From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EDEFC433FE for ; Tue, 24 May 2022 18:15:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240280AbiEXSPE (ORCPT ); Tue, 24 May 2022 14:15:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33990 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233757AbiEXSO7 (ORCPT ); Tue, 24 May 2022 14:14:59 -0400 Received: from mail.sberdevices.ru (mail.sberdevices.ru [45.89.227.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA6F569702; Tue, 24 May 2022 11:14:53 -0700 (PDT) Received: from s-lin-edge02.sberdevices.ru (localhost [127.0.0.1]) by mail.sberdevices.ru (Postfix) with ESMTP id A6E6B5FD08; Tue, 24 May 2022 21:14:51 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sberdevices.ru; s=mail; t=1653416091; bh=wD7xCf5kPvxtcNl5Q5TxVB7RgfbUWeGyNLGzYEBaNHI=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=CTOUnzjn/ACJVkoRa975ESziYQa1zuKoHYBFncmfreyqQv8h4KbmjZz6tO2KLA81h 8pO5BrB7YJkROPMl7IDWMwWHfspkqPe2Z4mmDuVVXsQYd7zQsUKiV94ybmI+yemrkD B055bpRtvmx5/Aosl2NIP8lDkKtgs3LBBI3RRQQpuVHnGCNrmE1Pu1M/POEUvYSaIX NDD4kzZDwmyTtgUFHsBV0sIKVUkweDHKmtSxHxPxuofI4gLVKalQo6DkQifQG7IQUj 4z8nqM5tleaJeKUrXgVhZdR+ozXjmtECKlnuo6tHyFyEcmJa/2UDOyWbOwAoDrWWCr VJzn1WQv6gSfg== Received: from S-MS-EXCH01.sberdevices.ru (S-MS-EXCH01.sberdevices.ru [172.16.1.4]) by mail.sberdevices.ru (Postfix) with ESMTP; Tue, 24 May 2022 21:14:51 +0300 (MSK) From: Dmitry Rokosov To: "robh+dt@kernel.org" , "jic23@kernel.org" , "lars@metafoo.de" , "andy.shevchenko@gmail.com" , "lorenzo.bianconi83@gmail.com" , "srinivas.pandruvada@linux.intel.com" , "teodora.baluta@intel.com" , "narcisaanamaria12@gmail.com" CC: "linux-iio@vger.kernel.org" , kernel , "linux-kernel@vger.kernel.org" , Dmitry Rokosov Subject: [PATCH v2 3/5] iio:accel:mxc4005: rearrange iio trigger get and register Thread-Topic: [PATCH v2 3/5] iio:accel:mxc4005: rearrange iio trigger get and register Thread-Index: AQHYb5okhfALIwJfFkukmT/Sx6kzbg== Date: Tue, 24 May 2022 18:14:43 +0000 Message-ID: <20220524181150.9240-4-ddrokosov@sberdevices.ru> References: <20220524181150.9240-1-ddrokosov@sberdevices.ru> In-Reply-To: <20220524181150.9240-1-ddrokosov@sberdevices.ru> Accept-Language: ru-RU, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [172.16.1.12] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-KSMG-Rule-ID: 4 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Status: not scanned, disabled by settings X-KSMG-AntiSpam-Interceptor-Info: not scanned X-KSMG-AntiPhishing: not scanned, disabled by settings X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 1.1.2.30, bases: 2022/05/24 14:34:00 #19560786 X-KSMG-AntiVirus-Status: Clean, skipped Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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, =20 data->dready_trig->ops =3D &mxc4005_trigger_ops; iio_trigger_set_drvdata(data->dready_trig, indio_dev); - indio_dev->trig =3D data->dready_trig; - iio_trigger_get(indio_dev->trig); ret =3D 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 =3D iio_trigger_get(data->dready_trig); } =20 return devm_iio_device_register(&client->dev, indio_dev); --=20 2.36.0