When attaching a pollfunc iio_trigger_attach_poll_func will allocate a
virtual irq and call the driver's set_trigger_state function. Fix error
handling to release the irq if set_trigger_state fails.
Otherwise when using triggered buffers and the driver's
set_trigger_state fails once then the buffer becomes unusable.
It is not possible to handle this sort of error by calling
iio_trigger_detach_poll_func externally somehow. That function should
only be called if attach is successful.
Signed-off-by: Crestez Dan Leonard <leonard.crestez@xxxxxxxxx>
---
I ran into this while adding some validation in driver's set_trigger_state
function. It's much better to use buffer_ops->predisable for that kind of stuff
but the iio core should still handle set_trigger_state errors correctly.
drivers/iio/industrialio-trigger.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
index ae2806a..cf2be3e 100644
--- a/drivers/iio/industrialio-trigger.c
+++ b/drivers/iio/industrialio-trigger.c
@@ -214,18 +214,23 @@ static int iio_trigger_attach_poll_func(struct iio_trigger *trig,
ret = request_threaded_irq(pf->irq, pf->h, pf->thread,
pf->type, pf->name,
pf);
- if (ret < 0) {
- module_put(pf->indio_dev->info->driver_module);
- return ret;
- }
+ if (ret < 0)
+ goto out_put_module;
if (trig->ops && trig->ops->set_trigger_state && notinuse) {
ret = trig->ops->set_trigger_state(trig, true);
if (ret < 0)
- module_put(pf->indio_dev->info->driver_module);
+ goto out_put_irq;
}
return ret;
+
+out_put_irq:
+ iio_trigger_put_irq(trig, pf->irq);
+ free_irq(pf->irq, pf);
+out_put_module:
+ module_put(pf->indio_dev->info->driver_module);
+ return ret;
}
static int iio_trigger_detach_poll_func(struct iio_trigger *trig,
--
2.5.5
--
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