From nobody Mon Sep 29 21:20:48 2025 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 78C82C25B08 for ; Tue, 16 Aug 2022 00:14:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357426AbiHPANe (ORCPT ); Mon, 15 Aug 2022 20:13:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48878 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357140AbiHPADt (ORCPT ); Mon, 15 Aug 2022 20:03:49 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2CF759A9B2; Mon, 15 Aug 2022 13:25:46 -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 7C17CB8119E; Mon, 15 Aug 2022 20:25:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C162DC433C1; Mon, 15 Aug 2022 20:25:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660595143; bh=/abWgxfwLHAtA6csyAuy8ia+oSqJcSA0RuGdE9gcwn8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UM4FEs9KYSIRSh1Z5qu60Ve58L2YGoYAy1EhZqGH2BmksQj2Gisl64TOjpeLgZzTu GJf4vsKyuQiLpgoxdOTur6SpN73UiBjZN9isWc3gE11ESy+O2dIz/+Hpl+IfUcZ9xu i/6mpbHEOhDb7EsiKah6jFRH56cHEedvNHWMW0zg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jonathan Cameron , Jacopo Mondi , =?UTF-8?q?Nuno=20S=C3=A1?= , Sasha Levin Subject: [PATCH 5.19 0653/1157] iio: adc: max11100: Fix alignment for DMA safety Date: Mon, 15 Aug 2022 20:00:09 +0200 Message-Id: <20220815180505.873123411@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180439.416659447@linuxfoundation.org> References: <20220815180439.416659447@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jonathan Cameron [ Upstream commit 51f30d63145cc84cb8a8e0ec96f9a8b73e6b5448 ] ____cacheline_aligned is an insufficient guarantee for non-coherent DMA on platforms with 128 byte cachelines above L1. Switch to the updated IIO_DMA_MINALIGN definition. Update the comment to include 'may'. Fixes: a8e7e88df9ec ("iio: adc: Add Maxim MAX11100 driver") Signed-off-by: Jonathan Cameron Acked-by: Jacopo Mondi Acked-by: Nuno S=C3=A1 Link: https://lore.kernel.org/r/20220508175712.647246-25-jic23@kernel.org Signed-off-by: Sasha Levin --- drivers/iio/adc/max11100.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/max11100.c b/drivers/iio/adc/max11100.c index eb1ce6a0315c..49e38dca8fe2 100644 --- a/drivers/iio/adc/max11100.c +++ b/drivers/iio/adc/max11100.c @@ -33,10 +33,10 @@ struct max11100_state { struct spi_device *spi; =20 /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */ - u8 buffer[3] ____cacheline_aligned; + u8 buffer[3] __aligned(IIO_DMA_MINALIGN); }; =20 static const struct iio_chan_spec max11100_channels[] =3D { --=20 2.35.1