alpha: fix WARN_ON in __local_bh_enable()

Interrupts ought to be disabled _before_ irq_enter().
Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Matt Turner <mattst88@monolith.freenet-rz.de>

arch/alpha/kernel/irq.c

@@ -160,15 +160,14 @@ handle_irq(int irq)
 		return;
 	}
 
-	irq_enter();
 	/*
-	 * handle_irq() must be called with IPL_MAX. Note that we do not
+	 * From here we must proceed with IPL_MAX. Note that we do not
 	 * explicitly enable interrupts afterwards - some MILO PALcode
 	 * (namely LX164 one) seems to have severe problems with RTI
 	 * at IPL 0.
 	 */
 	local_irq_disable();
+	irq_enter();
 	generic_handle_irq_desc(irq, desc);
 	irq_exit();
 }
-