--- linux-2.6.39/sound/pci/rme9652/hdspm.c.orig	2011-05-19 06:06:34.000000000 +0200
+++ linux-2.6.39/sound/pci/rme9652/hdspm.c	2011-06-07 10:26:35.778933230 +0200
@@ -1639,12 +1639,14 @@
 		}
 	}
 	hmidi->pending = 0;
+	spin_unlock_irqrestore (&hmidi->lock, flags);
 
+	spin_lock_irqsave (&hmidi->hdspm->lock, flags);
 	hmidi->hdspm->control_register |= hmidi->ie;
 	hdspm_write(hmidi->hdspm, HDSPM_controlRegister,
 		    hmidi->hdspm->control_register);
+	spin_unlock_irqrestore (&hmidi->hdspm->lock, flags);
 
-	spin_unlock_irqrestore (&hmidi->lock, flags);
 	return snd_hdspm_midi_output_write (hmidi);
 }