The async command support requires an irq. Only initialize the subdevice
command support if the request_irq was successfull.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/das1800.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/drivers/staging/comedi/drivers/das1800.c
b/drivers/staging/comedi/drivers/das1800.c
index a913787..c82de28 100644
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -1568,20 +1568,23 @@ static int das1800_attach(struct comedi_device *dev,
/* analog input subdevice */
s = &dev->subdevices[0];
- dev->read_subdev = s;
s->type = COMEDI_SUBD_AI;
- s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
+ s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND;
if (thisboard->common)
s->subdev_flags |= SDF_COMMON;
s->n_chan = thisboard->qram_len;
- s->len_chanlist = thisboard->qram_len;
s->maxdata = (1 << thisboard->resolution) - 1;
s->range_table = thisboard->range_ai;
- s->do_cmd = das1800_ai_do_cmd;
- s->do_cmdtest = das1800_ai_do_cmdtest;
s->insn_read = das1800_ai_rinsn;
- s->poll = das1800_ai_poll;
- s->cancel = das1800_cancel;
+ if (dev->irq) {
+ dev->read_subdev = s;
+ s->subdev_flags |= SDF_CMD_READ;
+ s->len_chanlist = s->n_chan;
+ s->do_cmd = das1800_ai_do_cmd;
+ s->do_cmdtest = das1800_ai_do_cmdtest;
+ s->poll = das1800_ai_poll;
+ s->cancel = das1800_cancel;
+ }
/* analog out */
s = &dev->subdevices[1];
--
1.8.4.4
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