diff --git a/drivers/staging/comedi/drivers/addi_apci_3120.c b/drivers/staging/comedi/drivers/addi_apci_3120.c
index b0d62cd475e1..358bfd3f3417 100644
--- a/drivers/staging/comedi/drivers/addi_apci_3120.c
+++ b/drivers/staging/comedi/drivers/addi_apci_3120.c
@@ -213,15 +213,14 @@ static int apci3120_auto_attach(struct comedi_device *dev,
 	s->range_table	= &range_digital;
 	s->insn_bits	= apci3120_di_insn_bits;
 
-	/*  Allocate and Initialise DO Subdevice Structures */
+	/* Digital Output subdevice */
 	s = &dev->subdevices[3];
-	s->type = COMEDI_SUBD_DO;
-	s->subdev_flags =
-		SDF_READABLE | SDF_WRITEABLE | SDF_GROUND | SDF_COMMON;
-	s->n_chan = 4;
-	s->maxdata = 1;
-	s->range_table = &range_digital;
-	s->insn_bits = apci3120_do_insn_bits;
+	s->type		= COMEDI_SUBD_DO;
+	s->subdev_flags	= SDF_WRITEABLE;
+	s->n_chan	= 4;
+	s->maxdata	= 1;
+	s->range_table	= &range_digital;
+	s->insn_bits	= apci3120_do_insn_bits;
 
 	/*  Allocate and Initialise Timer Subdevice Structures */
 	s = &dev->subdevices[4];