staging: comedi: amplc_pc236: Remove most #if lines

Remove most of the #if IS_ENABLED(xxx) lines, but add extra if
(IS_ENABLED(xxx)) tests so the compiler can remove unreachable code.
The pci_driver stuff and device table is still conditionally compiled.

Also made pc236_find_pci() static as it was accidentally made non-static
by an earlier patch, so the compiler wouldn't remove it when it was
unreachable.

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

diff --git a/drivers/staging/comedi/drivers/amplc_pc236.c b/drivers/staging/comedi/drivers/amplc_pc236.c
index f119906..9cf514e 100644 (file)
--- a/drivers/staging/comedi/drivers/amplc_pc236.c
+++ b/drivers/staging/comedi/drivers/amplc_pc236.c
@@ -98,9 +98,7 @@ enum pc236_model { pc36at_model, pci236_model, anypci_model };
 
 struct pc236_board {
        const char *name;
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
        unsigned short devid;
-#endif
        enum pc236_bustype bustype;
        enum pc236_model model;
 };
@@ -133,18 +131,15 @@ static const struct pc236_board pc236_boards[] = {
    feel free to suggest moving the variable to the struct comedi_device struct.
  */
 struct pc236_private {
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
        /* PCI device */
        struct pci_dev *pci_dev;
        unsigned long lcr_iobase; /* PLX PCI9052 config registers in PCIBAR1 */
-#endif
        int enable_irq;
 };
 
 /*
  * This function looks for a board matching the supplied PCI device.
  */
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
 static const struct pc236_board *pc236_find_pci_board(struct pci_dev *pci_dev)
 {
        unsigned int i;
@@ -155,14 +150,12 @@ static const struct pc236_board *pc236_find_pci_board(struct pci_dev *pci_dev)
                        return &pc236_boards[i];
        return NULL;
 }
-#endif
 
 /*
  * This function looks for a PCI device matching the requested board name,
  * bus and slot.
  */
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
-struct pci_dev *
+static struct pci_dev *
 pc236_find_pci(struct comedi_device *dev, int bus, int slot)
 {
        const struct pc236_board *thisboard = comedi_board(dev);
@@ -207,13 +200,11 @@ pc236_find_pci(struct comedi_device *dev, int bus, int slot)
        }
        return NULL;
 }
-#endif
 
 /*
  * This function checks and requests an I/O region, reporting an error
  * if there is a conflict.
  */
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_ISA)
 static int pc236_request_region(struct comedi_device *dev, unsigned long from,
                                unsigned long extent)
 {
@@ -224,7 +215,6 @@ static int pc236_request_region(struct comedi_device *dev, unsigned long from,
        }
        return 0;
 }
-#endif
 
 /*
  * This function is called to mark the interrupt as disabled (no command
@@ -238,10 +228,8 @@ static void pc236_intr_disable(struct comedi_device *dev)
 
        spin_lock_irqsave(&dev->spinlock, flags);
        devpriv->enable_irq = 0;
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
-       if (devpriv->lcr_iobase)
+       if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI) && devpriv->lcr_iobase)
                outl(PCI236_INTR_DISABLE, devpriv->lcr_iobase + PLX9052_INTCSR);
-#endif
        spin_unlock_irqrestore(&dev->spinlock, flags);
 }
 
@@ -257,10 +245,8 @@ static void pc236_intr_enable(struct comedi_device *dev)
 
        spin_lock_irqsave(&dev->spinlock, flags);
        devpriv->enable_irq = 1;
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
-       if (devpriv->lcr_iobase)
+       if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI) && devpriv->lcr_iobase)
                outl(PCI236_INTR_ENABLE, devpriv->lcr_iobase + PLX9052_INTCSR);
-#endif
        spin_unlock_irqrestore(&dev->spinlock, flags);
 }
 
@@ -280,8 +266,8 @@ static int pc236_intr_check(struct comedi_device *dev)
        spin_lock_irqsave(&dev->spinlock, flags);
        if (devpriv->enable_irq) {
                retval = 1;
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
-               if (devpriv->lcr_iobase) {
+               if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI) &&
+                   devpriv->lcr_iobase) {
                        if ((inl(devpriv->lcr_iobase + PLX9052_INTCSR)
                             & PLX9052_INTCSR_LI1STAT_MASK)
                            == PLX9052_INTCSR_LI1STAT_INACTIVE) {
@@ -292,7 +278,6 @@ static int pc236_intr_check(struct comedi_device *dev)
                                     devpriv->lcr_iobase + PLX9052_INTCSR);
                        }
                }
-#endif
        }
        spin_unlock_irqrestore(&dev->spinlock, flags);
 
@@ -437,26 +422,18 @@ static void pc236_report_attach(struct comedi_device *dev, unsigned int irq)
        char tmpbuf[60];
        int tmplen;
 
-       switch (thisboard->bustype) {
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_ISA)
-       case isa_bustype:
+       if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_ISA) &&
+           thisboard->bustype == isa_bustype)
                tmplen = scnprintf(tmpbuf, sizeof(tmpbuf),
                                   "(base %#lx) ", dev->iobase);
-               break;
-#endif
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
-       case pci_bustype: {
-                       struct pc236_private *devpriv = dev->private;
-                       struct pci_dev *pci_dev = devpriv->pci_dev;
-                       tmplen = scnprintf(tmpbuf, sizeof(tmpbuf),
-                                          "(pci %s) ", pci_name(pci_dev));
-               }
-               break;
-#endif
-       default:
+       else if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI) &&
+                thisboard->bustype == pci_bustype) {
+               struct pc236_private *devpriv = dev->private;
+               struct pci_dev *pci_dev = devpriv->pci_dev;
+               tmplen = scnprintf(tmpbuf, sizeof(tmpbuf),
+                                  "(pci %s) ", pci_name(pci_dev));
+       } else
                tmplen = 0;
-               break;
-       }
        if (irq)
                tmplen += scnprintf(&tmpbuf[tmplen], sizeof(tmpbuf) - tmplen,
                                    "(irq %u%s) ", irq,
@@ -514,7 +491,6 @@ static int pc236_common_attach(struct comedi_device *dev, unsigned long iobase,
        return 1;
 }
 
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
 static int pc236_pci_common_attach(struct comedi_device *dev,
                                   struct pci_dev *pci_dev)
 {
@@ -533,7 +509,6 @@ static int pc236_pci_common_attach(struct comedi_device *dev,
        iobase = pci_resource_start(pci_dev, 2);
        return pc236_common_attach(dev, iobase, pci_dev->irq, IRQF_SHARED);
 }
-#endif
 
 /*
  * Attach is called by the Comedi core to configure the driver
@@ -553,37 +528,29 @@ static int pc236_attach(struct comedi_device *dev, struct comedi_devconfig *it)
                return ret;
        }
        /* Process options according to bus type. */
-       switch (thisboard->bustype) {
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_ISA)
-       case isa_bustype: {
-                       unsigned long iobase = it->options[0];
-                       unsigned int irq = it->options[1];
-                       ret = pc236_request_region(dev, iobase, PC236_IO_SIZE);
-                       if (ret < 0)
-                               return ret;
-                       return pc236_common_attach(dev, iobase, irq, 0);
-               }
-               break;
-#endif
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
-       case pci_bustype: {
-                       int bus = it->options[0];
-                       int slot = it->options[1];
-                       struct pci_dev *pci_dev;
-
-                       pci_dev = pc236_find_pci(dev, bus, slot);
-                       if (pci_dev == NULL)
-                               return -EIO;
-                       return pc236_pci_common_attach(dev, pci_dev);
-               }
-               break;
-#endif
-       default:
+       if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_ISA) &&
+           thisboard->bustype == isa_bustype) {
+               unsigned long iobase = it->options[0];
+               unsigned int irq = it->options[1];
+               ret = pc236_request_region(dev, iobase, PC236_IO_SIZE);
+               if (ret < 0)
+                       return ret;
+               return pc236_common_attach(dev, iobase, irq, 0);
+       } else if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI) &&
+                  thisboard->bustype == pci_bustype) {
+               int bus = it->options[0];
+               int slot = it->options[1];
+               struct pci_dev *pci_dev;
+
+               pci_dev = pc236_find_pci(dev, bus, slot);
+               if (pci_dev == NULL)
+                       return -EIO;
+               return pc236_pci_common_attach(dev, pci_dev);
+       } else {
                dev_err(dev->class_dev, PC236_DRIVER_NAME
                        ": BUG! cannot determine board type!\n");
-               break;
+               return -EINVAL;
        }
-       return -EINVAL;
 }
 
 /*
@@ -591,12 +558,14 @@ static int pc236_attach(struct comedi_device *dev, struct comedi_devconfig *it)
  * to the "manual" attach hook.  dev->board_ptr is NULL on entry.  There should
  * be a board entry matching the supplied PCI device.
  */
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
 static int __devinit pc236_attach_pci(struct comedi_device *dev,
                                      struct pci_dev *pci_dev)
 {
        int ret;
 
+       if (!IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI))
+               return -EINVAL;
+
        dev_info(dev->class_dev, PC236_DRIVER_NAME ": attach pci %s\n",
                 pci_name(pci_dev));
        ret = alloc_private(dev, sizeof(struct pc236_private));
@@ -611,7 +580,6 @@ static int __devinit pc236_attach_pci(struct comedi_device *dev,
        }
        return pc236_pci_common_attach(dev, pci_dev);
 }
-#endif
 
 static void pc236_detach(struct comedi_device *dev)
 {
@@ -624,18 +592,14 @@ static void pc236_detach(struct comedi_device *dev)
        if (dev->subdevices)
                subdev_8255_cleanup(dev, dev->subdevices + 0);
        if (devpriv) {
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
-               if (devpriv->pci_dev) {
+               if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI) &&
+                   devpriv->pci_dev) {
                        if (dev->iobase)
                                comedi_pci_disable(devpriv->pci_dev);
                        pci_dev_put(devpriv->pci_dev);
-               } else
-#endif
-               {
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_ISA)
+               } else if (IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_ISA)) {
                        if (dev->iobase)
                                release_region(dev->iobase, PC236_IO_SIZE);
-#endif
                }
        }
 }
@@ -650,9 +614,7 @@ static struct comedi_driver amplc_pc236_driver = {
        .driver_name = PC236_DRIVER_NAME,
        .module = THIS_MODULE,
        .attach = pc236_attach,
-#if IS_ENABLED(CONFIG_COMEDI_AMPLC_PC236_PCI)
        .attach_pci = pc236_attach_pci,
-#endif
        .detach = pc236_detach,
        .board_name = &pc236_boards[0].name,
        .offset = sizeof(struct pc236_board),