staging: comedi: pcmmio: tidy up the irq request

The for () loop that does the request_irq() in this driver is a bit of
an overkill. The code appears to have been copied from the pcmuio driver
which supports boards with 1 or 2 ASIC devices. The board supported by
this driver only has 1 ASIC.

Simplify the code and store the irq number in the comedi_device. This
allows the core to automatically do the free_irq() when the driver is
detached.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/pcmmio.c b/drivers/staging/comedi/drivers/pcmmio.c
index 39dff77..a31a2b7 100644 (file)
--- a/drivers/staging/comedi/drivers/pcmmio.c
+++ b/drivers/staging/comedi/drivers/pcmmio.c
@@ -276,7 +276,6 @@ struct pcmmio_private {
                unsigned char enab[NUM_PAGED_REGS];
                int num;
                unsigned long iobase;
-               unsigned int irq;
                spinlock_t spinlock;
        } asics[MAX_ASICS];
        struct pcmmio_subdev_private *sprivs;
@@ -440,7 +439,7 @@ static irqreturn_t interrupt_pcmmio(int irq, void *d)
        int i;
 
        for (asic = 0; asic < MAX_ASICS; ++asic) {
-               if (irq == devpriv->asics[asic].irq) {
+               if (irq == dev->irq) {
                        unsigned long flags;
                        unsigned triggered = 0;
                        unsigned long iobase = devpriv->asics[asic].iobase;
@@ -964,11 +963,8 @@ static int pcmmio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
        struct comedi_subdevice *s;
        int sdev_no, chans_left, n_dio_subdevs, n_subdevs, port, asic,
            thisasic_chanct = 0;
-       unsigned int irq[MAX_ASICS];
        int ret;
 
-       irq[0] = it->options[1];
-
        ret = comedi_request_region(dev, it->options[0], 32);
        if (ret)
                return ret;
@@ -981,11 +977,6 @@ static int pcmmio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
                devpriv->asics[asic].num = asic;
                devpriv->asics[asic].iobase =
                    dev->iobase + 16 + asic * ASIC_IOSIZE;
-               /*
-                * this gets actually set at the end of this function when we
-                * request_irqs
-                */
-               devpriv->asics[asic].irq = 0;
                spin_lock_init(&devpriv->asics[asic].spinlock);
        }
 
@@ -1102,19 +1093,11 @@ static int pcmmio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 
        init_asics(dev);        /* clear out all the registers, basically */
 
-       for (asic = 0; irq[0] && asic < MAX_ASICS; ++asic) {
-               if (irq[asic]
-                   && request_irq(irq[asic], interrupt_pcmmio,
-                                  IRQF_SHARED, dev->board_name, dev)) {
-                       int i;
-                       /* unroll the allocated irqs.. */
-                       for (i = asic - 1; i >= 0; --i) {
-                               free_irq(irq[i], dev);
-                               devpriv->asics[i].irq = irq[i] = 0;
-                       }
-                       irq[asic] = 0;
-               }
-               devpriv->asics[asic].irq = irq[asic];
+       if (it->options[1]) {
+               ret = request_irq(it->options[1], interrupt_pcmmio, 0,
+                                 dev->board_name, dev);
+               if (ret == 0)
+                       dev->irq = it->options[1];
        }
 
        return 1;
@@ -1123,15 +1106,9 @@ static int pcmmio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 static void pcmmio_detach(struct comedi_device *dev)
 {
        struct pcmmio_private *devpriv = dev->private;
-       int i;
 
-       if (devpriv) {
-               for (i = 0; i < MAX_ASICS; ++i) {
-                       if (devpriv->asics[i].irq)
-                               free_irq(devpriv->asics[i].irq, dev);
-               }
+       if (devpriv)
                kfree(devpriv->sprivs);
-       }
        comedi_legacy_detach(dev);
 }