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 92A42C433EF for ; Mon, 27 Jun 2022 11:34:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235755AbiF0Lee (ORCPT ); Mon, 27 Jun 2022 07:34:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235801AbiF0Lcp (ORCPT ); Mon, 27 Jun 2022 07:32:45 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 001CAB84E; Mon, 27 Jun 2022 04:29:41 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3F0BD614E6; Mon, 27 Jun 2022 11:29:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 365D9C3411D; Mon, 27 Jun 2022 11:29:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1656329379; bh=e5SxuUVBR5YTS1lsaIKWd96E4rewCB1yPA1mZtrYxBA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AWeWtBW/08IOOfIxeflalEhRf/nzHpGpOST7JUDQ5Kis2RlfjkakB9dVcRUjjSNBA kRMwH7hWMv/X03j28m8WknHP/fBenkuCOTOBjbmZK736LbkLeBk81x3DVTnscDhhdX AU52eAk2oKNNci/TFVI11LvyF3t0Bvn0ACJpL5U0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dmitry Rokosov , Andy Shevchenko , Stable@vger.kernel.org, Jonathan Cameron Subject: [PATCH 5.4 38/60] iio:chemical:ccs811: rearrange iio trigger get and register Date: Mon, 27 Jun 2022 13:21:49 +0200 Message-Id: <20220627111928.811227872@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220627111927.641837068@linuxfoundation.org> References: <20220627111927.641837068@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dmitry Rokosov 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 Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220524181150.9240-5-ddrokosov@sberdevices.ru Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- 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 @@ -418,11 +418,11 @@ 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,