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=-7.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 A5D1EECE561 for ; Mon, 24 Sep 2018 14:51:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 47A722098A for ; Mon, 24 Sep 2018 14:51:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=microsoft.com header.i=@microsoft.com header.b="NyfzNu9z" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 47A722098A Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=microsoft.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388820AbeIXUxf (ORCPT ); Mon, 24 Sep 2018 16:53:35 -0400 Received: from mail-by2nam03on0094.outbound.protection.outlook.com ([104.47.42.94]:22973 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730084AbeIXUxe (ORCPT ); Mon, 24 Sep 2018 16:53:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=2EQvxnxV9Im7I6t3phX96Kh3moA+/lOiAjdKPdhsaGg=; b=NyfzNu9z9QW6BlxQEcJzPn21BoTy2p920KCFPzU0hyLg6SopSzjNkKfAxnRFJYro2PkHvIv65hrkB36dc/Fl/ydFmdohcqCRJEIUNmULvxI/RnZ2fojJWViSRW53JxmJgCJZ4AkviERes9TqWo5sU21U5i6ivwuB4Tc3gBe0I8g= Received: from CY4PR21MB0776.namprd21.prod.outlook.com (10.173.192.22) by CY4PR21MB0181.namprd21.prod.outlook.com (10.173.193.7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1207.3; Mon, 24 Sep 2018 14:51:00 +0000 Received: from CY4PR21MB0776.namprd21.prod.outlook.com ([fe80::54e2:88e0:b622:b36]) by CY4PR21MB0776.namprd21.prod.outlook.com ([fe80::54e2:88e0:b622:b36%5]) with mapi id 15.20.1207.003; Mon, 24 Sep 2018 14:51:00 +0000 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Masahiro Yamada , Wolfram Sang , Sasha Levin Subject: [PATCH AUTOSEL 4.9 13/23] i2c: uniphier: issue STOP only for last message or I2C_M_STOP Thread-Topic: [PATCH AUTOSEL 4.9 13/23] i2c: uniphier: issue STOP only for last message or I2C_M_STOP Thread-Index: AQHUVBXNV4b8MDE1wEeOVqrfbBzmhw== Date: Mon, 24 Sep 2018 14:49:31 +0000 Message-ID: <20180924144919.164617-13-alexander.levin@microsoft.com> References: <20180924144919.164617-1-alexander.levin@microsoft.com> In-Reply-To: <20180924144919.164617-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;CY4PR21MB0181;6:pu9f71nQVrCd8m46IbhELCYaOo/2kOngxZuO+oW5EItuxhKsEgQSPEr0Be6jWSRCKMHpQrggbkFrUdv4qUbLeF0ZcJSgYy2Y1dwXDKRD6Xpxnu9OyvEUPxY7TFvh/y7qwI77nELPmnZtGNIkTra0uckwBhk2QB6NlQIXLjdFod0BIy4DVt2P8Ssn+p3kEqk0pT7+AhRpnaFsai1lhjOuQN/lfvX3s6huMCLqFnBlsK7B7n2zyyNccAtTvrx/cQalJh5abrxP5j7jbT9JcFddWYVgUP07q2baTEP5SAoYYT1nCd52OC7CGBbCm+2pN5LX7Ez5cWql8qB0yGRNPXlcTsb47vdgFj1eaVOxq6Sl9ZAH2NvX9IDRhs4C3+aH/Zp9xYOafZBQwNiZKkE+I8u24H1DKP0p++jSWkgOowP/eilS59KPLtztgbbHCdJpO/QdLMYac6TaSEfypkXQo/1x/w==;5:J5QzRwuPP5uSO1GG7UvCLbxFlYRRFRgs+IWlyEtXL0n7BMiiT+wMDBz6UMQ59YFCKl5uVPGTeaTEVIh4cjeyLehWdzGUQT0ZxM24B6OUEf51LnXaLjRxKUju6SqUfLZYFQNT0JifuX/gILSGFAJpYi2Ig8jUEmPyQB1jOVn8uhc=;7:tDdMFyJUChkwi8ITpUWwnm/5rJSzlGlRX4lcFp9Ys35x0JQ/1Ed18OF58hOSIWDv8S7rWYdqJhZWuo8UvCCAb6/0krBde6O/j4a9mUVRdKDBxBuPexCZ6yXeBiAGUGs6NVeEZYwpyJZVAaz+KNKLJighwlheho+VRSSrjtNzaSxX4ZH47RLqrXWXdOZWK8zLddE5lKg4nXbI9TEqjklw2c58savHKzgk6ij5NMU9QzBFM5cAgNKZUOg8Syn+XhZQ x-ms-office365-filtering-correlation-id: a734eab0-7706-4062-d0b6-08d6222d24ce x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989299)(5600074)(711020)(4618075)(4534165)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020);SRVR:CY4PR21MB0181; x-ms-traffictypediagnostic: CY4PR21MB0181: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171); x-ms-exchange-senderadcheck: 1 x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(6040522)(2401047)(5005006)(8121501046)(3231355)(944501410)(52105095)(2018427008)(10201501046)(93006095)(93001095)(3002001)(6055026)(149066)(150027)(6041310)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123564045)(20161123558120)(20161123560045)(20161123562045)(201708071742011)(7699051)(76991041);SRVR:CY4PR21MB0181;BCL:0;PCL:0;RULEID:;SRVR:CY4PR21MB0181; x-forefront-prvs: 0805EC9467 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(979002)(366004)(376002)(39860400002)(136003)(346002)(396003)(189003)(199004)(10290500003)(6116002)(26005)(102836004)(3846002)(5660300001)(22452003)(110136005)(10090500001)(8676002)(15650500001)(1076002)(54906003)(105586002)(186003)(316002)(106356001)(2501003)(6436002)(97736004)(6486002)(107886003)(7736002)(36756003)(478600001)(72206003)(14454004)(71200400001)(71190400001)(305945005)(256004)(5250100002)(217873002)(6666003)(2616005)(68736007)(53936002)(81166006)(81156014)(2900100001)(476003)(86612001)(4326008)(8936002)(486006)(99286004)(6512007)(86362001)(2906002)(25786009)(66066001)(6506007)(11346002)(446003)(76176011)(969003)(989001)(999001)(1009001)(1019001);DIR:OUT;SFP:1102;SCL:1;SRVR:CY4PR21MB0181;H:CY4PR21MB0776.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: Kq+kiPKLjU2/Suc1ALZQdmlcKCxMje6A3lC8DPK8+5BqW7refRXaBTg8d7UoIAYDkO00UebD0QG35mD4MNspRMIL7+twggA2OyMcpRIkcgal695QufBr6+6mG4lRMEqRlzesfkkZIWUXu8WIgU6mxIG1LlGzpxBvhT/fUTju1O+kkl1ABXu7CDdcDjBq2i8aU2vc+tBVrPJbSDLMdbHu96/GEemsE+TkKH4Zb7qQHMGDZYCgRTAu7kGOfJf1fvcu1lhOexyAS4ng3L1eR3PPe01wtZy5wCqs/iYP4H3S7urDFDlS+MPDEqmjZ8tvMXK9MqPNLUchJMtkTF9eJF8B5PhiYoYKCr6y/rXoq3qmc3A= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: a734eab0-7706-4062-d0b6-08d6222d24ce X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Sep 2018 14:49:31.1173 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0181 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masahiro Yamada [ Upstream commit 38f5d8d8cbb2ffa2b54315118185332329ec891c ] This driver currently emits a STOP if the next message is not I2C_MD_RD. It should not do it because it disturbs the I2C_RDWR ioctl, where read/write transactions are combined without STOP between. Issue STOP only when the message is the last one _or_ flagged with I2C_M_STOP. Fixes: dd6fd4a32793 ("i2c: uniphier: add UniPhier FIFO-less I2C driver") Signed-off-by: Masahiro Yamada Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/busses/i2c-uniphier.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/drivers/i2c/busses/i2c-uniphier.c b/drivers/i2c/busses/i2c-uni= phier.c index 56e92af46ddc..fdfcee9230e4 100644 --- a/drivers/i2c/busses/i2c-uniphier.c +++ b/drivers/i2c/busses/i2c-uniphier.c @@ -247,11 +247,8 @@ static int uniphier_i2c_master_xfer(struct i2c_adapter= *adap, return ret; =20 for (msg =3D msgs; msg < emsg; msg++) { - /* If next message is read, skip the stop condition */ - bool stop =3D !(msg + 1 < emsg && msg[1].flags & I2C_M_RD); - /* but, force it if I2C_M_STOP is set */ - if (msg->flags & I2C_M_STOP) - stop =3D true; + /* Emit STOP if it is the last message or I2C_M_STOP is set. */ + bool stop =3D (msg + 1 =3D=3D emsg) || (msg->flags & I2C_M_STOP); =20 ret =3D uniphier_i2c_master_xfer_one(adap, msg, stop); if (ret) --=20 2.17.1