drivers/network/ndisuio/misc.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS NDIS User I/O driver
   4  * FILE:        misc.c
   5  * PURPOSE:     Helper functions
   6  * PROGRAMMERS: Cameron Gutman (cameron.gutman@reactos.org)
   7  */
   8
   9 #include "ndisuio.h"
  10
  11 #define NDEBUG
  12 #include <debug.h>
  13
  14 PNDISUIO_ADAPTER_CONTEXT
  15 FindAdapterContextByName(PNDIS_STRING DeviceName)
  16 {
  17     KIRQL OldIrql;
  18     PLIST_ENTRY CurrentEntry;
  19     PNDISUIO_ADAPTER_CONTEXT AdapterContext;
  20
  21     KeAcquireSpinLock(&GlobalAdapterListLock, &OldIrql);
  22     CurrentEntry = GlobalAdapterList.Flink;
  23     while (CurrentEntry != &GlobalAdapterList)
  24     {
  25         AdapterContext = CONTAINING_RECORD(CurrentEntry, NDISUIO_ADAPTER_CONTEXT, ListEntry);
  26
  27         /* Check if the device name matches */
  28         if (RtlEqualUnicodeString(&AdapterContext->DeviceName, DeviceName, TRUE))
  29         {
  30             KeReleaseSpinLock(&GlobalAdapterListLock, OldIrql);
  31             return AdapterContext;
  32         }
  33
  34         CurrentEntry = CurrentEntry->Flink;
  35     }
  36     KeReleaseSpinLock(&GlobalAdapterListLock, OldIrql);
  37
  38     return NULL;
  39 }
  40
  41 VOID
  42 ReferenceAdapterContext(PNDISUIO_ADAPTER_CONTEXT AdapterContext)
  43 {
  44     /* Increment the open count */
  45     AdapterContext->OpenCount++;
  46 }
  47
  48 VOID
  49 DereferenceAdapterContextWithOpenEntry(PNDISUIO_ADAPTER_CONTEXT AdapterContext,
  50                                        PNDISUIO_OPEN_ENTRY OpenEntry)
  51 {
  52     KIRQL OldIrql;
  53
  54     /* Lock the adapter context */
  55     KeAcquireSpinLock(&AdapterContext->Spinlock, &OldIrql);
  56
  57     /* Decrement the open count */
  58     AdapterContext->OpenCount--;
  59
  60     /* Cleanup the open entry if we were given one */
  61     if (OpenEntry != NULL)
  62     {
  63         /* Remove the open entry */
  64         RemoveEntryList(&OpenEntry->ListEntry);
  65
  66         /* Invalidate the FO */
  67         OpenEntry->FileObject->FsContext = NULL;
  68         OpenEntry->FileObject->FsContext2 = NULL;
  69
  70         /* Free the open entry */
  71         ExFreePool(OpenEntry);
  72     }
  73
  74     /* See if this binding can be destroyed */
  75     if (AdapterContext->OpenCount == 0)
  76     {
  77         /* Unlock the context */
  78         KeReleaseSpinLock(&AdapterContext->Spinlock, OldIrql);
  79
  80         /* Destroy the adapter context */
  81         UnbindAdapterByContext(AdapterContext);
  82     }
  83     else
  84     {
  85         /* Still more references on it */
  86         KeReleaseSpinLock(&AdapterContext->Spinlock, OldIrql);
  87     }
  88 }