QUERY_PNP_DEVICE_STATE\n");
            break;
 
        case IRP_MN_DEVICE_USAGE_NOTIFICATION: /* 0x16 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_DEVICE_USAGE_NOTIFICATION\n");
            break;
 
        case IRP_MN_SURPRISE_REMOVAL: /* 0x17 */
            DPRINT1("IRP_MJ_PNP / IRP_MN_SURPRISE_REMOVAL\n");
            break;
 
        default:
            DPRINT1("IRP_MJ_PNP / Unknown IOCTL 0x%lx\n", Stack->MinorFunction);
            return ForwardIrpAndForget(DeviceExtension->LowerDevice, Irp);
    }
 
    Irp->IoStatus.Information = Information;
    Irp->IoStatus.Status = Status;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
 
    return Status;
}

Referenced by PortDispatchPnp().

PortFdoQueryBusRelations()

static NTSTATUS PortFdoQueryBusRelations ( _In_ PFDO_DEVICE_EXTENSION  DeviceExtension, _Out_ PULONG_PTR  Information  )

static

Definition at line 525 of file fdo.c.

{
    NTSTATUS Status = STATUS_SUCCESS;;
 
    DPRINT1("PortFdoQueryBusRelations(%p %p)\n",
            DeviceExtension, Information);
 
    Status = PortFdoScanBus(DeviceExtension);
 
    DPRINT1("Units found: %lu\n", DeviceExtension->PdoCount);
 
    *Information = 0;
 
    return Status;
}

Referenced by PortFdoPnp().

PortFdoScanBus()

static NTSTATUS PortFdoScanBus ( _In_ PFDO_DEVICE_EXTENSION  DeviceExtension )

static

Definition at line 460 of file fdo.c.

{
    PPDO_DEVICE_EXTENSION PdoExtension;
    ULONG Bus, Target; //, Lun;
    NTSTATUS Status;
 
    DPRINT("PortFdoScanBus(%p)\n", DeviceExtension);
 
    DPRINT("NumberOfBuses: %lu\n", DeviceExtension->Miniport.PortConfig.NumberOfBuses);
    DPRINT("MaximumNumberOfTargets: %lu\n", DeviceExtension->Miniport.PortConfig.MaximumNumberOfTargets);
    DPRINT("MaximumNumberOfLogicalUnits: %lu\n", DeviceExtension->Miniport.PortConfig.MaximumNumberOfLogicalUnits);
 
    /* Scan all buses */
    for (Bus = 0; Bus < DeviceExtension->Miniport.PortConfig.NumberOfBuses; Bus++)
    {
        DPRINT("Scanning bus %ld\n", Bus);
 
        /* Scan all targets */
        for (Target = 0; Target < DeviceExtension->Miniport.PortConfig.MaximumNumberOfTargets; Target++)
        {
            DPRINT("  Scanning target %ld:%ld\n", Bus, Target);
 
            DPRINT("    Scanning logical unit %ld:%ld:%ld\n", Bus, Target, 0);
            Status = PortCreatePdo(DeviceExtension, Bus, Target, 0, &PdoExtension);
            if (NT_SUCCESS(Status))
            {
                /* Scan LUN 0 */
                Status = PortSendInquiry(PdoExtension);
                DPRINT("PortSendInquiry returned 0x%08lx\n", Status);
                if (!NT_SUCCESS(Status))
                {
                    PortDeletePdo(PdoExtension);
                }
                else
                {
                    DPRINT("VendorId: %.8s\n", PdoExtension->InquiryBuffer->VendorId);
                    DPRINT("ProductId: %.16s\n", PdoExtension->InquiryBuffer->ProductId);
                    DPRINT("ProductRevisionLevel: %.4s\n", PdoExtension->InquiryBuffer->ProductRevisionLevel);
                    DPRINT("VendorSpecific: %.20s\n", PdoExtension->InquiryBuffer->VendorSpecific);
                }
            }
 
#if 0
            /* Scan all logical units */
            for (Lun = 1; Lun < DeviceExtension->Miniport.PortConfig.MaximumNumberOfLogicalUnits; Lun++)
            {
                DPRINT("    Scanning logical unit %ld:%ld:%ld\n", Bus, Target, Lun);
                Status = PortSendInquiry(DeviceExtension->Device, Bus, Target, Lun);
                DPRINT("PortSendInquiry returned 0x%08lx\n", Status);
                if (!NT_SUCCESS(Status))
                    break;
            }
#endif
        }
    }
 
    DPRINT("PortFdoScanBus() done!\n");
 
    return STATUS_SUCCESS;
}

Referenced by PortFdoQueryBusRelations().

PortFdoScsi()

NTSTATUS NTAPI PortFdoScsi	(	_In_ PDEVICE_OBJECT	DeviceObject,
		_In_ PIRP	Irp
	)

Definition at line 568 of file fdo.c.

{
    PFDO_DEVICE_EXTENSION DeviceExtension;
//    PIO_STACK_LOCATION Stack;
    ULONG_PTR Information = 0;
    NTSTATUS Status = STATUS_NOT_SUPPORTED;
 
    DPRINT("PortFdoScsi(%p %p)\n", DeviceObject, Irp);
 
    DeviceExtension = (PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
    ASSERT(DeviceExtension);
    ASSERT(DeviceExtension->ExtensionType == FdoExtension);
 
//    Stack = IoGetCurrentIrpStackLocation(Irp);
 
 
    Irp->IoStatus.Information = Information;
    Irp->IoStatus.Status = Status;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
 
    return Status;
}

Referenced by PortDispatchScsi().

PortFdoStartDevice()

static NTSTATUS NTAPI PortFdoStartDevice ( _In_ PFDO_DEVICE_EXTENSION  DeviceExtension, _In_ PIRP  Irp  )

static

Definition at line 176 of file fdo.c.

{
    PIO_STACK_LOCATION Stack;
    NTSTATUS Status;
 
    DPRINT1("PortFdoStartDevice(%p %p)\n",
            DeviceExtension, Irp);
 
    ASSERT(DeviceExtension->ExtensionType == FdoExtension);
 
    /* Get the current stack location */
    Stack = IoGetCurrentIrpStackLocation(Irp);
 
    /* Start the lower device if the FDO is in 'stopped' state */
    if (DeviceExtension->PnpState == dsStopped)
    {
        if (IoForwardIrpSynchronously(DeviceExtension->LowerDevice, Irp))
        {
            Status = Irp->IoStatus.Status;
        }
        else
        {
            Status = STATUS_UNSUCCESSFUL;
        }
 
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("Lower device failed the IRP (Status 0x%08lx)\n", Status);
            return Status;
        }
    }
 
    /* Change to the 'started' state */
    DeviceExtension->PnpState = dsStarted;
 
    /* Copy the raw and translated resource lists into the device extension */
    if (Stack->Parameters.StartDevice.AllocatedResources != NULL &&
        Stack->Parameters.StartDevice.AllocatedResourcesTranslated != NULL)
    {
        DeviceExtension->AllocatedResources = CopyResourceList(NonPagedPool,
                                                               Stack->Parameters.StartDevice.AllocatedResources);
        if (DeviceExtension->AllocatedResources == NULL)
            return STATUS_NO_MEMORY;
 
        DeviceExtension->TranslatedResources = CopyResourceList(NonPagedPool,
                                                                Stack->Parameters.StartDevice.AllocatedResourcesTranslated);
        if (DeviceExtension->TranslatedResources == NULL)
            return STATUS_NO_MEMORY;
    }
 
    /* Get the bus interface of the lower (bus) device */
    Status = QueryBusInterface(DeviceExtension->LowerDevice,
                               (PGUID)&GUID_BUS_INTERFACE_STANDARD,
                               sizeof(BUS_INTERFACE_STANDARD),
                               1,
                               &DeviceExtension->BusInterface,
                               NULL);
    DPRINT1("Status: 0x%08lx\n", Status);
    if (NT_SUCCESS(Status))
    {
        DPRINT1("Context: %p\n", DeviceExtension->BusInterface.Context);
        DeviceExtension->BusInitialized = TRUE;
    }
 
    /* Start the miniport (FindAdapter & Initialize) */
    Status = PortFdoStartMiniport(DeviceExtension);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("FdoStartMiniport() failed (Status 0x%08lx)\n", Status);
        DeviceExtension->PnpState = dsStopped;
    }
 
    return Status;
}

Referenced by PortFdoPnp().

PortFdoStartMiniport()

static NTSTATUS PortFdoStartMiniport ( _In_ PFDO_DEVICE_EXTENSION  DeviceExtension )

static

Definition at line 104 of file fdo.c.

{
    PHW_INITIALIZATION_DATA InitData;
    INTERFACE_TYPE InterfaceType;
    NTSTATUS Status;
 
    DPRINT1("PortFdoStartDevice(%p)\n", DeviceExtension);
 
    /* Get the interface type of the lower device */
    InterfaceType = GetBusInterface(DeviceExtension->LowerDevice);
    if (InterfaceType == InterfaceTypeUndefined)
        return STATUS_NO_SUCH_DEVICE;
 
    /* Get the driver init data for the given interface type */
    InitData = PortGetDriverInitData(DeviceExtension->DriverExtension,
                                     InterfaceType);
    if (InitData == NULL)
        return STATUS_NO_SUCH_DEVICE;
 
    /* Initialize the miniport */
    Status = MiniportInitialize(&DeviceExtension->Miniport,
                                DeviceExtension,
                                InitData);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("MiniportInitialize() failed (Status 0x%08lx)\n", Status);
        return Status;
    }
 
    /* Call the miniports FindAdapter function */
    Status = MiniportFindAdapter(&DeviceExtension->Miniport);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("MiniportFindAdapter() failed (Status 0x%08lx)\n", Status);
        return Status;
    }
 
    /* Connect the configured interrupt */
    Status = PortFdoConnectInterrupt(DeviceExtension);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("PortFdoConnectInterrupt() failed (Status 0x%08lx)\n", Status);
        return Status;
    }
 
    /* Call the miniports HwInitialize function */
    Status = MiniportHwInitialize(&DeviceExtension->Miniport);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("MiniportHwInitialize() failed (Status 0x%08lx)\n", Status);
        return Status;
    }
 
    /* Call the HwPassiveInitRoutine function, if available */
    if (DeviceExtension->HwPassiveInitRoutine != NULL)
    {
        DPRINT1("Calling HwPassiveInitRoutine()\n");
        if (!DeviceExtension->HwPassiveInitRoutine(&DeviceExtension->Miniport.MiniportExtension->HwDeviceExtension))
        {
            DPRINT1("HwPassiveInitRoutine() failed\n");
            return STATUS_UNSUCCESSFUL;
        }
    }
 
    return STATUS_SUCCESS;
}

Referenced by PortFdoStartDevice().

PortSendInquiry()

static NTSTATUS PortSendInquiry ( _In_ PPDO_DEVICE_EXTENSION  PdoExtension )

static

Definition at line 256 of file fdo.c.

{
    IO_STATUS_BLOCK IoStatusBlock;
    PIO_STACK_LOCATION IrpStack;
    KEVENT Event;
//    KIRQL Irql;
    PIRP Irp;
    NTSTATUS Status;
    PSENSE_DATA SenseBuffer;
    BOOLEAN KeepTrying = TRUE;
    ULONG RetryCount = 0;
    SCSI_REQUEST_BLOCK Srb;
    PCDB Cdb;
//    PSCSI_PORT_LUN_EXTENSION LunExtension;
//    PFDO_DEVICE_EXTENSION DeviceExtension;
 
    DPRINT("PortSendInquiry(%p)\n", PdoExtension);
 
    if (PdoExtension->InquiryBuffer == NULL)
    {
        PdoExtension->InquiryBuffer = ExAllocatePoolWithTag(NonPagedPool, INQUIRYDATABUFFERSIZE, TAG_INQUIRY_DATA);
        if (PdoExtension->InquiryBuffer == NULL)
            return STATUS_INSUFFICIENT_RESOURCES;
    }
 
    SenseBuffer = ExAllocatePoolWithTag(NonPagedPool, SENSE_BUFFER_SIZE, TAG_SENSE_DATA);
    if (SenseBuffer == NULL)
    {
        return STATUS_INSUFFICIENT_RESOURCES;
    }
 
    while (KeepTrying)
    {
        /* Initialize event for waiting */
        KeInitializeEvent(&Event,
                          NotificationEvent,
                          FALSE);
 
        /* Create an IRP */
        Irp = IoBuildDeviceIoControlRequest(IOCTL_SCSI_EXECUTE_IN,
                                            PdoExtension->Device,
                                            NULL,
                                            0,
                                            PdoExtension->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 = PdoExtension->Bus;
        Srb.TargetId = PdoExtension->Target;
        Srb.Lun = PdoExtension->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 = PdoExtension->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 = PdoExtension->Lun;
        Cdb->CDB6INQUIRY.AllocationLength = INQUIRYDATABUFFERSIZE;
 
        /* Call the driver */
        Status = IoCallDriver(PdoExtension->Device, Irp);
 
        /* Wait for it to complete */
        if (Status == STATUS_PENDING)
        {
            DPRINT1("PortSendInquiry(): Waiting for the driver to process request...\n");
            KeWaitForSingleObject(&Event,
                                  Executive,
                                  KernelMode,
                                  FALSE,
                                  NULL);
            Status = IoStatusBlock.Status;
        }
 
        DPRINT("PortSendInquiry(): Request processed by driver, status = 0x%08X\n", Status);
 
        if (SRB_STATUS(Srb.SrbStatus) == SRB_STATUS_SUCCESS)
        {
            DPRINT("Found a device!\n");
 
            /* 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", PdoExtension->Target);
 
            /* 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 the sense buffer */
    ExFreePoolWithTag(SenseBuffer, TAG_SENSE_DATA);
 
    DPRINT("PortSendInquiry() done with Status 0x%08X\n", Status);
 
    return Status;
}

Referenced by PortFdoScanBus().