staging: comedi: ni_labpc: remove subdevice pointer math

Convert the comedi_subdevice access from pointer math to array
access.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c
index ab8b787..65d5dfc 100644 (file)
--- a/drivers/staging/comedi/drivers/ni_labpc.c
+++ b/drivers/staging/comedi/drivers/ni_labpc.c
@@ -628,7 +628,7 @@ int labpc_common_attach(struct comedi_device *dev, unsigned long iobase,
                return ret;
 
        /* analog input subdevice */
-       s = dev->subdevices + 0;
+       s = &dev->subdevices[0];
        dev->read_subdev = s;
        s->type = COMEDI_SUBD_AI;
        s->subdev_flags =
@@ -643,7 +643,7 @@ int labpc_common_attach(struct comedi_device *dev, unsigned long iobase,
        s->cancel = labpc_cancel;
 
        /* analog output */
-       s = dev->subdevices + 1;
+       s = &dev->subdevices[1];
        if (thisboard->has_ao) {
                /*
                 * Could provide command support, except it only has a
@@ -670,7 +670,7 @@ int labpc_common_attach(struct comedi_device *dev, unsigned long iobase,
        }
 
        /* 8255 dio */
-       s = dev->subdevices + 2;
+       s = &dev->subdevices[2];
        /*  if board uses io memory we have to give a custom callback
         * function to the 8255 driver */
        if (thisboard->memory_mapped_io)
@@ -680,7 +680,7 @@ int labpc_common_attach(struct comedi_device *dev, unsigned long iobase,
                subdev_8255_init(dev, s, NULL, dev->iobase + DIO_BASE_REG);
 
        /*  calibration subdevices for boards that have one */
-       s = dev->subdevices + 3;
+       s = &dev->subdevices[3];
        if (thisboard->register_layout == labpc_1200_layout) {
                s->type = COMEDI_SUBD_CALIB;
                s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
@@ -695,7 +695,7 @@ int labpc_common_attach(struct comedi_device *dev, unsigned long iobase,
                s->type = COMEDI_SUBD_UNUSED;
 
        /* EEPROM */
-       s = dev->subdevices + 4;
+       s = &dev->subdevices[4];
        if (thisboard->register_layout == labpc_1200_layout) {
                s->type = COMEDI_SUBD_MEMORY;
                s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
@@ -809,8 +809,12 @@ static int labpc_find_device(struct comedi_device *dev, int bus, int slot)
 
 void labpc_common_detach(struct comedi_device *dev)
 {
-       if (dev->subdevices)
-               subdev_8255_cleanup(dev, dev->subdevices + 2);
+       struct comedi_subdevice *s;
+
+       if (dev->subdevices) {
+               s = &dev->subdevices[2];
+               subdev_8255_cleanup(dev, s);
+       }
 #ifdef CONFIG_ISA_DMA_API
        /* only free stuff if it has been allocated by _attach */
        kfree(devpriv->dma_buffer);