Fixed possible deadlock in the CDC device driver if the USB connection is dropped while the CDC_REQ_SetLineEncoding control request is being processed by the stack (thanks to Jonathan Hudgins).

LUFA/DoxygenPages/ChangeLog.txt

@@ -53,6 +53,8 @@
   *   - Fixed inverted LED logic in the OLIMEX162 board LED driver
   *   - Fixed incorrect reponse to GET STATUS requests in device mode if NO_DEVICE_SELF_POWER or NO_DEVICE_REMOTE_WAKEUP tokens are defined (thanks to Georg Glock)
   *   - Fixed inverted LED logic in the USB2AX board LED driver
+  *   - Fixed possible deadlock in the CDC device driver if the USB connection is dropped while the CDC_REQ_SetLineEncoding control request is being processed by
+  *     the stack (thanks to Jonathan Hudgins)
   *  - Library Applications:
   *   - Fixed error in the AVRISP-MKII programmer when ISP mode is used at 64KHz (thanks to Ben R. Porter)
   *   - Fixed AVRISP-MKII programmer project failing to compile for the U4 chips when VTARGET_ADC_CHANNEL is defined to an invalid channel and NO_VTARGET_DETECT is

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

@@ -69,8 +69,12 @@ void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* const CDCInter
 			{
 				Endpoint_ClearSETUP();
 
-				while (!(Endpoint_IsOUTReceived()));
+				while (!(Endpoint_IsOUTReceived()))
-
+				{
+					if (USB_DeviceState == DEVICE_STATE_Unattached)
+					  return;
+				}
+				
 				CDCInterfaceInfo->State.LineEncoding.BaudRateBPS = Endpoint_Read_32_LE();
 				CDCInterfaceInfo->State.LineEncoding.CharFormat  = Endpoint_Read_8();
 				CDCInterfaceInfo->State.LineEncoding.ParityType  = Endpoint_Read_8();