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Mon, 24 Sep 2018 14:49:00 +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 14:49:00 +0000 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Masahiro Yamada , Wolfram Sang , Sasha Levin Subject: [PATCH AUTOSEL 4.18 53/76] i2c: uniphier: issue STOP only for last message or I2C_M_STOP Thread-Topic: [PATCH AUTOSEL 4.18 53/76] i2c: uniphier: issue STOP only for last message or I2C_M_STOP Thread-Index: AQHUVBWrXrThOmfoIEuLv2oEOyM3xw== Date: Mon, 24 Sep 2018 14:48:34 +0000 Message-ID: <20180924144751.164410-52-alexander.levin@microsoft.com> References: <20180924144751.164410-1-alexander.levin@microsoft.com> In-Reply-To: <20180924144751.164410-1-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;CY4PR21MB0744;6:BC1PoxrtxGcXikZiXSN8l7n9qfq0qa8PQdSu839L6mV4/4mKInd1I05QhWy8vDH+GAUUXlutYpicjQxhaVNYeKneFT2hLGqFSKW1vUVbW/kJU1svC69UuUI/N5KD5sO9jhSrJDNFe0lK2towJM/K/mrMHIwzDiOtSrSSdziDhzcjr7kiYO6P5xR5Zu6UhDcKNunQdo/+Xpa88VYHB0RxGnWs5idPHEYZlu5lq5EczbvvYWmTRyFR+hC1P/Qmf8CGFwUjtOf8wqWhYMp09iAooBpm+fZDJoOVuzsl26QWnWXxi3HTtujLPhkm9naf/B5e1Xcvq08xZxFG/DIT0UTaF0cQHZsgPUKaGSYGvyedfj87lhvb28gQKiPuLjwN+zr2d6M/Wm63mZxBFkMafbNuidV3PZPSTwvvWsNjnt/G5DCrhovMOqApE4XqpsBPEOFiIDc1JENNwnAdBpG6HpYtHQ==;5:x+2TssD5yVz797XeN1ppVf1WEaX09TMcaVhoAyobee5paoXiNf8/DlMdGpBrmpsTci+7Vp1Q8htGJ+tDV/Zl8oAahi3TGi83VXt46wQhUkCq5/oIg7wpKHjMrqWcVjSqpzJHcOtjS8WkkDAPo3FdwH0T+Kq4DPOSdHBGWQ3UxXM=;7:5vGBRcE0TiftK+LvEPFVF8h31XOtc/o5QmgMYPPxjtuZc8MsHFgx/QAmlvGeNz1QtxALz20rEop44HFYqbSmZLmqJwvBSwmTdq8U5LDbxgYzZ4rjPigf0j2FeDF+/RFXQ+zxLkj/ZC48T0c3hLL5N7wkEVHjAHB3FGiQtYVe5j+0QaNXgOgLzrMkYhpiBSzKTP+Jx69kr/RngnHu1pdu/OhvtyE6Up78GKHwSmnEwWPgoeAgZBVftu6tkMUZmUHr x-ms-office365-filtering-correlation-id: 70ec33a4-edd6-4485-c07f-08d6222cdd1e x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989299)(4534165)(4627221)(201703031133081)(201702281549075)(8990200)(5600074)(711020)(4618075)(2017052603328)(7193020);SRVR:CY4PR21MB0744; 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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: gNsaYKT0wP2AysPhVELE5ai+lp9WbEkImakFa9Oiop45FwOT/GcugDL/nVWMoxlLmVCktqRfCW+SQuItK3G8xCCoNLrdAMiXhJm5xZiqFiDRhGioNZ0g5oBcKk87zqWGYZyoavbSfqFUVB7R7fxE0Cf28/HDXJG3AwCnw0tgvdo5nTmJfVIlzsMRbj0dXUouUTLJeSmAULnkt4qMxCIKpiBdOkGetKM/z8FoKTydhsiThR1H3vsy+D70SxSvNi8GtGCRhrbXTiZUEmtoMYeQ6+GU4NoCrfALTKLIrIvxce8GIFPdkf6uIDrr8DmqN3FeASvKPj1GzzJwBPxgCzURKoO1KPLZUxKzNTrcTg0Ae20= 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: 70ec33a4-edd6-4485-c07f-08d6222cdd1e X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Sep 2018 14:48:34.1033 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0744 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 bb181b088291..454f914ae66d 100644 --- a/drivers/i2c/busses/i2c-uniphier.c +++ b/drivers/i2c/busses/i2c-uniphier.c @@ -248,11 +248,8 @@ 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