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From: Dmitry Rokosov <DDRokosov@sberdevices.ru>
To: "robh+dt@kernel.org" <robh+dt@kernel.org>,
	"jic23@kernel.org" <jic23@kernel.org>,
	"lars@metafoo.de" <lars@metafoo.de>,
	"andy.shevchenko@gmail.com" <andy.shevchenko@gmail.com>,
	"lorenzo.bianconi83@gmail.com" <lorenzo.bianconi83@gmail.com>,
	"linus.walleij@linaro.org" <linus.walleij@linaro.org>,
	"stephan@gerhold.net" <stephan@gerhold.net>,
	"hdegoede@redhat.com" <hdegoede@redhat.com>,
	"antoniu.miclaus@analog.com" <antoniu.miclaus@analog.com>,
	"sean@geanix.com" <sean@geanix.com>,
	"linmq006@gmail.com" <linmq006@gmail.com>,
	"gwendal@chromium.org" <gwendal@chromium.org>,
	"yangyingliang@huawei.com" <yangyingliang@huawei.com>
Cc: "linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
	kernel <kernel@sberdevices.ru>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Dmitry Rokosov <DDRokosov@sberdevices.ru>
Subject: [PATCH v1 3/5] iio:accel:mxc4005: rearrange iio trigger get and register
Date: Mon, 23 May 2022 16:41:48 +0000	[thread overview]
Message-ID: <20220523164159.11579-4-ddrokosov@sberdevices.ru> (raw)
In-Reply-To: <20220523164159.11579-1-ddrokosov@sberdevices.ru>

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/mxc4005.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/accel/mxc4005.c b/drivers/iio/accel/mxc4005.c
index b3afbf064915..df600d2917c0 100644
--- a/drivers/iio/accel/mxc4005.c
+++ b/drivers/iio/accel/mxc4005.c
@@ -456,8 +456,6 @@ static int mxc4005_probe(struct i2c_client *client,
 
 		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) {
@@ -465,6 +463,8 @@ 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);
-- 
2.36.0

  parent reply	other threads:[~2022-05-23 16:43 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-23 16:41 [PATCH v1 0/5] iio: treewide: rearrange iio trig get/register Dmitry Rokosov
2022-05-23 16:41 ` [PATCH v1 1/5] iio:accel:bma180: rearrange iio trigger get and register Dmitry Rokosov
2022-05-23 16:41 ` [PATCH v1 2/5] iio:accel:kxcjk-1013: " Dmitry Rokosov
2022-05-23 16:41 ` Dmitry Rokosov [this message]
2022-05-23 16:41 ` [PATCH v1 4/5] iio:chemical:ccs811: " Dmitry Rokosov
2022-05-23 17:40 ` [PATCH v1 0/5] iio: treewide: rearrange iio trig get/register Andy Shevchenko
2022-05-23 19:06   ` Dmitry Rokosov
2022-05-23 18:36 ` [PATCH v1 5/5] iio:humidity:hts221: rearrange iio trigger get and register Dmitry Rokosov

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