diff options
| author |   Dmitry Rokosov <DDRokosov@sberdevices.ru> | 2022-05-24 18:14:45 +0000 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-29 08:58:47 +0200 |
| commit | 8ea16a64aafc3045d52952030ac900054bc94c72 (patch) | |
| tree | 3af33821ad1146510648d3949988e6a1db08f45e | |
| parent | usb: chipidea: udc: check request status before setting device address (diff) | |
| download | wireguard-linux-8ea16a64aafc3045d52952030ac900054bc94c72.tar.xz wireguard-linux-8ea16a64aafc3045d52952030ac900054bc94c72.zip | |
iio:chemical:ccs811: rearrange iio trigger get and register
commit d710359c0b445e8c03e24f19ae2fb79ce7282260 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: f1f065d7ac30 ("iio: chemical: ccs811: Add support for data ready trigger")
Signed-off-by: Dmitry Rokosov <ddrokosov@sberdevices.ru>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220524181150.9240-5-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/chemical/ccs811.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iio/chemical/ccs811.c b/drivers/iio/chemical/ccs811.c index 7bf4e9a16a6a..a2ee6bbda7f4 100644 --- a/drivers/iio/chemical/ccs811.c +++ b/drivers/iio/chemical/ccs811.c @@ -418,11 +418,11 @@ static int ccs811_probe(struct i2c_client *client, data->drdy_trig->dev.parent = &client->dev; data->drdy_trig->ops = &ccs811_trigger_ops; iio_trigger_set_drvdata(data->drdy_trig, indio_dev); - indio_dev->trig = data->drdy_trig; - iio_trigger_get(indio_dev->trig); ret = iio_trigger_register(data->drdy_trig); if (ret) goto err_poweroff; + + indio_dev->trig = iio_trigger_get(data->drdy_trig); } ret = iio_triggered_buffer_setup(indio_dev, NULL, |