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 X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 666B3C11F69 for ; Mon, 12 Jul 2021 07:18:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A74061490 for ; Mon, 12 Jul 2021 07:18:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344688AbhGLHUo (ORCPT ); Mon, 12 Jul 2021 03:20:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:49170 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239054AbhGLGt2 (ORCPT ); Mon, 12 Jul 2021 02:49:28 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id CC5EB60FD8; Mon, 12 Jul 2021 06:45:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626072347; bh=mwf9hJLWPNOdLFUEIsrdC1GGvFET8eaxuSIu33tcvkM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Mb9jnr2Qry6f5sMCZ+N8/wiu68mS2WRcUZOajOf5/J75Qqug0yP8kuLBdx2WcAkVJ bC/J6U+BuneOkL9TZI+ZYXW2wVGpLBDSn9pcBpbtNDP944SfS5iNJBmk/9233/qBBt 4LY5MyggR1S968aGGi2BEwvMveFA+FVAmfgX5Q00= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jonathan Cameron , Matt Ranostay , Andy Shevchenko , Sasha Levin Subject: [PATCH 5.10 458/593] iio: prox: as3935: Fix buffer alignment in iio_push_to_buffers_with_timestamp() Date: Mon, 12 Jul 2021 08:10:18 +0200 Message-Id: <20210712060939.837630603@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060843.180606720@linuxfoundation.org> References: <20210712060843.180606720@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: Jonathan Cameron [ Upstream commit 37eb8d8c64f2ecb3a5521ba1cc1fad973adfae41 ] To make code more readable, use a structure to express the channel layout and ensure the timestamp is 8 byte aligned. Found during an audit of all calls of uses of iio_push_to_buffers_with_timestamp() Fixes: 37b1ba2c68cf ("iio: proximity: as3935: fix buffer stack trashing") Signed-off-by: Jonathan Cameron Cc: Matt Ranostay Acked-by: Matt Ranostay Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20210501170121.512209-15-jic23@kernel.org Signed-off-by: Sasha Levin --- drivers/iio/proximity/as3935.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/iio/proximity/as3935.c b/drivers/iio/proximity/as3935.c index b79ada839e01..98330e26ac3b 100644 --- a/drivers/iio/proximity/as3935.c +++ b/drivers/iio/proximity/as3935.c @@ -59,7 +59,11 @@ struct as3935_state { unsigned long noise_tripped; u32 tune_cap; u32 nflwdth_reg; - u8 buffer[16]; /* 8-bit data + 56-bit padding + 64-bit timestamp */ + /* Ensure timestamp is naturally aligned */ + struct { + u8 chan; + s64 timestamp __aligned(8); + } scan; u8 buf[2] ____cacheline_aligned; }; @@ -225,8 +229,8 @@ static irqreturn_t as3935_trigger_handler(int irq, void *private) if (ret) goto err_read; - st->buffer[0] = val & AS3935_DATA_MASK; - iio_push_to_buffers_with_timestamp(indio_dev, &st->buffer, + st->scan.chan = val & AS3935_DATA_MASK; + iio_push_to_buffers_with_timestamp(indio_dev, &st->scan, iio_get_time_ns(indio_dev)); err_read: iio_trigger_notify_done(indio_dev->trig); -- 2.30.2