On 2013-10-01 23:14, H Hartley Sweeten wrote:
Do the request_irq() before setting up the subdevices. Only initialize
the interrupt subdevice if the irq is actually available.
Since it's using IRQ_SHARED, you'll need add a test to the start of
ni6527_interrupt() to check dev->attached before accessing the subdevice:
if (!dev->attached)
return IRQ_NONE;
Tidy up the whitespace in the subdevice init.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/ni_6527.c | 39 +++++++++++++++++---------------
1 file changed, 21 insertions(+), 18 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_6527.c b/drivers/staging/comedi/drivers/ni_6527.c
index 7ad8a4b..af35b78 100644
--- a/drivers/staging/comedi/drivers/ni_6527.c
+++ b/drivers/staging/comedi/drivers/ni_6527.c
@@ -381,6 +381,11 @@ static int ni6527_auto_attach(struct comedi_device *dev,
ni6527_reset(dev);
+ ret = request_irq(pcidev->irq, ni6527_interrupt, IRQF_SHARED,
+ dev->board_name, dev);
+ if (ret == 0)
+ dev->irq = pcidev->irq;
+
ret = comedi_alloc_subdevices(dev, 3);
if (ret)
return ret;
@@ -402,25 +407,23 @@ static int ni6527_auto_attach(struct comedi_device *dev,
s->maxdata = 1;
s->insn_bits = ni6527_do_insn_bits;
+ /* Edge detection interrupt subdevice */
s = &dev->subdevices[2];
- dev->read_subdev = s;
- s->type = COMEDI_SUBD_DI;
- s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
- s->n_chan = 1;
- s->range_table = &range_unknown;
- s->maxdata = 1;
- s->do_cmdtest = ni6527_intr_cmdtest;
- s->do_cmd = ni6527_intr_cmd;
- s->cancel = ni6527_intr_cancel;
- s->insn_bits = ni6527_intr_insn_bits;
- s->insn_config = ni6527_intr_insn_config;
-
- ret = request_irq(pcidev->irq, ni6527_interrupt,
- IRQF_SHARED, dev->board_name, dev);
- if (ret < 0)
- dev_warn(dev->class_dev, "irq not available\n");
- else
- dev->irq = pcidev->irq;
+ if (dev->irq) {
+ dev->read_subdev = s;
+ s->type = COMEDI_SUBD_DI;
+ s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
+ s->n_chan = 1;
+ s->maxdata = 1;
+ s->range_table = &range_digital;
+ s->insn_config = ni6527_intr_insn_config;
+ s->insn_bits = ni6527_intr_insn_bits;
+ s->do_cmdtest = ni6527_intr_cmdtest;
+ s->do_cmd = ni6527_intr_cmd;
+ s->cancel = ni6527_intr_cancel;
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
return 0;
}
--
-=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@xxxxxxxxx> )=-
-=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=-
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