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Thu, 23 Jan 2020 09:03:00 +0000 Received: from MN2PR18MB3408.namprd18.prod.outlook.com ([fe80::b96d:5663:6402:82ea]) by MN2PR18MB3408.namprd18.prod.outlook.com ([fe80::b96d:5663:6402:82ea%7]) with mapi id 15.20.2644.028; Thu, 23 Jan 2020 09:03:00 +0000 Received: from rric.localdomain (31.208.96.227) by HE1PR0902CA0010.eurprd09.prod.outlook.com (2603:10a6:3:e5::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2644.20 via Frontend Transport; Thu, 23 Jan 2020 09:02:59 +0000 From: Robert Richter To: Borislav Petkov , Mauro Carvalho Chehab , Tony Luck CC: James Morse , Aristeu Rozanski , Robert Richter , "linux-edac@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: [PATCH v3 06/10] EDAC/mc: Report "unknown memory" on too many DIMM labels found Thread-Topic: [PATCH v3 06/10] EDAC/mc: Report "unknown memory" on too many DIMM labels found Thread-Index: AQHV0cvpAjtm7u086USRplIay6mVRg== Date: Thu, 23 Jan 2020 09:03:00 +0000 Message-ID: <20200123090210.26933-7-rrichter@marvell.com> References: <20200123090210.26933-1-rrichter@marvell.com> In-Reply-To: <20200123090210.26933-1-rrichter@marvell.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: HE1PR0902CA0010.eurprd09.prod.outlook.com (2603:10a6:3:e5::20) To MN2PR18MB3408.namprd18.prod.outlook.com (2603:10b6:208:165::10) x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.20.1 x-originating-ip: [31.208.96.227] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 4f9ec508-3c2e-4ee6-8a68-08d79fe30c16 x-ms-traffictypediagnostic: MN2PR18MB3247: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8273; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 4f9ec508-3c2e-4ee6-8a68-08d79fe30c16 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Jan 2020 09:03:00.7349 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 70e1fb47-1155-421d-87fc-2e58f638b6e0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Ti1k0aLIIYHo/cqFdc+/v66u+E+ub3v/VymrSrrWTDcgCcoAsp89Q2V+RDU4x4lyviLrdaKsMMlSODvGOasK4w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR18MB3247 X-OriginatorOrg: marvell.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-22_08:2020-01-22,2020-01-22 signatures=0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is a limitation to report only EDAC_MAX_LABELS in e->label of the error descriptor. This is to prevent a possible string overflow. Current implementation falls back to "any memory" in this case and also stops all further processing to find a unique row and channel of the possible error location. Reporting "any memory" is wrong as the memory controller reported an error location for one of the layers. Instead, report "unknown memory" and also do not break early in the loop to further check row and channel for uniqueness. Signed-off-by: Robert Richter Acked-by: Aristeu Rozanski --- drivers/edac/edac_mc.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c index e75cb7a9c454..aa94152777fe 100644 --- a/drivers/edac/edac_mc.c +++ b/drivers/edac/edac_mc.c @@ -1245,20 +1245,21 @@ void edac_mc_handle_error(const enum hw_event_mc_er= r_type type, * channel/memory controller/... may be affected. * Also, don't show errors for empty DIMM slots. */ - if (!e->enable_per_layer_report || !dimm->nr_pages) + if (!dimm->nr_pages) continue; =20 - if (n_labels >=3D EDAC_MAX_LABELS) { - e->enable_per_layer_report =3D false; - break; - } n_labels++; - if (p !=3D e->label) { - strcpy(p, OTHER_LABEL); - p +=3D strlen(OTHER_LABEL); + if (n_labels > EDAC_MAX_LABELS) { + p =3D e->label; + *p =3D '\0'; + } else { + if (p !=3D e->label) { + strcpy(p, OTHER_LABEL); + p +=3D strlen(OTHER_LABEL); + } + strcpy(p, dimm->label); + p +=3D strlen(p); } - strcpy(p, dimm->label); - p +=3D strlen(p); =20 /* * get csrow/channel of the DIMM, in order to allow --=20 2.20.1