[CMAKE]

sync with trunk (r49230)

svn path=/branches/cmake-bringup/; revision=49246

drivers/storage/classpnp/clntirp.c

@@ -0,0 +1,74 @@
+/*++
+
+Copyright (C) Microsoft Corporation, 1991 - 1999
+
+Module Name:
+
+    clntirp.c
+
+Abstract:
+
+    Client IRP queuing routines for CLASSPNP
+
+Environment:
+
+    kernel mode only
+
+Notes:
+
+
+Revision History:
+
+--*/
+
+#include "classp.h"
+#include "debug.h"
+
+
+/*
+ *  EnqueueDeferredClientIrp
+ *
+ *      Note: we currently do not support Cancel for storage irps.
+ */
+VOID EnqueueDeferredClientIrp(PCLASS_PRIVATE_FDO_DATA FdoData, PIRP Irp)
+{
+    KIRQL oldIrql;
+
+    KeAcquireSpinLock(&FdoData->SpinLock, &oldIrql);
+    InsertTailList(&FdoData->DeferredClientIrpList, &Irp->Tail.Overlay.ListEntry);
+    KeReleaseSpinLock(&FdoData->SpinLock, oldIrql);
+}
+
+
+/*
+ *  DequeueDeferredClientIrp
+ *
+ */
+PIRP DequeueDeferredClientIrp(PCLASS_PRIVATE_FDO_DATA FdoData)
+{
+    KIRQL oldIrql;
+    PLIST_ENTRY listEntry;
+    PIRP irp;
+
+    KeAcquireSpinLock(&FdoData->SpinLock, &oldIrql);
+    if (IsListEmpty(&FdoData->DeferredClientIrpList)){
+        listEntry = NULL;
+    }
+    else {
+        listEntry = RemoveHeadList(&FdoData->DeferredClientIrpList);
+    }
+    KeReleaseSpinLock(&FdoData->SpinLock, oldIrql);
+
+    if (listEntry == NULL) {
+        irp = NULL;
+    } else {
+        irp = CONTAINING_RECORD(listEntry, IRP, Tail.Overlay.ListEntry);
+        ASSERT(irp->Type == IO_TYPE_IRP);
+        InitializeListHead(&irp->Tail.Overlay.ListEntry);
+    }
+
+    return irp;
+}
+
+
+