reactos/drivers/parallel/parport/misc.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: Parallel Port Function Driver
* FILE: drivers/parallel/parport/misc.c
* PURPOSE: Miscellaneous functions
*/
#include "parport.h"
static IO_COMPLETION_ROUTINE ForwardIrpAndWaitCompletion;
/* FUNCTIONS ****************************************************************/
static
NTSTATUS
NTAPI
ForwardIrpAndWaitCompletion(IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID Context)
{
if (Irp->PendingReturned)
KeSetEvent((PKEVENT)Context, IO_NO_INCREMENT, FALSE);
return STATUS_MORE_PROCESSING_REQUIRED;
}
NTSTATUS
ForwardIrpAndWait(IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp)
{
PDEVICE_OBJECT LowerDevice;
KEVENT Event;
NTSTATUS Status;
LowerDevice = ((PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->LowerDevice;
ASSERT(LowerDevice);
KeInitializeEvent(&Event, NotificationEvent, FALSE);
IoCopyCurrentIrpStackLocationToNext(Irp);
DPRINT("Calling lower device %p\n", LowerDevice);
IoSetCompletionRoutine(Irp, ForwardIrpAndWaitCompletion, &Event, TRUE, TRUE, TRUE);
Status = IoCallDriver(LowerDevice, Irp);
if (Status == STATUS_PENDING)
{
Status = KeWaitForSingleObject(&Event, Suspended, KernelMode, FALSE, NULL);
if (NT_SUCCESS(Status))
Status = Irp->IoStatus.Status;
}
return Status;
}
NTSTATUS
NTAPI
ForwardIrpAndForget(IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp)
{
PDEVICE_OBJECT LowerDevice;
if (((PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->Common.IsFDO)
LowerDevice = ((PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->LowerDevice;
else
LowerDevice = ((PPDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->AttachedFdo;
ASSERT(LowerDevice);
IoSkipCurrentIrpStackLocation(Irp);
return IoCallDriver(LowerDevice, Irp);
}
PVOID
GetUserBuffer(IN PIRP Irp)
{
ASSERT(Irp);
if (Irp->MdlAddress)
return Irp->MdlAddress;
else
return Irp->AssociatedIrp.SystemBuffer;
}
/* EOF */