staging: comedi: amplc_pc236: check bus type before accessing LCR

The PCI-local bridge LCR registers are (assumed to be) present and used
iff the board is a PCI board (a PCI236).  Currently the code tests if
devpriv->lcr_iobase is valid before accessing the registers.  Instead,
check if the board is a PCI board and assume devpriv->lcr_iobase is
valid if so.  (Currently, no validity check is performed as the PCI
vendor and device ID ought to suffice, but simple checks could be added
when attaching the device.)

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/amplc_pc236.c

@@ -228,12 +228,13 @@ static int pc236_request_region(struct comedi_device *dev, unsigned long from,
  */
 static void pc236_intr_disable(struct comedi_device *dev)
 {
+	const struct pc236_board *thisboard = comedi_board(dev);
 	struct pc236_private *devpriv = dev->private;
 	unsigned long flags;
 
 	spin_lock_irqsave(&dev->spinlock, flags);
 	devpriv->enable_irq = 0;
-	if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI) && devpriv->lcr_iobase)
+	if (is_pci_board(thisboard))
 		outl(PCI236_INTR_DISABLE, devpriv->lcr_iobase + PLX9052_INTCSR);
 	spin_unlock_irqrestore(&dev->spinlock, flags);
 }
@@ -245,12 +246,13 @@ static void pc236_intr_disable(struct comedi_device *dev)
  */
 static void pc236_intr_enable(struct comedi_device *dev)
 {
+	const struct pc236_board *thisboard = comedi_board(dev);
 	struct pc236_private *devpriv = dev->private;
 	unsigned long flags;
 
 	spin_lock_irqsave(&dev->spinlock, flags);
 	devpriv->enable_irq = 1;
-	if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI) && devpriv->lcr_iobase)
+	if (is_pci_board(thisboard))
 		outl(PCI236_INTR_ENABLE, devpriv->lcr_iobase + PLX9052_INTCSR);
 	spin_unlock_irqrestore(&dev->spinlock, flags);
 }
@@ -264,15 +266,15 @@ static void pc236_intr_enable(struct comedi_device *dev)
  */
 static int pc236_intr_check(struct comedi_device *dev)
 {
+	const struct pc236_board *thisboard = comedi_board(dev);
 	struct pc236_private *devpriv = dev->private;
 	int retval = 0;
 	unsigned long flags;
 
 	spin_lock_irqsave(&dev->spinlock, flags);
 	if (devpriv->enable_irq) {
 		retval = 1;
-		if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI) &&
-		    devpriv->lcr_iobase) {
+		if (is_pci_board(thisboard)) {
 			if ((inl(devpriv->lcr_iobase + PLX9052_INTCSR)
 			     & PLX9052_INTCSR_LI1STAT_MASK)
 			    == PLX9052_INTCSR_LI1STAT_INACTIVE) {