evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

staging: comedi: pcmmio: tidy up the irq request

Browse source 
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>
This commit is contained in:
H Hartley Sweeten 2013-12-09 15:30:51 -07:00 • committed by Greg Kroah-Hartman
parent 5d4997bbfa
commit 6e6bed0b52
1 changed files with 7 additions and 30 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

37
drivers/staging/comedi/drivers/pcmmio.c
View file

@ -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);
}