From nobody Mon Sep 29 22:45:03 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 09B6DC25B0D for ; Tue, 16 Aug 2022 04:37:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231211AbiHPEhT (ORCPT ); Tue, 16 Aug 2022 00:37:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56652 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230365AbiHPEgg (ORCPT ); Tue, 16 Aug 2022 00:36:36 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 104164D4D1; Mon, 15 Aug 2022 13:26:39 -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 A062560EE9; Mon, 15 Aug 2022 20:26:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 953FEC433D6; Mon, 15 Aug 2022 20:26:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660595198; bh=x7EQv7AD4LMoZ4EMaiSnO2H0ly6bAUK3LBIgSix3a/w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jroDEiiu8nzSsMXc56M0wfiiW3T7jcEjcfb5aINhiz1NDyN8D3/CRFeDkeBwEZXVu jCXu5tuzzM0urFx2ikQz/SMrqY0el/MNP7CG2Fuhq1nHDFp23nRW/3Uy5ScYbFPPp6 e6Li/060ARG/4zLa5+B7WMxR+W2qlqoH6Iyv3P+A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jonathan Cameron , Michael Welling , =?UTF-8?q?Nuno=20S=C3=A1?= , Sasha Levin Subject: [PATCH 5.19 0656/1157] iio: adc: mcp320x: Fix alignment for DMA safety Date: Mon, 15 Aug 2022 20:00:12 +0200 Message-Id: <20220815180505.977146149@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 e770f78036ce4327caf285873f4b20564a8b4f0f ] ____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. Worth noting the fixes tag refers to the same issue being observed on a platform that probably had only 64 byte cachelines. Fixes: 0e81bc99a082 ("iio: mcp320x: Fix occasional incorrect readings") Signed-off-by: Jonathan Cameron Cc: Michael Welling Acked-by: Nuno S=C3=A1 Link: https://lore.kernel.org/r/20220508175712.647246-28-jic23@kernel.org Signed-off-by: Sasha Levin --- drivers/iio/adc/mcp320x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iio/adc/mcp320x.c b/drivers/iio/adc/mcp320x.c index b4c69acb33e3..f3b81798b3c9 100644 --- a/drivers/iio/adc/mcp320x.c +++ b/drivers/iio/adc/mcp320x.c @@ -92,7 +92,7 @@ struct mcp320x { struct mutex lock; const struct mcp320x_chip_info *chip_info; =20 - u8 tx_buf ____cacheline_aligned; + u8 tx_buf __aligned(IIO_DMA_MINALIGN); u8 rx_buf[4]; }; =20 --=20 2.35.1