[PORTCLS]

- Check if there is a silence buffer available when there is no audio mapping available
- ignore failure for allocation requirements

svn path=/trunk/; revision=47909

reactos/drivers/wdm/audio/backpln/portcls/irpstream.cpp

@@ -259,7 +259,7 @@ CIrpQueue::GetMapping(
         m_CurrentOffset = Offset = 0;
     }
 
-    if (!Irp)
+    if (!Irp && m_SilenceBuffer && m_MaxFrameSize)
     {
         DPRINT("NoIrp\n");
         // no irp available, use silence buffer
@@ -268,6 +268,13 @@ CIrpQueue::GetMapping(
         return STATUS_SUCCESS;
     }
 
+    if (!Irp)
+    {
+        // no irp buffer available
+        return STATUS_UNSUCCESSFUL;
+    }
+
+
     // get stream header
     StreamHeader = (PKSSTREAM_HEADER)Irp->Tail.Overlay.DriverContext[2];
 

reactos/drivers/wdm/audio/backpln/portcls/pin_wavepci.cpp

@@ -824,7 +824,6 @@ CPortPinWavePci::Init(
     if (!NT_SUCCESS(Status))
     {
         DPRINT("GetAllocatorFraming failed with %x\n", Status);
-        return Status;
     }
 
     DPRINT("OptionFlags %x RequirementsFlag %x PoolType %x Frames %lu FrameSize %lu FileAlignment %lu\n",