staging: comedi: addi_apci_1710: remove dma setup/free code

This driver does not use dma. Remove the code that sets up the
dma and allocates the buffers in the attach and the code that
frees the buffers in the detach.

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_1710.c

@@ -65,7 +65,7 @@ static int apci1710_attach_pci(struct comedi_device *dev,
 	const struct addi_board *this_board;
 	struct addi_private *devpriv;
 	struct comedi_subdevice *s;
-	int ret, pages, i, n_subdevices;
+	int ret;
 
 	this_board = apci1710_find_boardinfo(dev, pcidev);
 	if (!this_board)
@@ -81,8 +81,6 @@ static int apci1710_attach_pci(struct comedi_device *dev,
 	ret = comedi_pci_enable(pcidev, dev->board_name);
 	if (ret)
 		return ret;
-	if (this_board->i_Dma)
-		pci_set_master(pcidev);
 
 	if (this_board->i_IorangeBase1)
 		dev->iobase = pci_resource_start(pcidev, 1);
@@ -118,40 +116,6 @@ static int apci1710_attach_pci(struct comedi_device *dev,
 			dev->irq = pcidev->irq;
 	}
 
-	devpriv->us_UseDma = ADDI_ENABLE;
-
-	if (devpriv->s_EeParameters.i_Dma) {
-		if (devpriv->us_UseDma == ADDI_ENABLE) {
-			/*  alloc DMA buffers */
-			devpriv->b_DmaDoubleBuffer = 0;
-			for (i = 0; i < 2; i++) {
-				for (pages = 4; pages >= 0; pages--) {
-					devpriv->ul_DmaBufferVirtual[i] =
-						(void *) __get_free_pages(GFP_KERNEL, pages);
-
-					if (devpriv->ul_DmaBufferVirtual[i])
-						break;
-				}
-				if (devpriv->ul_DmaBufferVirtual[i]) {
-					devpriv->ui_DmaBufferPages[i] = pages;
-					devpriv->ui_DmaBufferSize[i] =
-						PAGE_SIZE * pages;
-					devpriv->ui_DmaBufferSamples[i] =
-						devpriv->
-						ui_DmaBufferSize[i] >> 1;
-					devpriv->ul_DmaBufferHw[i] =
-						virt_to_bus((void *)devpriv->
-						ul_DmaBufferVirtual[i]);
-				}
-			}
-			if (!devpriv->ul_DmaBufferVirtual[0])
-				devpriv->us_UseDma = ADDI_DISABLE;
-
-			if (devpriv->ul_DmaBufferVirtual[1])
-				devpriv->b_DmaDoubleBuffer = 1;
-		}
-	}
-
 	i_ADDI_AttachPCI1710(dev);
 
 	devpriv->s_BoardInfos.ui_Address = pci_resource_start(pcidev, 2);
@@ -162,31 +126,12 @@ static int apci1710_attach_pci(struct comedi_device *dev,
 
 static void apci1710_detach(struct comedi_device *dev)
 {
-	const struct addi_board *this_board = comedi_board(dev);
 	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
-	struct addi_private *devpriv = dev->private;
 
-	if (devpriv) {
-		if (dev->iobase)
-			i_APCI1710_Reset(dev);
-		if (dev->irq)
-			free_irq(dev->irq, dev);
-		if ((this_board->pc_EepromChip == NULL) ||
-		    (strcmp(this_board->pc_EepromChip, ADDIDATA_9054) != 0)) {
-			if (devpriv->ul_DmaBufferVirtual[0]) {
-				free_pages((unsigned long)devpriv->
-					ul_DmaBufferVirtual[0],
-					devpriv->ui_DmaBufferPages[0]);
-			}
-			if (devpriv->ul_DmaBufferVirtual[1]) {
-				free_pages((unsigned long)devpriv->
-					ul_DmaBufferVirtual[1],
-					devpriv->ui_DmaBufferPages[1]);
-			}
-		} else {
-			iounmap(devpriv->dw_AiBase);
-		}
-	}
+	if (dev->iobase)
+		i_APCI1710_Reset(dev);
+	if (dev->irq)
+		free_irq(dev->irq, dev);
 	if (pcidev) {
 		if (dev->iobase)
 			comedi_pci_disable(pcidev);