staging: comedi: dt3000: cleanup "find pci device" code

The "find pci device" code for this driver was split between
two functions which could cause the driver to walk the pci
bus multiple times while looking for a match.

Consolidate the functions into the format that is more
standard for the comedi pci drivers.
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/dt3000.c

@@ -159,7 +159,6 @@ static const struct dt3k_boardtype dt3k_boardtypes[] = {
 	 },
 };
 
-#define n_dt3k_boards sizeof(dt3k_boardtypes)/sizeof(struct dt3k_boardtype)
 #define this_board ((const struct dt3k_boardtype *)dev->board_ptr)
 
 #define DT3000_SIZE		(4*0x1000)
@@ -797,87 +796,65 @@ static int setup_pci(struct comedi_device *dev)
 	return 0;
 }
 
-static struct pci_dev *dt_pci_find_device(struct pci_dev *from, int *board)
+static struct pci_dev *dt3000_find_pci_dev(struct comedi_device *dev,
+					   struct comedi_devconfig *it)
 {
+	struct pci_dev *pcidev = NULL;
+	int bus = it->options[0];
+	int slot = it->options[1];
 	int i;
 
-	for (from = pci_get_device(PCI_VENDOR_ID_DT, PCI_ANY_ID, from);
-	     from != NULL;
-	     from = pci_get_device(PCI_VENDOR_ID_DT, PCI_ANY_ID, from)) {
-		for (i = 0; i < n_dt3k_boards; i++) {
-			if (from->device == dt3k_boardtypes[i].device_id) {
-				*board = i;
-				return from;
-			}
+	for_each_pci_dev(pcidev) {
+		if (bus || slot) {
+			if (bus != pcidev->bus->number ||
+			    slot != PCI_SLOT(pcidev->devfn))
+				continue;
 		}
-		printk
-		    ("unknown Data Translation PCI device found with device_id=0x%04x\n",
-		     from->device);
-	}
-	*board = -1;
-	return from;
-}
-
-static int dt_pci_probe(struct comedi_device *dev, int bus, int slot)
-{
-	int board;
-	int ret;
-	struct pci_dev *pcidev;
-
-	pcidev = NULL;
-	while ((pcidev = dt_pci_find_device(pcidev, &board)) != NULL) {
-		if ((bus == 0 && slot == 0) ||
-		    (pcidev->bus->number == bus &&
-		     PCI_SLOT(pcidev->devfn) == slot)) {
-			break;
+		if (pcidev->vendor != PCI_VENDOR_ID_DT)
+			continue;
+		for (i = 0; i < ARRAY_SIZE(dt3k_boardtypes); i++) {
+			if (dt3k_boardtypes[i].device_id != pcidev->device)
+				continue;
+			dev->board_ptr = dt3k_boardtypes + i;
+			return pcidev;
 		}
 	}
-	devpriv->pci_dev = pcidev;
-
-	if (board >= 0)
-		dev->board_ptr = dt3k_boardtypes + board;
-
-	if (!devpriv->pci_dev)
-		return 0;
-
-	ret = setup_pci(dev);
-	if (ret < 0)
-		return ret;
-
-	return 1;
+	dev_err(dev->class_dev,
+		"No supported board found! (req. bus %d, slot %d)\n",
+		bus, slot);
+	return NULL;
 }
 
 static int dt3000_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 {
+	struct pci_dev *pcidev;
 	struct comedi_subdevice *s;
-	int bus, slot;
 	int ret = 0;
 
 	dev_dbg(dev->class_dev, "dt3000:\n");
-	bus = it->options[0];
-	slot = it->options[1];
 
 	ret = alloc_private(dev, sizeof(struct dt3k_private));
 	if (ret < 0)
 		return ret;
 
-	ret = dt_pci_probe(dev, bus, slot);
+	pcidev = dt3000_find_pci_dev(dev, it);
+	if (!pcidev)
+		return -EIO;
+	devpriv->pci_dev = pcidev;
+
+	ret = setup_pci(dev);
 	if (ret < 0)
 		return ret;
-	if (ret == 0) {
-		dev_warn(dev->class_dev, "no DT board found\n");
-		return -ENODEV;
-	}
 
 	dev->board_name = this_board->name;
 
-	if (request_irq(devpriv->pci_dev->irq, dt3k_interrupt, IRQF_SHARED,
+	if (request_irq(pcidev->irq, dt3k_interrupt, IRQF_SHARED,
 			"dt3000", dev)) {
 		dev_err(dev->class_dev, "unable to allocate IRQ %u\n",
-			devpriv->pci_dev->irq);
+			pcidev->irq);
 		return -EINVAL;
 	}
-	dev->irq = devpriv->pci_dev->irq;
+	dev->irq = pcidev->irq;
 
 	ret = comedi_alloc_subdevices(dev, 4);
 	if (ret)