Prepare cancelling transfers from the stack side. The actual handling will happen in the HCD modules where transfer management has to be done anyway.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21043 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/bus_managers/usb/BusManager.cpp

@@ -268,6 +268,14 @@ BusManager::SubmitTransfer(Transfer *transfer)
 }
 
 
+status_t
+BusManager::CancelQueuedTransfers(Pipe *pipe)
+{
+	// virtual function to be overridden
+	return B_ERROR;
+}
+
+
 status_t
 BusManager::NotifyPipeChange(Pipe *pipe, usb_change change)
 {

src/add-ons/kernel/bus_managers/usb/Pipe.cpp

@@ -41,8 +41,7 @@ Pipe::SubmitTransfer(Transfer *transfer)
 status_t
 Pipe::CancelQueuedTransfers()
 {
-	TRACE_ERROR(("USB Pipe: cancelling transfers is not implemented!\n"));
+	return GetBusManager()->CancelQueuedTransfers(this);
-	return B_ERROR;
 }
 
 

src/add-ons/kernel/bus_managers/usb/usb_p.h

@@ -171,6 +171,7 @@ virtual	status_t						Start();
 virtual	status_t						Stop();
 
 virtual	status_t						SubmitTransfer(Transfer *transfer);
+virtual	status_t						CancelQueuedTransfers(Pipe *pipe);
 
 virtual	status_t						NotifyPipeChange(Pipe *pipe,
 											usb_change change);