diff options
| author |   Dmitry Rokosov <DDRokosov@sberdevices.ru> | 2022-05-24 18:14:43 +0000 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-29 08:58:48 +0200 |
| commit | a391bced840437f9161ed09a4851f80a4212aa42 (patch) | |
| tree | 99fa1de9473357feed75dc971a7eb2b7b9c1b5bf | |
| parent | iio:accel:bma180: rearrange iio trigger get and register (diff) | |
| download | wireguard-linux-a391bced840437f9161ed09a4851f80a4212aa42.tar.xz wireguard-linux-a391bced840437f9161ed09a4851f80a4212aa42.zip | |
iio:accel:mxc4005: rearrange iio trigger get and register
commit 9354c224c9b4f55847a0de3e968cba2ebf15af3b upstream.
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
callback or "delete module" path) will dereference "default" module
refcnt, which is incorrect behaviour.
Fixes: 47196620c82f ("iio: mxc4005: add data ready trigger for mxc4005")
Signed-off-by: Dmitry Rokosov <ddrokosov@sberdevices.ru>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220524181150.9240-4-ddrokosov@sberdevices.ru
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/iio/accel/mxc4005.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iio/accel/mxc4005.c b/drivers/iio/accel/mxc4005.c index d81b02642a0b..110b7ea76ef2 100644 --- a/drivers/iio/accel/mxc4005.c +++ b/drivers/iio/accel/mxc4005.c @@ -462,8 +462,6 @@ static int mxc4005_probe(struct i2c_client *client, data->dready_trig->dev.parent = &client->dev; data->dready_trig->ops = &mxc4005_trigger_ops; iio_trigger_set_drvdata(data->dready_trig, indio_dev); - indio_dev->trig = data->dready_trig; - iio_trigger_get(indio_dev->trig); ret = devm_iio_trigger_register(&client->dev, data->dready_trig); if (ret) { @@ -471,6 +469,8 @@ static int mxc4005_probe(struct i2c_client *client, "failed to register trigger\n"); return ret; } + + indio_dev->trig = iio_trigger_get(data->dready_trig); } return devm_iio_device_register(&client->dev, indio_dev); |