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 A826DCCA473 for ; Mon, 27 Jun 2022 11:43:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237193AbiF0Lmd (ORCPT ); Mon, 27 Jun 2022 07:42:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34884 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236871AbiF0LkH (ORCPT ); Mon, 27 Jun 2022 07:40:07 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6AE0BF49; Mon, 27 Jun 2022 04:35:27 -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 ams.source.kernel.org (Postfix) with ESMTPS id 4EC36B8111C; Mon, 27 Jun 2022 11:35:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 99C3CC341CB; Mon, 27 Jun 2022 11:35:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1656329725; bh=BNLFPZpsAc5Nj2RvB66h6RKzrBanhSoyZjQoghUykW8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=y78m9MJqcjbXz+xIiF+pZMIoUPtS6B+12dnhPsizQiyVlTzJcLUTZqRQcry89VE08 3XSlbnPtGZ5UQNf+IwltT2RQlGHtwmqNKeGFOQ0NtZ+939sQv2NJyDlSuM6PpRmZwB 8cs82p1gUGOsJm7ABQ/dIvrcv9F0D2R2LFgSOE10= 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 5.15 095/135] iio:humidity:hts221: rearrange iio trigger get and register Date: Mon, 27 Jun 2022 13:21:42 +0200 Message-Id: <20220627111940.914424368@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220627111938.151743692@linuxfoundation.org> References: <20220627111938.151743692@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: linux-kernel@vger.kernel.org From: Dmitry Rokosov commit 10b9c2c33ac706face458feab8965f11743c98c0 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: e4a70e3e7d84 ("iio: humidity: add support to hts221 rh/temp combo device") Signed-off-by: Dmitry Rokosov Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220524181150.9240-6-ddrokosov@sberdevices.ru Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/humidity/hts221_buffer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/iio/humidity/hts221_buffer.c +++ b/drivers/iio/humidity/hts221_buffer.c @@ -135,9 +135,12 @@ int hts221_allocate_trigger(struct iio_d iio_trigger_set_drvdata(hw->trig, iio_dev); hw->trig->ops = &hts221_trigger_ops; + + err = devm_iio_trigger_register(hw->dev, hw->trig); + iio_dev->trig = iio_trigger_get(hw->trig); - return devm_iio_trigger_register(hw->dev, hw->trig); + return err; } static int hts221_buffer_preenable(struct iio_dev *iio_dev)