From nobody Mon Sep 29 22:42:47 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 685F7C25B0D for ; Tue, 16 Aug 2022 04:38:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231301AbiHPEh7 (ORCPT ); Tue, 16 Aug 2022 00:37:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36948 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231267AbiHPEg6 (ORCPT ); Tue, 16 Aug 2022 00:36:58 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D737E9C8D1; Mon, 15 Aug 2022 13:26:56 -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 8AD8DB81197; Mon, 15 Aug 2022 20:26:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB349C433D6; Mon, 15 Aug 2022 20:26:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660595214; bh=VIEVbCtvRfjrQKPCYjdDan+CnTB02T8MRrjk4iIJJi0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TkW4vEYJT79Abur5fww3uxkfr0hduvyVKGtAYWJMnuq65jn5yWlx4pAut6SLb9NC2 /K2WJM392+OLO4kJ13FwCYfUvVrNHSEUIRUCensaAcNkrZYZSjHfd+7sAV6bw3jyf9 l7YBqqV6QydGxjmNI0yHP98B3whK05zvQqh90nEY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jonathan Cameron , Michael Hennerich , =?UTF-8?q?Nuno=20S=C3=A1?= , Sasha Levin Subject: [PATCH 5.19 0651/1157] iio: adc: ltc2497: Fix alignment for DMA safety Date: Mon, 15 Aug 2022 20:00:07 +0200 Message-Id: <20220815180505.785360769@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 6ebf401d555ee1e75e779b865d38e171db0aa1f2 ] ____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: bc82222fcca1 ("iio:adc: Driver for Linear Technology LTC2497 ADC") Signed-off-by: Jonathan Cameron Cc: Michael Hennerich Acked-by: Nuno S=C3=A1 Link: https://lore.kernel.org/r/20220508175712.647246-23-jic23@kernel.org Signed-off-by: Sasha Levin --- drivers/iio/adc/ltc2497.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c index 1adddf5a88a9..f7c786f37ceb 100644 --- a/drivers/iio/adc/ltc2497.c +++ b/drivers/iio/adc/ltc2497.c @@ -20,10 +20,10 @@ struct ltc2497_driverdata { struct ltc2497core_driverdata common_ddata; struct i2c_client *client; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */ - __be32 buf ____cacheline_aligned; + __be32 buf __aligned(IIO_DMA_MINALIGN); }; =20 static int ltc2497_result_and_measure(struct ltc2497core_driverdata *ddata, --=20 2.35.1