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Message-Id: <20220627111948.574719741@linuxfoundation.org>
Date: Mon, 27 Jun 2022 13:21:47 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Dmitry Rokosov <ddrokosov@...rdevices.ru>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Stable@...r.kernel.org,
Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.18 134/181] iio:accel:bma180: rearrange iio trigger get and register
From: Dmitry Rokosov <DDRokosov@...rdevices.ru>
commit e5f3205b04d7f95a2ef43bce4b454a7f264d6923 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: 0668a4e4d297 ("iio: accel: bma180: Fix indio_dev->trig assignment")
Signed-off-by: Dmitry Rokosov <ddrokosov@...rdevices.ru>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Link: https://lore.kernel.org/r/20220524181150.9240-2-ddrokosov@sberdevices.ru
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/iio/accel/bma180.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/iio/accel/bma180.c
+++ b/drivers/iio/accel/bma180.c
@@ -1006,11 +1006,12 @@ static int bma180_probe(struct i2c_clien
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,
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