device.h File Reference

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Macros
#define	TAG_GDEV   'gdev'

Functions
VOID NTAPI	PDEVOBJ_vRefreshModeList (PPDEVOBJ ppdev)
VOID APIENTRY	EngFileWrite (_In_ PFILE_OBJECT pFileObject, _In_reads_(nLength) PVOID lpBuffer, _In_ SIZE_T nLength, _Out_ PSIZE_T lpBytesWritten)
NTSTATUS NTAPI	EngpUpdateMonitorDevices (_In_ PGRAPHICS_DEVICE pGraphicsDevice)
PGRAPHICS_DEVICE NTAPI	EngpFindGraphicsDevice (_In_opt_ PUNICODE_STRING pustrDevice, _In_ ULONG iDevNum)
PGRAPHICS_DEVICE NTAPI	EngpRegisterGraphicsDevice (_In_ PUNICODE_STRING pustrDeviceName, _In_ PUNICODE_STRING pustrDiplayDrivers, _In_ PUNICODE_STRING pustrDescription)
NTSTATUS	EngpUpdateGraphicsDeviceList (VOID)
NTSTATUS	EngpGetDisplayDriverParameters (_In_ PGRAPHICS_DEVICE pGraphicsDevice, _Out_ PDEVMODEW pdm)
DWORD	EngpGetDisplayDriverAccelerationLevel (_In_ PGRAPHICS_DEVICE pGraphicsDevice)
NTSTATUS NTAPI	InitDeviceImpl (VOID)

Macro Definition Documentation

TAG_GDEV

#define TAG_GDEV   'gdev'

Definition at line 4 of file device.h.

Function Documentation

EngFileWrite()

VOID APIENTRY EngFileWrite	(	_In_ PFILE_OBJECT	pFileObject,
		_In_reads_(nLength) PVOID	lpBuffer,
		_In_ SIZE_T	nLength,
		_Out_ PSIZE_T	lpBytesWritten
	)

Definition at line 908 of file device.c.

{
    NTSTATUS status;
 
    status = EngpFileIoRequest(pFileObject,
                               IRP_MJ_WRITE,
                               lpBuffer,
                               nLength,
                               0,
                               lpBytesWritten);
    if (!NT_SUCCESS(status))
    {
        *lpBytesWritten = 0;
    }
}

EngpFindGraphicsDevice()

PGRAPHICS_DEVICE NTAPI EngpFindGraphicsDevice	(	_In_opt_ PUNICODE_STRING	pustrDevice,
		_In_ ULONG	iDevNum
	)

Definition at line 795 of file device.c.

{
    UNICODE_STRING ustrCurrent;
    PGRAPHICS_DEVICE pGraphicsDevice;
    ULONG i;
    TRACE("EngpFindGraphicsDevice('%wZ', %lu)\n",
           pustrDevice, iDevNum);
 
    /* Lock list */
    EngAcquireSemaphore(ghsemGraphicsDeviceList);
 
    if (pustrDevice && pustrDevice->Buffer)
    {
        /* Find specified video adapter by name */
        for (pGraphicsDevice = gpGraphicsDeviceFirst;
             pGraphicsDevice;
             pGraphicsDevice = pGraphicsDevice->pNextGraphicsDevice)
        {
            /* Compare the device name */
            RtlInitUnicodeString(&ustrCurrent, pGraphicsDevice->szWinDeviceName);
            if (RtlEqualUnicodeString(&ustrCurrent, pustrDevice, FALSE))
            {
                break;
            }
        }
 
        if (pGraphicsDevice)
        {
            /* Validate selected monitor number */
#if 0
            if (iDevNum >= pGraphicsDevice->dwMonCnt)
                pGraphicsDevice = NULL;
#else
            /* FIXME: dwMonCnt not initialized, see EngpRegisterGraphicsDevice */
#endif
        }
    }
    else
    {
        /* Select video adapter by device number */
        for (pGraphicsDevice = gpGraphicsDeviceFirst, i = 0;
             pGraphicsDevice && i < iDevNum;
             pGraphicsDevice = pGraphicsDevice->pNextGraphicsDevice, i++);
    }
 
    /* Unlock list */
    EngReleaseSemaphore(ghsemGraphicsDeviceList);
 
    return pGraphicsDevice;
}

Referenced by co_IntInitializeDesktopGraphics(), EngpUpdateGraphicsDeviceList(), MDEVOBJ_Create(), PDEVOBJ_lChangeDisplaySettings(), UserEnumDisplayDevices(), and UserEnumDisplaySettings().

EngpGetDisplayDriverAccelerationLevel()

DWORD EngpGetDisplayDriverAccelerationLevel

(

_In_ PGRAPHICS_DEVICE

pGraphicsDevice

)

Definition at line 420 of file device.c.

{
    HKEY hKey;
    DWORD dwAccelerationLevel = 0;
    RTL_QUERY_REGISTRY_TABLE DisplaySettingsTable[] =
    {
        {
            NULL,
            RTL_QUERY_REGISTRY_DIRECT,
            L"Acceleration.Level",
            &dwAccelerationLevel,
            REG_NONE, NULL, 0
        },
        {0}
    };
 
    hKey = EngpGetRegistryHandleFromDeviceMap(pGraphicsDevice);
    if (!hKey)
        return 0;
 
    RtlQueryRegistryValues(RTL_REGISTRY_HANDLE,
                           (PWSTR)hKey,
                           DisplaySettingsTable,
                           NULL,
                           NULL);
    ZwClose(hKey);
 
    return dwAccelerationLevel;
}

Referenced by MDEVOBJ_Create().

EngpGetDisplayDriverParameters()

NTSTATUS EngpGetDisplayDriverParameters	(	_In_ PGRAPHICS_DEVICE	pGraphicsDevice,
		_Out_ PDEVMODEW	pdm
	)

Definition at line 374 of file device.c.

{
    HKEY hKey;
    NTSTATUS Status;
    RTL_QUERY_REGISTRY_TABLE DisplaySettingsTable[] =
    {
#define READ(field, str) \
        { \
            NULL, \
            RTL_QUERY_REGISTRY_DIRECT, \
            L ##str, \
            &pdm->field, \
            REG_NONE, NULL, 0 \
        },
    READ(dmBitsPerPel, "DefaultSettings.BitsPerPel")
    READ(dmPelsWidth, "DefaultSettings.XResolution")
    READ(dmPelsHeight, "DefaultSettings.YResolution")
    READ(dmDisplayFlags, "DefaultSettings.Flags")
    READ(dmDisplayFrequency, "DefaultSettings.VRefresh")
    READ(dmPanningWidth, "DefaultSettings.XPanning")
    READ(dmPanningHeight, "DefaultSettings.YPanning")
    READ(dmDisplayOrientation, "DefaultSettings.Orientation")
    READ(dmDisplayFixedOutput, "DefaultSettings.FixedOutput")
    READ(dmPosition.x, "Attach.RelativeX")
    READ(dmPosition.y, "Attach.RelativeY")
#undef READ
        {0}
    };
 
    hKey = EngpGetRegistryHandleFromDeviceMap(pGraphicsDevice);
    if (!hKey)
        return STATUS_UNSUCCESSFUL;
 
    Status = RtlQueryRegistryValues(RTL_REGISTRY_HANDLE,
                                    (PWSTR)hKey,
                                    DisplaySettingsTable,
                                    NULL,
                                    NULL);
 
    ZwClose(hKey);
    return Status;
}

Referenced by LDEVOBJ_bProbeAndCaptureDevmode().

EngpRegisterGraphicsDevice()

PGRAPHICS_DEVICE NTAPI EngpRegisterGraphicsDevice	(	_In_ PUNICODE_STRING	pustrDeviceName,
		_In_ PUNICODE_STRING	pustrDiplayDrivers,
		_In_ PUNICODE_STRING	pustrDescription
	)

Definition at line 662 of file device.c.

{
    PGRAPHICS_DEVICE pGraphicsDevice;
    PDEVICE_OBJECT pDeviceObject;
    PFILE_OBJECT pFileObject;
    NTSTATUS Status;
    VIDEO_WIN32K_CALLBACKS Win32kCallbacks;
    ULONG ulReturn;
    PWSTR pwsz;
    ULONG cj;
 
    TRACE("EngpRegisterGraphicsDevice(%wZ)\n", pustrDeviceName);
 
    /* Allocate a GRAPHICS_DEVICE structure */
    pGraphicsDevice = ExAllocatePoolZero(PagedPool,
                                         sizeof(GRAPHICS_DEVICE),
                                         GDITAG_GDEVICE);
    if (!pGraphicsDevice)
    {
        ERR("ExAllocatePoolWithTag failed\n");
        return NULL;
    }
 
    /* Try to open and enable the device */
    Status = IoGetDeviceObjectPointer(pustrDeviceName,
                                      FILE_READ_DATA | FILE_WRITE_DATA,
                                      &pFileObject,
                                      &pDeviceObject);
    if (!NT_SUCCESS(Status))
    {
        ERR("Could not open device %wZ, 0x%lx\n", pustrDeviceName, Status);
        ExFreePoolWithTag(pGraphicsDevice, GDITAG_GDEVICE);
        return NULL;
    }
 
    /* Copy the device and file object pointers */
    pGraphicsDevice->DeviceObject = pDeviceObject;
    pGraphicsDevice->FileObject = pFileObject;
 
    /* Initialize and register the device with videoprt for Win32k callbacks */
    Win32kCallbacks.PhysDisp = pGraphicsDevice;
    Win32kCallbacks.Callout = VideoPortCallout;
    // Reset the data being returned prior to the call.
    Win32kCallbacks.bACPI = FALSE;
    Win32kCallbacks.pPhysDeviceObject = NULL;
    Win32kCallbacks.DualviewFlags = 0;
    Status = (NTSTATUS)EngDeviceIoControl((HANDLE)pDeviceObject,
                                          IOCTL_VIDEO_INIT_WIN32K_CALLBACKS,
                                          &Win32kCallbacks,
                                          sizeof(Win32kCallbacks),
                                          &Win32kCallbacks,
                                          sizeof(Win32kCallbacks),
                                          &ulReturn);
    if (Status != ERROR_SUCCESS)
    {
        ERR("EngDeviceIoControl(0x%p, IOCTL_VIDEO_INIT_WIN32K_CALLBACKS) failed, Status 0x%lx\n",
            pDeviceObject, Status);
    }
    // TODO: Set flags according to the results.
    // if (Win32kCallbacks.bACPI)
    // if (Win32kCallbacks.DualviewFlags & ???)
    pGraphicsDevice->PhysDeviceHandle = Win32kCallbacks.pPhysDeviceObject;
 
    /* Copy the device name */
    RtlStringCbCopyNW(pGraphicsDevice->szNtDeviceName,
                      sizeof(pGraphicsDevice->szNtDeviceName),
                      pustrDeviceName->Buffer,
                      pustrDeviceName->Length);
 
    /* Create a Win32 device name (FIXME: virtual devices!) */
    RtlStringCbPrintfW(pGraphicsDevice->szWinDeviceName,
                       sizeof(pGraphicsDevice->szWinDeviceName),
                       L"\\\\.\\DISPLAY%d",
                       (int)giDevNum);
 
    /* Allocate a buffer for the strings */
    cj = pustrDiplayDrivers->Length + pustrDescription->Length + sizeof(WCHAR);
    pwsz = ExAllocatePoolWithTag(PagedPool, cj, GDITAG_DRVSUP);
    if (!pwsz)
    {
        ERR("Could not allocate string buffer\n");
        ASSERT(FALSE); // FIXME
        ExFreePoolWithTag(pGraphicsDevice, GDITAG_GDEVICE);
        return NULL;
    }
 
    /* Copy the display driver names */
    pGraphicsDevice->pDiplayDrivers = pwsz;
    RtlCopyMemory(pGraphicsDevice->pDiplayDrivers,
                  pustrDiplayDrivers->Buffer,
                  pustrDiplayDrivers->Length);
 
    /* Copy the description */
    pGraphicsDevice->pwszDescription = pwsz + pustrDiplayDrivers->Length / sizeof(WCHAR);
    RtlCopyMemory(pGraphicsDevice->pwszDescription,
                  pustrDescription->Buffer,
                  pustrDescription->Length);
    pGraphicsDevice->pwszDescription[pustrDescription->Length/sizeof(WCHAR)] = 0;
 
    /* Update list of connected monitors */
    EngpUpdateMonitorDevices(pGraphicsDevice);
 
    /* Lock loader */
    EngAcquireSemaphore(ghsemGraphicsDeviceList);
 
    /* Insert the device into the global list */
    EngpLinkGraphicsDevice(pGraphicsDevice);
 
    /* Increment the device number */
    giDevNum++;
 
    /* Unlock loader */
    EngReleaseSemaphore(ghsemGraphicsDeviceList);
 
    /* HACK: already in graphic mode; display wallpaper on this new display */
    if (ScreenDeviceContext)
    {
        UNICODE_STRING DriverName = RTL_CONSTANT_STRING(L"DISPLAY");
        UNICODE_STRING DisplayName;
        HDC hdc;
        RtlInitUnicodeString(&DisplayName, pGraphicsDevice->szWinDeviceName);
        hdc = IntGdiCreateDC(&DriverName, &DisplayName, NULL, NULL, FALSE);
        IntPaintDesktop(hdc);
    }
 
    return pGraphicsDevice;
}

Referenced by InitDisplayDriver().

EngpUpdateGraphicsDeviceList()

NTSTATUS EngpUpdateGraphicsDeviceList

(

VOID

)

Definition at line 182 of file device.c.

{
    ULONG iDevNum, ulMaxObjectNumber = 0;
    WCHAR awcDeviceName[20], awcWinDeviceName[20];
    UNICODE_STRING ustrDeviceName;
    WCHAR awcBuffer[256];
    NTSTATUS Status;
    PGRAPHICS_DEVICE pGraphicsDevice, pNewPrimaryGraphicsDevice = NULL;
    ULONG cbValue;
    HKEY hkey;
 
    /* Open the key for the adapters */
    Status = RegOpenKey(L"\\Registry\\Machine\\HARDWARE\\DEVICEMAP\\VIDEO", &hkey);
    if (!NT_SUCCESS(Status))
    {
        ERR("Could not open HARDWARE\\DEVICEMAP\\VIDEO registry key:0x%lx\n", Status);
        return Status;
    }
 
    /* Get the maximum number of adapters */
    if (!RegReadDWORD(hkey, L"MaxObjectNumber", &ulMaxObjectNumber))
    {
        ERR("Could not read MaxObjectNumber, defaulting to 0.\n");
    }
 
    TRACE("Found %lu devices\n", ulMaxObjectNumber + 1);
 
    /* Loop through all adapters, to detect new ones */
    for (iDevNum = 0; iDevNum <= ulMaxObjectNumber; iDevNum++)
    {
        /* Create the adapter's key name */
        swprintf(awcDeviceName, L"\\Device\\Video%lu", iDevNum);
 
        /* Create the display device name */
        swprintf(awcWinDeviceName, L"\\\\.\\DISPLAY%lu", iDevNum + 1);
        RtlInitUnicodeString(&ustrDeviceName, awcWinDeviceName);
 
        /* Check if the device exists already */
        pGraphicsDevice = EngpFindGraphicsDevice(&ustrDeviceName, iDevNum);
        if (pGraphicsDevice != NULL)
        {
            continue;
        }
 
        /* Read the reg key name */
        cbValue = sizeof(awcBuffer);
        Status = RegQueryValue(hkey, awcDeviceName, REG_SZ, awcBuffer, &cbValue);
        if (!NT_SUCCESS(Status))
        {
            ERR("failed to query the registry path:0x%lx\n", Status);
            continue;
        }
 
        /* Initialize the driver for this device */
        pGraphicsDevice = InitDisplayDriver(awcDeviceName, awcBuffer);
        if (!pGraphicsDevice) continue;
    }
 
    /* Close the device map registry key */
    ZwClose(hkey);
 
    /* Choose a VGA device */
    /* Try a device with DISPLAY_DEVICE_VGA_COMPATIBLE flag. If not found,
     * fall back to current VGA device */
    for (pGraphicsDevice = gpGraphicsDeviceFirst;
         pGraphicsDevice;
         pGraphicsDevice = pGraphicsDevice->pNextGraphicsDevice)
    {
        if (pGraphicsDevice == gpVgaGraphicsDevice)
            continue;
        if (pGraphicsDevice->StateFlags & DISPLAY_DEVICE_VGA_COMPATIBLE && EngpHasVgaDriver(pGraphicsDevice))
        {
            gpVgaGraphicsDevice = pGraphicsDevice;
            break;
        }
    }
 
    /* Handle gbBaseVideo */
    if (gbBaseVideo)
    {
        PGRAPHICS_DEVICE pToDelete;
 
        /* Lock list */
        EngAcquireSemaphore(ghsemGraphicsDeviceList);
 
        /* Remove every device from linked list, except base-video one */
        pGraphicsDevice = gpGraphicsDeviceFirst;
        while (pGraphicsDevice)
        {
            if (!EngpHasVgaDriver(pGraphicsDevice))
            {
                /* Not base-video device. Remove it */
                pToDelete = pGraphicsDevice;
                TRACE("Removing non-base-video device %S (%S)\n", pToDelete->szWinDeviceName, pToDelete->szNtDeviceName);
 
                EngpUnlinkGraphicsDevice(pGraphicsDevice);
                pGraphicsDevice = pGraphicsDevice->pNextGraphicsDevice;
 
                /* Free memory */
                ExFreePoolWithTag(pToDelete->pDiplayDrivers, GDITAG_DRVSUP);
                ExFreePoolWithTag(pToDelete, GDITAG_GDEVICE);
            }
            else
            {
                pGraphicsDevice = pGraphicsDevice->pNextGraphicsDevice;
            }
        }
 
        /* Unlock list */
        EngReleaseSemaphore(ghsemGraphicsDeviceList);
    }
 
    /* Choose a primary device (if none already exists) */
    if (!gpPrimaryGraphicsDevice)
    {
        for (pGraphicsDevice = gpGraphicsDeviceFirst;
             pGraphicsDevice;
             pGraphicsDevice = pGraphicsDevice->pNextGraphicsDevice)
        {
            if (!EngpHasVgaDriver(pGraphicsDevice))
            {
                pNewPrimaryGraphicsDevice = pGraphicsDevice;
                break;
            }
        }
        if (!pNewPrimaryGraphicsDevice)
            pNewPrimaryGraphicsDevice = gpGraphicsDeviceFirst;
        if (pNewPrimaryGraphicsDevice)
        {
            pNewPrimaryGraphicsDevice->StateFlags |= DISPLAY_DEVICE_PRIMARY_DEVICE;
            gpPrimaryGraphicsDevice = pNewPrimaryGraphicsDevice;
        }
    }
 
    /* Can we link VGA device to primary device? */
    if (gpPrimaryGraphicsDevice &&
        gpVgaGraphicsDevice &&
        gpPrimaryGraphicsDevice != gpVgaGraphicsDevice &&
        !gpPrimaryGraphicsDevice->pVgaDevice)
    {
        /* Yes. Remove VGA device from global list, and attach it to primary device */
        TRACE("Linking VGA device %S to primary device %S\n", gpVgaGraphicsDevice->szNtDeviceName, gpPrimaryGraphicsDevice->szNtDeviceName);
        EngAcquireSemaphore(ghsemGraphicsDeviceList);
        EngpUnlinkGraphicsDevice(gpVgaGraphicsDevice);
        gpPrimaryGraphicsDevice->pVgaDevice = gpVgaGraphicsDevice;
        EngReleaseSemaphore(ghsemGraphicsDeviceList);
    }
 
    return STATUS_SUCCESS;
}

Referenced by co_IntInitializeDesktopGraphics(), InitVideo(), and UserEnumDisplayDevices().

EngpUpdateMonitorDevices()

NTSTATUS NTAPI EngpUpdateMonitorDevices

(

_In_ PGRAPHICS_DEVICE

pGraphicsDevice

)

Definition at line 568 of file device.c.

{
    PDEVICE_RELATIONS pDeviceRelations;
    PVIDEO_MONITOR_DEVICE pMonitorDevices;
    ULONG i, bytesWritten, monitorCount;
    NTSTATUS Status;
    HANDLE hkRegistry;
 
    /* Request right PDO for device relations */
    Status = EngpPnPTargetRelationRequest(pGraphicsDevice->DeviceObject, &pDeviceRelations);
    if (!NT_SUCCESS(Status))
    {
        ERR("EngpPnPTargetRelationRequest() failed with status 0x%08x\n", Status);
        return Status;
    }
    ASSERT(pDeviceRelations->Count == 1);
 
    /* Invalidate relations, so that videoprt reenumerates its monitors.
     * Only do this for valid PDOs - check by trying to open registry key. */
    Status = IoOpenDeviceRegistryKey(pDeviceRelations->Objects[0],
                                     PLUGPLAY_REGKEY_DRIVER,
                                     KEY_READ,
                                     &hkRegistry);
    if (NT_SUCCESS(Status))
    {
        ZwClose(hkRegistry);
        IoSynchronousInvalidateDeviceRelations(pDeviceRelations->Objects[0], BusRelations);
    }
    else
    {
        /* Legacy device without valid PDO - skip invalidation.
         * This is expected for non-PnP devices like VGA. */
    }
 
    /* Free returned structure */
    for (i = 0; i < pDeviceRelations->Count; i++)
        ObDereferenceObject(pDeviceRelations->Objects[i]);
    ExFreePool(pDeviceRelations);
 
    /* Now, get list of monitor PDOs */
    Status = EngDeviceIoControl(pGraphicsDevice->DeviceObject,
                                IOCTL_VIDEO_ENUM_MONITOR_PDO,
                                NULL, 0,
                                &pMonitorDevices, sizeof(pMonitorDevices),
                                &bytesWritten);
    if (Status != ERROR_SUCCESS)
    {
        ERR("EngDeviceIoControl(IOCTL_VIDEO_ENUM_MONITOR_PDO) failed with status 0x%08x\n", Status);
        return Status;
    }
    ASSERT(bytesWritten == sizeof(pMonitorDevices));
 
    /* Count number of available monitors */
    for (monitorCount = 0; pMonitorDevices[monitorCount].pdo; ++monitorCount)
        ;
 
    if (pGraphicsDevice->pvMonDev)
    {
        /* Erase everything */
        for (i = 0; i < pGraphicsDevice->dwMonCnt; i++)
            ObDereferenceObject(pGraphicsDevice->pvMonDev[i].pdo);
        ExFreePoolWithTag(pGraphicsDevice->pvMonDev, GDITAG_GDEVICE);
        pGraphicsDevice->pvMonDev = NULL;
        pGraphicsDevice->dwMonCnt = 0;
    }
 
    if (monitorCount > 0)
    {
        pGraphicsDevice->pvMonDev = ExAllocatePoolZero(PagedPool,
                                                       monitorCount * sizeof(VIDEO_MONITOR_DEVICE),
                                                       GDITAG_GDEVICE);
        if (!pGraphicsDevice->pvMonDev)
        {
            for (i = 0; pMonitorDevices[i].pdo; ++i)
                ObDereferenceObject(pMonitorDevices[i].pdo);
            ExFreePool(pMonitorDevices);
            return STATUS_INSUFFICIENT_RESOURCES;
        }
 
        /* Copy data */
        for (i = 0; i < monitorCount; i++)
        {
            TRACE("%S\\Monitor%u: PDO %p HwID %u\n", pGraphicsDevice->szWinDeviceName, i, pMonitorDevices[i].pdo, pMonitorDevices[i].HwID);
            pGraphicsDevice->pvMonDev[pGraphicsDevice->dwMonCnt++] = pMonitorDevices[i];
        }
    }
 
    ExFreePool(pMonitorDevices);
    return STATUS_SUCCESS;
}

Referenced by EngpRegisterGraphicsDevice(), and UserEnumDisplayDevices().

InitDeviceImpl()

NTSTATUS NTAPI InitDeviceImpl

(

VOID

)

Definition at line 26 of file device.c.

{
    ghsemGraphicsDeviceList = EngCreateSemaphore();
    if (!ghsemGraphicsDeviceList)
        return STATUS_INSUFFICIENT_RESOURCES;
 
    return STATUS_SUCCESS;
}

Referenced by DriverEntry().

PDEVOBJ_vRefreshModeList()

VOID NTAPI PDEVOBJ_vRefreshModeList

(

PPDEVOBJ

ppdev

)

Definition at line 432 of file pdevobj.c.

{
    PGRAPHICS_DEVICE pGraphicsDevice;
    PDEVMODEINFO pdminfo, pdmiNext;
 
    /* Lock the PDEV */
    EngAcquireSemaphore(ppdev->hsemDevLock);
 
    pGraphicsDevice = ppdev->pGraphicsDevice;
 
    /* Clear out the modes */
    for (pdminfo = pGraphicsDevice->pdevmodeInfo;
         pdminfo;
         pdminfo = pdmiNext)
    {
        pdmiNext = pdminfo->pdmiNext;
        ExFreePoolWithTag(pdminfo, GDITAG_DEVMODE);
    }
    pGraphicsDevice->pdevmodeInfo = NULL;
    ExFreePoolWithTag(pGraphicsDevice->pDevModeList, GDITAG_GDEVICE);
    pGraphicsDevice->pDevModeList = NULL;
 
    /* Update available display mode list */
    LDEVOBJ_bBuildDevmodeList(pGraphicsDevice);
 
    /* Unlock PDEV */
    EngReleaseSemaphore(ppdev->hsemDevLock);
}

Referenced by UserEnumDisplaySettings().