Device mode class driver callbacks are now fired before the control request status stage is sent to prevent the host from timing out if another request is immediately fired and the device has a lengthy callback routine.

Inlined currently unused MIDI ProcessControlRequest routine.

LUFA/Drivers/USB/Class/Device/CDC.c

@@ -65,9 +65,8 @@ void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* CDCInterfaceIn
 			{
 				Endpoint_ClearSETUP();
 				Endpoint_Read_Control_Stream_LE(&CDCInterfaceInfo->State.LineEncoding, sizeof(CDCInterfaceInfo->State.LineEncoding));
-				Endpoint_ClearIN();
-
 				EVENT_CDC_Device_LineEncodingChanged(CDCInterfaceInfo);
+				Endpoint_ClearIN();
 			}
 	
 			break;
@@ -77,7 +76,6 @@ void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* CDCInterfaceIn
 				Endpoint_ClearSETUP();
 				
 				CDCInterfaceInfo->State.ControlLineStates.HostToDevice = USB_ControlRequest.wValue;
-				
 				EVENT_CDC_Device_ControLineStateChanged(CDCInterfaceInfo);
 
 				Endpoint_ClearStatusStage();

LUFA/Drivers/USB/Class/Device/HID.c

@@ -79,9 +79,8 @@ void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInter
 				uint8_t  ReportID = (USB_ControlRequest.wValue & 0xFF);
 
 				Endpoint_Read_Control_Stream_LE(ReportOUTData, ReportOUTSize);
-				Endpoint_ClearIN();
-				
 				CALLBACK_HID_Device_ProcessHIDReport(HIDInterfaceInfo, ReportID, ReportOUTData, ReportOUTSize);
+				Endpoint_ClearIN();				
 			}
 			
 			break;

LUFA/Drivers/USB/Class/Device/MIDI.c

@@ -35,11 +35,6 @@
 #define  __INCLUDE_FROM_MIDI_DRIVER
 #include "MIDI.h"
 
-void MIDI_Device_ProcessControlRequest(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo)
-{
-
-}
-
 bool MIDI_Device_ConfigureEndpoints(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo)
 {
 	memset(&MIDIInterfaceInfo->State, 0x00, sizeof(MIDIInterfaceInfo->State));

LUFA/Drivers/USB/Class/Device/MIDI.h

@@ -112,13 +112,6 @@
 			 */
 			bool MIDI_Device_ConfigureEndpoints(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 			
-			/** Processes incoming control requests from the host, that are directed to the given MIDI class interface. This should be
-			 *  linked to the library \ref EVENT_USB_Device_UnhandledControlRequest() event.
-			 *
-			 *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state
-			 */		
-			void MIDI_Device_ProcessControlRequest(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
-
 			/** Sends a MIDI event packet to the host. If no host is connected, the event packet is discarded. Events are queued into the
 			 *  endpoint bank until either the endpoint bank is full, or \ref MIDI_Device_Flush() is called. This allows for multiple
 			 *  MIDI events to be packed into a single endpoint packet, increasing data throughput.
@@ -168,7 +161,18 @@
 			static inline void MIDI_Device_USBTask(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo)
 			{
 				(void)MIDIInterfaceInfo;
-			}		
+			}
+			
+			/** Processes incoming control requests from the host, that are directed to the given MIDI class interface. This should be
+			 *  linked to the library \ref EVENT_USB_Device_UnhandledControlRequest() event.
+			 *
+			 *  \param[in,out] MIDIInterfaceInfo  Pointer to a structure containing a MIDI Class configuration and state
+			 */		
+			static inline void MIDI_Device_ProcessControlRequest(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
+			static inline void MIDI_Device_ProcessControlRequest(USB_ClassInfo_MIDI_Device_t* const MIDIInterfaceInfo)
+			{
+				(void)MIDIInterfaceInfo;
+			}
 
 	/* Disable C linkage for C++ Compilers: */
 		#if defined(__cplusplus)

LUFA/Drivers/USB/Class/Device/RNDIS.c

@@ -83,9 +83,8 @@ void RNDIS_Device_ProcessControlRequest(USB_ClassInfo_RNDIS_Device_t* const RNDI
 				Endpoint_ClearSETUP();
 
 				Endpoint_Read_Control_Stream_LE(RNDISInterfaceInfo->State.RNDISMessageBuffer, USB_ControlRequest.wLength);
-				Endpoint_ClearIN();
-
 				RNDIS_Device_ProcessRNDISControlMessage(RNDISInterfaceInfo);
+				Endpoint_ClearIN();
 			}
 			
 			break;

LUFA/ManPages/ChangeLog.txt

@@ -39,6 +39,8 @@
   *    now be implemented via seperate programming headers
   *  - The CDC class bootloader now uses a watchdog reset rather than a soft-reset when exited to ensure that all hardware is
   *    properly reset to their defaults
+  *  - Device mode class driver callbacks are now fired before the control request status stage is sent to prevent the host from
+  *    timing out if another request is immediately fired and the device has a lengthy callback routine
   *
   *  <b>Fixed:</b>
   *  - Fixed software PDI/TPI programming mode in the AVRISP project not correctly toggling just the clock pin