mmc.c File Reference

#include "stddef.h"
#include "string.h"
#include "ntddk.h"
#include "ntddstor.h"
#include "cdrom.h"
#include "mmc.h"
#include "scratch.h"

Include dependency graph for mmc.c:

Go to the source code of this file.

Functions
	_IRQL_requires_max_ (APC_LEVEL)
	_IRQL_requires_max_ (PASSIVE_LEVEL)

Function Documentation

_IRQL_requires_max_() [1/2]

_IRQL_requires_max_

(

APC_LEVEL

)

Definition at line 56 of file mmc.c.

{
    PCDROM_DEVICE_EXTENSION deviceExtension = DeviceGetExtension(Device);
    PCDROM_DATA             cddata = &(deviceExtension->DeviceAdditionalData);
    PCDROM_MMC_EXTENSION    mmcData = &cddata->Mmc;

    PAGED_CODE();

    if (mmcData->CapabilitiesIrp)
    {
        IoFreeIrp(mmcData->CapabilitiesIrp);
        mmcData->CapabilitiesIrp = NULL;
    }
    if (mmcData->CapabilitiesMdl)
    {
        IoFreeMdl(mmcData->CapabilitiesMdl);
        mmcData->CapabilitiesMdl = NULL;
    }
    if (mmcData->CapabilitiesBuffer)
    {
        ExFreePool(mmcData->CapabilitiesBuffer);
        mmcData->CapabilitiesBuffer = NULL;
    }
    if (mmcData->CapabilitiesRequest)
    {
        WdfObjectDelete(mmcData->CapabilitiesRequest);
        mmcData->CapabilitiesRequest = NULL;
    }
    mmcData->CapabilitiesBufferSize = 0;
    mmcData->IsMmc = FALSE;
    mmcData->WriteAllowed = FALSE;

    return;
}

_IRQL_requires_max_() [2/2]

_IRQL_requires_max_

(

PASSIVE_LEVEL

)

Definition at line 111 of file mmc.c.

{
    NTSTATUS status                         = STATUS_SUCCESS;
    PCDROM_DEVICE_EXTENSION deviceExtension = DeviceGetExtension(Device);
    PCDROM_DATA cddata                      = &(deviceExtension->DeviceAdditionalData);
    PCDROM_MMC_EXTENSION mmcData            = &(cddata->Mmc);
    WDF_OBJECT_ATTRIBUTES attributes        = {0};

    PAGED_CODE();

    NT_ASSERT(mmcData->CapabilitiesBuffer == NULL);
    NT_ASSERT(mmcData->CapabilitiesBufferSize == 0);

    // allocate the buffer and set the buffer size.
    // retrieve drive configuration information.
    status = DeviceGetConfigurationWithAlloc(Device,
                                             &mmcData->CapabilitiesBuffer,
                                             &mmcData->CapabilitiesBufferSize,
                                             FeatureProfileList,
                                             SCSI_GET_CONFIGURATION_REQUEST_TYPE_ALL);
    if (!NT_SUCCESS(status))
    {
        NT_ASSERT(mmcData->CapabilitiesBuffer     == NULL);
        NT_ASSERT(mmcData->CapabilitiesBufferSize == 0);
        return status;
    }

    NT_ASSERT(mmcData->CapabilitiesBuffer     != NULL);
    NT_ASSERT(mmcData->CapabilitiesBufferSize != 0);

    // Create an MDL over the new Buffer (allocated by DeviceGetConfiguration)
    mmcData->CapabilitiesMdl = IoAllocateMdl(mmcData->CapabilitiesBuffer,
                                             mmcData->CapabilitiesBufferSize,
                                             FALSE, FALSE, NULL);
    if (mmcData->CapabilitiesMdl == NULL)
    {
        ExFreePool(mmcData->CapabilitiesBuffer);
        mmcData->CapabilitiesBuffer = NULL;
        mmcData->CapabilitiesBufferSize = 0;
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    // Create an IRP from which we will create a WDFREQUEST
    mmcData->CapabilitiesIrp = IoAllocateIrp(deviceExtension->DeviceObject->StackSize + 1, FALSE);
    if (mmcData->CapabilitiesIrp == NULL)
    {
        IoFreeMdl(mmcData->CapabilitiesMdl);
        mmcData->CapabilitiesMdl = NULL;
        ExFreePool(mmcData->CapabilitiesBuffer);
        mmcData->CapabilitiesBuffer = NULL;
        mmcData->CapabilitiesBufferSize = 0;
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    // create WDF request object
    WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&attributes,
                                            CDROM_REQUEST_CONTEXT);
    status = WdfRequestCreateFromIrp(&attributes,
                                     mmcData->CapabilitiesIrp,
                                     FALSE,
                                     &mmcData->CapabilitiesRequest);
    if (!NT_SUCCESS(status))
    {
        return status;
    }

    return STATUS_SUCCESS;
}