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x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966366AbeCSROQ (ORCPT ); Mon, 19 Mar 2018 13:14:16 -0400 Received: from mail-bn3nam01on0110.outbound.protection.outlook.com ([104.47.33.110]:35072 "EHLO NAM01-BN3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S966569AbeCSQKJ (ORCPT ); Mon, 19 Mar 2018 12:10:09 -0400 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Vaibhav Jain , Alexandre Belloni , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 105/167] rtc: opal: Handle disabled TPO in opal_get_tpo_time() Thread-Topic: [PATCH AUTOSEL for 4.4 105/167] rtc: opal: Handle disabled TPO in opal_get_tpo_time() Thread-Index: AQHTv5xjV8oZH49DyUy3iY/C81aI5g== Date: Mon, 19 Mar 2018 16:07:33 +0000 Message-ID: <20180319160513.16384-105-alexander.levin@microsoft.com> References: <20180319160513.16384-1-alexander.levin@microsoft.com> In-Reply-To: <20180319160513.16384-1-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;DM5PR2101MB1095;7:lOI+2PNIV5Akutr6/A5R60oEajCLfQPxQgmDSHrieBRihI/cJALW0BcUISIdwjSbZvvSA5vvdh1wPiYhdo2r6giTC+7k5C7vjdZowzoiIDdniqZaqlxOaCM6/Xmp6PUVecS9QBsL1N8UZfOQtnqgWj8fzDXoiRtnrYvcQQE0zPaAVSz1AYCbZ01UGQ1VUbxedTigxWhbE/vtuCHuCYJ6Et+nlpAK70pgPM0tbAB1k/Q1ZVSg7zdmSNojL7Dz/7/V;20:Q/hXN/Y6oDdEIxrOaBVnf3OwcrnELMd0pMrNq+KSOp4Rduc00w0UCnkXhdPOlDSI6YeMlcH1gMrD7qYnsnXG8okJ8RoHT3WrnJFtam6X7DhseUsigqr8HX4RCuQlTTqnyyr5hY43L6z/0eeTtwuMzINl/FxEEB6hvsZ5BWH1+Ts= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: cf96968d-473f-4a37-f15e-08d58db3db1a x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1095; 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x-microsoft-antispam-message-info: ojzYMo1eprUFAKmbN8sTpWlWsArmJgzDsoRLpnBPXbBj+Ysmj12fQKLoQNu7g4t2II5WzygMDSMqz5o7lJMnCmGdI1fMOjVrhuS6OD/jHXIryVauVjWP3imjWju4W/JiNV7Tj/beImLDQpcbpT4ZiR2tBa5QfdMyisZBr8fjunvQZMs8p6Ja7z10b7Mo0uVnqKSa977jZxzITq+hyswyPCwyMO9ZMFISP3mG3HT9kTTdIX+ImhI07X5KVGdMnfr64B/OqVc9UNRE47XN5cM+Ue0koze6JWSkLIZWU6Z7QnyUgHGK4U8LXaLQ7O0XrP4TyPDyx/cPoSIEFMYlxWCxMw== 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: cf96968d-473f-4a37-f15e-08d58db3db1a X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 16:07:33.8906 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1095 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Vaibhav Jain [ Upstream commit 6dc1cf6f932bb0ea4d8f5e913a0a401ecacd2f03 ] On PowerNV platform when Timed-Power-On(TPO) is disabled, read of stored TPO yields value with all date components set to '0' inside opal_get_tpo_time(). The function opal_to_tm() then converts it to an offset from year 1900 yielding alarm-time =3D=3D "1900-00-01 00:00:00". This causes problems with __rtc_read_alarm() that expecting an offset from "1970-00-01 00:00:00" and returned alarm-time results in a -ve value for time64_t. Which ultimately results in this error reported in kernel logs with a seemingly garbage value: "rtc rtc0: invalid alarm value: -2-1--1041528741 2005511117:71582844:32" We fix this by explicitly handling the case of all alarm date-time components being '0' inside opal_get_tpo_time() and returning -ENOENT in such a case. This signals generic rtc that no alarm is set and it bails out from the alarm initialization flow without reporting the above error. Signed-off-by: Vaibhav Jain Reported-by: Steve Best Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin --- drivers/rtc/rtc-opal.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/rtc/rtc-opal.c b/drivers/rtc/rtc-opal.c index 229dd2fe8f45..c6b0c7ed7a30 100644 --- a/drivers/rtc/rtc-opal.c +++ b/drivers/rtc/rtc-opal.c @@ -150,6 +150,16 @@ static int opal_get_tpo_time(struct device *dev, struc= t rtc_wkalrm *alarm) =20 y_m_d =3D be32_to_cpu(__y_m_d); h_m_s_ms =3D ((u64)be32_to_cpu(__h_m) << 32); + + /* check if no alarm is set */ + if (y_m_d =3D=3D 0 && h_m_s_ms =3D=3D 0) { + pr_debug("No alarm is set\n"); + rc =3D -ENOENT; + goto exit; + } else { + pr_debug("Alarm set to %x %llx\n", y_m_d, h_m_s_ms); + } + opal_to_tm(y_m_d, h_m_s_ms, &alarm->time); =20 exit: --=20 2.14.1