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    Subject[PATCH 5.10 073/102] iio:chemical:ccs811: rearrange iio trigger get and register
    Date
    From: Dmitry Rokosov <DDRokosov@sberdevices.ru>

    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>
    ---
    drivers/iio/chemical/ccs811.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/drivers/iio/chemical/ccs811.c
    +++ b/drivers/iio/chemical/ccs811.c
    @@ -500,11 +500,11 @@ static int ccs811_probe(struct i2c_clien
    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,

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