On 2013-12-03 19:07, H Hartley Sweeten wrote:
Do the request_irq() before setting up the subdevices. This removes an
indent level and makes the code a bit cleaner.
Also, remove the dev_warn() noise about the irq.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/me4000.c | 29 +++++++++++++----------------
1 file changed, 13 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/comedi/drivers/me4000.c b/drivers/staging/comedi/drivers/me4000.c
index 3d12e91..b7284d0 100644
--- a/drivers/staging/comedi/drivers/me4000.c
+++ b/drivers/staging/comedi/drivers/me4000.c
@@ -1505,6 +1505,13 @@ static int me4000_auto_attach(struct comedi_device *dev,
me4000_reset(dev);
+ if (pcidev->irq > 0) {
+ result = request_irq(pcidev->irq, me4000_ai_isr, IRQF_SHARED,
+ dev->board_name, dev);
+ if (result == 0)
+ dev->irq = pcidev->irq;
+ }
+
result = comedi_alloc_subdevices(dev, 4);
This will cause a NULL pointer dereference on the following line in
me4000_ai_isr():
struct comedi_subdevice *s = &dev->subdevices[0];
However, the bug gets fixed by your PATCH 20/51. (The later `if
(!dev->attached) return IRQ_NONE;` in the interrupt handler ensures it
does no further harm.)
if (result)
return result;
@@ -1525,22 +1532,12 @@ static int me4000_auto_attach(struct comedi_device *dev,
s->range_table = &me4000_ai_range;
s->insn_read = me4000_ai_insn_read;
- if (pcidev->irq > 0) {
- if (request_irq(pcidev->irq, me4000_ai_isr,
- IRQF_SHARED, dev->board_name, dev)) {
- dev_warn(dev->class_dev,
- "request_irq failed\n");
- } else {
- dev->read_subdev = s;
- s->subdev_flags |= SDF_CMD_READ;
- s->cancel = me4000_ai_cancel;
- s->do_cmdtest = me4000_ai_do_cmd_test;
- s->do_cmd = me4000_ai_do_cmd;
-
- dev->irq = pcidev->irq;
- }
- } else {
- dev_warn(dev->class_dev, "No interrupt available\n");
+ if (dev->irq) {
+ dev->read_subdev = s;
+ s->subdev_flags |= SDF_CMD_READ;
+ s->cancel = me4000_ai_cancel;
+ s->do_cmdtest = me4000_ai_do_cmd_test;
+ s->do_cmd = me4000_ai_do_cmd;
}
} else {
s->type = COMEDI_SUBD_UNUSED;
--
-=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@xxxxxxxxx> )=-
-=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=-
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