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 74837C433FE for ; Fri, 18 Mar 2022 12:16:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236107AbiCRMRz (ORCPT ); Fri, 18 Mar 2022 08:17:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54668 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236131AbiCRMRy (ORCPT ); Fri, 18 Mar 2022 08:17:54 -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 B3042F2103 for ; Fri, 18 Mar 2022 05:16:35 -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 5043361807 for ; Fri, 18 Mar 2022 12:16:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4048BC340E8; Fri, 18 Mar 2022 12:16:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1647605794; bh=BrVqYtO4whfjpzAbV1u170bw91NTJPdnPJ9V8iggfEY=; h=Subject:To:From:Date:From; b=xd33pWKFMrIJKU+P39DfqCveDa/b0qaSDzn57Sr2nBqBwhlNMPNT6dHjkhTXWtlsD JyRl8JEfL6jWEsAsSPxRjs3MIWdup7VrFVYnYjMiODb8IOSR0lQMfXCagYhVqcduMX NtK0V9c2KnoDDoUR0hMMKIESUNWLHta+nqwqaItU= Subject: patch "iio: accel: mma8452: use the correct logic to get mma8452_data" added to char-misc-next To: haibo.chen@nxp.com, Jonathan.Cameron@huawei.com, Stable@vger.kernel.org, martink@posteo.de From: Date: Fri, 18 Mar 2022 12:46:39 +0100 Message-ID: <1647603999155183@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This is a note to let you know that I've just added the patch titled iio: accel: mma8452: use the correct logic to get mma8452_data to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-next branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will also be merged in the next major kernel release during the merge window. If you have any questions about this process, please let me know. >From c87b7b12f48db86ac9909894f4dc0107d7df6375 Mon Sep 17 00:00:00 2001 From: Haibo Chen Date: Tue, 22 Feb 2022 10:42:21 +0800 Subject: iio: accel: mma8452: use the correct logic to get mma8452_data The original logic to get mma8452_data is wrong, the *dev point to the device belong to iio_dev. we can't use this dev to find the correct i2c_client. The original logic happen to work because it finally use dev->driver_data to get iio_dev. Here use the API to_i2c_client() is wrong and make reader confuse. To correct the logic, it should be like this struct mma8452_data *data = iio_priv(dev_get_drvdata(dev)); But after commit 8b7651f25962 ("iio: iio_device_alloc(): Remove unnecessary self drvdata"), the upper logic also can't work. When try to show the avialable scale in userspace, will meet kernel dump, kernel handle NULL pointer dereference. So use dev_to_iio_dev() to correct the logic. Dual fixes tags as the second reflects when the bug was exposed, whilst the first reflects when the original bug was introduced. Fixes: c3cdd6e48e35 ("iio: mma8452: refactor for seperating chip specific data") Fixes: 8b7651f25962 ("iio: iio_device_alloc(): Remove unnecessary self drvdata") Signed-off-by: Haibo Chen Reviewed-by: Martin Kepplinger Cc: Link: https://lore.kernel.org/r/1645497741-5402-1-git-send-email-haibo.chen@nxp.com Signed-off-by: Jonathan Cameron --- drivers/iio/accel/mma8452.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c index 6ea10700d048..9c02c681c84c 100644 --- a/drivers/iio/accel/mma8452.c +++ b/drivers/iio/accel/mma8452.c @@ -381,8 +381,8 @@ static ssize_t mma8452_show_scale_avail(struct device *dev, struct device_attribute *attr, char *buf) { - struct mma8452_data *data = iio_priv(i2c_get_clientdata( - to_i2c_client(dev))); + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct mma8452_data *data = iio_priv(indio_dev); return mma8452_show_int_plus_micros(buf, data->chip_info->mma_scales, ARRAY_SIZE(data->chip_info->mma_scales)); -- 2.35.1