From 6e6bed0b523717aa93f08ce8fe679a5c48c81cfd Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Mon, 9 Dec 2013 15:30:51 -0700 Subject: [PATCH] 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 Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/pcmmio.c | 37 +++++++-------------------------- 1 file changed, 7 insertions(+), 30 deletions(-) diff --git a/drivers/staging/comedi/drivers/pcmmio.c b/drivers/staging/comedi/drivers/pcmmio.c index 39dff77c3655..a31a2b796519 100644 --- 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); } -- 2.11.0