Fixed possible device lockup when INTERRUPT_CONTROL_ENDPOINT is enabled and the control endpoint is not properly selected when the ISR completes.

LUFA/Drivers/USB/LowLevel/USBInterrupt.c

@@ -237,10 +237,13 @@ ISR(USB_COM_vect, ISR_BLOCK)
 
 	Endpoint_SelectEndpoint(ENDPOINT_CONTROLEP);
 	USB_INT_Disable(USB_INT_RXSTPI);
-	sei();
 
-	USB_USBTask();
+	NONATOMIC_BLOCK(NONATOMIC_FORCEOFF)
+	{
+		USB_Device_ProcessControlRequest();
+	}
 
+	Endpoint_SelectEndpoint(ENDPOINT_CONTROLEP);
 	USB_INT_Enable(USB_INT_RXSTPI);
 	Endpoint_SelectEndpoint(PrevSelectedEndpoint);
 }

LUFA/Drivers/USB/LowLevel/USBInterrupt.h

@@ -44,6 +44,7 @@
 	/* Includes: */
 		#include <avr/io.h>
 		#include <avr/interrupt.h>
+		#include <util/atomic.h>
 		#include <stdbool.h>
 		
 		#include "../../../Common/Common.h"

LUFA/ManPages/ChangeLog.txt

@@ -15,6 +15,8 @@
   *    LIBUSB_DRIVER_COMPAT, as it applies to all software on all platforms using the libUSB driver
   *
   *  <b>Fixed:</b>
+  *  - Fixed possible device lockup when INTERRUPT_CONTROL_ENDPOINT is enabled and the control endpoint is not properly
+  *    selected when the ISR completes
   *
   *  \section Sec_ChangeLog100512 Version 100512
   *