fxrequestbasekm.hpp

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/*++
 
  Copyright (c) Microsoft Corporation
 
  Module Name:
 
  FxRequestBaseKm.hpp
 
  Abstract:
 
  This module implements km specific functions for FxRequestBase.
 
  Author:
 
 
 
  Environment:
 
  Kernel mode only
 
  Revision History:
 
  --*/
 
#ifndef _FXREQUESTBASEKM_HPP_
#define _FXREQUESTBASEKM_HPP_
 
 
VOID
__inline
FxRequestBase::FreeMdls(
    VOID
    )
{
    PMDL pMdl, pNext;
 
    if (IsAllocatedFromIo() || IsCanComplete()) {
      return;
    }
 
    pMdl = m_Irp.GetIrp()->MdlAddress;
 
    //
    // Free any PMDLs that the lower layer allocated.  Since we are going
    // to free the PIRP ourself and not call IoCompleteRequest, we must mimic
    // the behavior in IoCompleteRequest which does the same thing.
    //
    while (pMdl != NULL) {
      pNext = pMdl->Next;
 
      if (pMdl->MdlFlags & MDL_PAGES_LOCKED) {
        MmUnlockPages(pMdl);
      }
      else if (GetDriverGlobals()->FxVerifierOn) {
        DbgPrint("pMdl %p, Flags 0x%x in PIRP %p should be locked",
            pMdl, pMdl->MdlFlags, m_Irp.GetIrp());
 
        FxVerifierDbgBreakPoint(GetDriverGlobals());
      }
 
      FxIrpMdlFree(pMdl);
      pMdl = pNext;
    }
 
    m_Irp.GetIrp()->MdlAddress = NULL;
}
 
#endif // _FXREQUESTBASEKM_HPP