mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
1.8 KiB
64 lines
1.8 KiB
#include "pch.h"
|
|
|
|
NTSTATUS
|
|
PptFdoClose(
|
|
IN PDEVICE_OBJECT DeviceObject,
|
|
IN PIRP Irp
|
|
)
|
|
{
|
|
PFDO_EXTENSION fdx = DeviceObject->DeviceExtension;
|
|
NTSTATUS status;
|
|
|
|
PAGED_CODE();
|
|
|
|
//
|
|
// Verify that our device has not been SUPRISE_REMOVED. Generally
|
|
// only parallel ports on hot-plug busses (e.g., PCMCIA) and
|
|
// parallel ports in docking stations will be surprise removed.
|
|
//
|
|
if( fdx->PnpState & PPT_DEVICE_SURPRISE_REMOVED ) {
|
|
//
|
|
// Our device has been SURPRISE removed, but since this is only
|
|
// a CLOSE, SUCCEED anyway.
|
|
//
|
|
status = P4CompleteRequest( Irp, STATUS_SUCCESS, 0 );
|
|
|
|
goto target_exit;
|
|
}
|
|
|
|
|
|
//
|
|
// Try to acquire RemoveLock to prevent the device object from going
|
|
// away while we're using it.
|
|
//
|
|
status = PptAcquireRemoveLock(&fdx->RemoveLock, Irp);
|
|
if( !NT_SUCCESS( status ) ) {
|
|
// Our device has been removed, but since this is only a CLOSE, SUCCEED anyway.
|
|
status = STATUS_SUCCESS;
|
|
goto target_exit;
|
|
}
|
|
|
|
//
|
|
// We have the RemoveLock
|
|
//
|
|
|
|
ExAcquireFastMutex(&fdx->OpenCloseMutex);
|
|
if( fdx->OpenCloseRefCount > 0 ) {
|
|
//
|
|
// prevent rollover - strange as it may seem, it is perfectly
|
|
// legal for us to receive more closes than creates - this
|
|
// info came directly from Mr. PnP himself
|
|
//
|
|
if( ((LONG)InterlockedDecrement(&fdx->OpenCloseRefCount)) < 0 ) {
|
|
// handle underflow
|
|
InterlockedIncrement(&fdx->OpenCloseRefCount);
|
|
}
|
|
}
|
|
ExReleaseFastMutex(&fdx->OpenCloseMutex);
|
|
|
|
target_exit:
|
|
|
|
DD((PCE)fdx,DDT,"PptFdoClose - OpenCloseRefCount after close = %d\n",fdx->OpenCloseRefCount);
|
|
|
|
return P4CompleteRequestReleaseRemLock( Irp, STATUS_SUCCESS, 0, &fdx->RemoveLock );
|
|
}
|