staging: comedi: addi_apci_2200: only allocate needed subdevices

The addi-data "common" code always allocated 7 subdevices. This
driver only requires 3. Change the allocation and remove the
unused subdevices.

Update the comments for the initialization of each subdevice.

Also, update the subdevice that is passed to addi_watchdog_cleanup()
to match the new subdevice number.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/addi_apci_2200.c

@@ -84,7 +84,7 @@ static int apci2200_auto_attach(struct comedi_device *dev,
 {
 	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 	struct comedi_subdevice *s;
-	int ret, n_subdevices;
+	int ret;
 
 	dev->board_name = dev->driver->driver_name;
 
@@ -94,21 +94,12 @@ static int apci2200_auto_attach(struct comedi_device *dev,
 
 	dev->iobase = pci_resource_start(pcidev, 1);
 
-	n_subdevices = 7;
-	ret = comedi_alloc_subdevices(dev, n_subdevices);
+	ret = comedi_alloc_subdevices(dev, 3);
 	if (ret)
 		return ret;
 
-	/*  Allocate and Initialise AI Subdevice Structures */
+	/* Initialize the digital input subdevice */
 	s = &dev->subdevices[0];
-	s->type = COMEDI_SUBD_UNUSED;
-
-	/*  Allocate and Initialise AO Subdevice Structures */
-	s = &dev->subdevices[1];
-	s->type = COMEDI_SUBD_UNUSED;
-
-	/*  Allocate and Initialise DI Subdevice Structures */
-	s = &dev->subdevices[2];
 	s->type		= COMEDI_SUBD_DI;
 	s->subdev_flags	= SDF_READABLE;
 	s->n_chan	= 8;
@@ -116,8 +107,8 @@ static int apci2200_auto_attach(struct comedi_device *dev,
 	s->range_table	= &range_digital;
 	s->insn_bits	= apci2200_di_insn_bits;
 
-	/*  Allocate and Initialise DO Subdevice Structures */
-	s = &dev->subdevices[3];
+	/* Initialize the digital output subdevice */
+	s = &dev->subdevices[1];
 	s->type		= COMEDI_SUBD_DO;
 	s->subdev_flags	= SDF_WRITEABLE;
 	s->n_chan	= 16;
@@ -125,20 +116,12 @@ static int apci2200_auto_attach(struct comedi_device *dev,
 	s->range_table	= &range_digital;
 	s->insn_bits	= apci2200_do_insn_bits;
 
-	/*  Allocate and Initialise Timer Subdevice Structures */
-	s = &dev->subdevices[4];
+	/* Initialize the watchdog subdevice */
+	s = &dev->subdevices[2];
 	ret = addi_watchdog_init(s, dev->iobase + APCI2200_WDOG_REG);
 	if (ret)
 		return ret;
 
-	/*  Allocate and Initialise TTL */
-	s = &dev->subdevices[5];
-	s->type = COMEDI_SUBD_UNUSED;
-
-	/* EEPROM */
-	s = &dev->subdevices[6];
-	s->type = COMEDI_SUBD_UNUSED;
-
 	apci2200_reset(dev);
 	return 0;
 }
@@ -150,7 +133,7 @@ static void apci2200_detach(struct comedi_device *dev)
 	if (dev->iobase)
 		apci2200_reset(dev);
 	if (dev->subdevices)
-		addi_watchdog_cleanup(&dev->subdevices[4]);
+		addi_watchdog_cleanup(&dev->subdevices[2]);
 	if (pcidev) {
 		if (dev->iobase)
 			comedi_pci_disable(pcidev);