Messages in this thread Patch in this message | | | From | Dmitry Rokosov <> | Subject | [PATCH v1 1/5] iio:accel:bma180: rearrange iio trigger get and register | Date | Mon, 23 May 2022 16:41:43 +0000 |
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IIO trigger interface function iio_trigger_get() should be called after iio_trigger_register() (or its devm analogue) strictly, because of iio_trigger_get() acquires module refcnt based on the trigger->owner pointer, which is initialized inside iio_trigger_register() to THIS_MODULE. If this call order is wrong, the next iio_trigger_put() (from sysfs callbacks or rmmod) will derefence "default" module refcnt, which is completely incorrect.
Signed-off-by: Dmitry Rokosov <ddrokosov@sberdevices.ru> --- drivers/iio/accel/bma180.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c index d8a454c266d5..5d0bd0fc3018 100644 --- a/drivers/iio/accel/bma180.c +++ b/drivers/iio/accel/bma180.c @@ -1006,11 +1006,12 @@ static int bma180_probe(struct i2c_client *client, data->trig->ops = &bma180_trigger_ops; iio_trigger_set_drvdata(data->trig, indio_dev); - indio_dev->trig = iio_trigger_get(data->trig); ret = iio_trigger_register(data->trig); if (ret) goto err_trigger_free; + + indio_dev->trig = iio_trigger_get(data->trig); } ret = iio_triggered_buffer_setup(indio_dev, NULL, -- 2.36.0
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