Fixed race conditions in the CDC, HID and Mass Storage class drivers when processing some control requests.

LUFA/DoxygenPages/ChangeLog.txt

@@ -26,6 +26,7 @@
   *  - Core:
   *   - Fixed ring buffer size limited to 255 elements, instead of the intended 65535 elements.
   *   - Fixed CDC class drivers not saving and sending all 16-bits of the control line states (thanks to Matthew Swabey)
+  *   - Fixed race conditions in the CDC, HID and Mass Storage class drivers when processing some control requests
   *  - Library Applications:
   *   - Added reliability patches to the AVRISP-MKII Clone project's PDI/TPI protocols (thanks to Justin Mattair)
   *   - Fixed AVRISP-MKII Clone compile warning on AVR8 U4 targets even when NO_VTARGET_DETECT is enabled

LUFA/DoxygenPages/LUFAPoweredProjects.txt

@@ -136,6 +136,10 @@
  *  - Elektor Magazine, "20 x Open Source" by Jens Nickel, March 2010 Issue
  *  - Circuit Cellar Magazine, "Advanced USB Design Debugging" by Collin O'Flynn, August 2010 Issue
  *
+ *  \section Sec_PortsAndForks Non-Official LUFA Ports and Forks
+ *  - NXP's official "nxpusblib" LUFA fork, for LPC devices: http://www.lpcware.com/content/project/nxpusblib
+ *  - Kevin Mehall's LUFA port to the NXP LPC13xx: https://github.com/kevinmehall/LUFA-LPC13xx
+ *
  *  \section Sec_LUFANotableMentions Other Notable Mentions of LUFA
  *  - Adafruit "Ask an Engineer", 7th November 2010
  *  - Arduino 2010 Keynote speech

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

@@ -51,10 +51,14 @@ void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* const CDCInter
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
+
+				while (!(Endpoint_IsINReady()));
+
 				Endpoint_Write_32_LE(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
 				Endpoint_Write_8(CDCInterfaceInfo->State.LineEncoding.CharFormat);
 				Endpoint_Write_8(CDCInterfaceInfo->State.LineEncoding.ParityType);
 				Endpoint_Write_8(CDCInterfaceInfo->State.LineEncoding.DataBits);
+
 				Endpoint_ClearIN();
 				Endpoint_ClearStatusStage();
 			}
@@ -64,13 +68,17 @@ void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* const CDCInter
 			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
+
+				while (!(Endpoint_IsOUTReceived()));
+
 				CDCInterfaceInfo->State.LineEncoding.BaudRateBPS = Endpoint_Read_32_LE();
 				CDCInterfaceInfo->State.LineEncoding.CharFormat  = Endpoint_Read_8();
 				CDCInterfaceInfo->State.LineEncoding.ParityType  = Endpoint_Read_8();
 				CDCInterfaceInfo->State.LineEncoding.DataBits    = Endpoint_Read_8();
+
 				Endpoint_ClearOUT();
 				Endpoint_ClearStatusStage();
-
+			
 				EVENT_CDC_Device_LineEncodingChanged(CDCInterfaceInfo);
 			}
 

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

@@ -94,6 +94,7 @@ void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInter
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
+				while (!(Endpoint_IsINReady()));
 				Endpoint_Write_8(HIDInterfaceInfo->State.UsingReportProtocol);
 				Endpoint_ClearIN();
 				Endpoint_ClearStatusStage();
@@ -124,6 +125,7 @@ void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInter
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
+				while (!(Endpoint_IsINReady()));
 				Endpoint_Write_8(HIDInterfaceInfo->State.IdleCount >> 2);
 				Endpoint_ClearIN();
 				Endpoint_ClearStatusStage();

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

@@ -61,6 +61,7 @@ void MS_Device_ProcessControlRequest(USB_ClassInfo_MS_Device_t* const MSInterfac
 			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				Endpoint_ClearSETUP();
+				while (!(Endpoint_IsINReady()));
 				Endpoint_Write_8(MSInterfaceInfo->Config.TotalLUNs - 1);
 				Endpoint_ClearIN();
 				Endpoint_ClearStatusStage();