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