From patchwork Wed Dec 4 11:36:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joakim Zhang X-Patchwork-Id: 1204125 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=nxp.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=nxp.com header.i=@nxp.com header.b="I+6TpkHd"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47ScHc0nwtz9sR8 for ; Wed, 4 Dec 2019 22:36:12 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727719AbfLDLgL (ORCPT ); Wed, 4 Dec 2019 06:36:11 -0500 Received: from mail-eopbgr140074.outbound.protection.outlook.com ([40.107.14.74]:18334 "EHLO EUR01-VE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727472AbfLDLgK (ORCPT ); Wed, 4 Dec 2019 06:36:10 -0500 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=HKJYgexbCob+0YIPg/Zw76CQpbfSjOqC+kPOGUMQjVLR7iZpkaxgKi1suRFkAF+sbuE7HRJT+GIyhePj/GilL44Zt5ipeFmkbzuL72vXfv8XzOje1HnKXPK9bMfFPlRVD+HK1yXAQLzDuiydKIxWqNIvRLPMsZwynprc9HMJGW0A9y/KsuKeMuYOkk6S+JIWFK9sN0t9hj5oe1vM0nHd4XTvPN7ZHxjvJ85B0d/p2EX2xnn9LrLqzQJh0CZjP9MCVVtZQxpIK9QN8cMCH19h4jkG+2F61lm0vL97Ogl8Xzak4I3Ce3dgVJYwI1VcNArJUDwP4+g7TxW31U1KVqxBWw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=CIDqyzvAHYJshpec/3W8eFMZH9gPnN9yHqy84Z8doQ0=; b=Hl3k0bXdirlM8HHMIEqQ+5w7utC45yeHQjgZrOj3agbHo4MA5z+dFkBFtEonI5l016o4VVXALJVO07efpP9KMPnEA+BaIFKndAYUIhcw3xB1prsVKbcX2ZX9ytzBiW6QAAaX9yJwP9jv79LNdaAIv2tNK3sqKNM1CUHWA4Z8eWWq/IRF6/hdA+E31f58G0iyUSUxDvfYTuJhcMYgyfRYaRqhBCabqPf/tN/tT9CGMqINLPMxlYIZKNoKuJGAqsDHV9diFNHHhO2uwregZ1Kl8LQxGwaUmbqSWrR3o3KoyDkc1w/dghwhXNEeeZrtIuIGeytfmzYB+ykQFITAA+b51Q== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nxp.com; dmarc=pass action=none header.from=nxp.com; dkim=pass header.d=nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=CIDqyzvAHYJshpec/3W8eFMZH9gPnN9yHqy84Z8doQ0=; b=I+6TpkHd0vLfuWTjCuqInz9hprU384oYJO1c5u9OaRStyns0Zpx5smm7vvPNq1w4NuTYwecqFE9EoiDMuAg62rdSRFc7BL1eqDjFRfJTiTV51uTrcvw7eso+WvWPMHg44RQjlRm6GCLtOkNfF7Yu6doetWQVfJhzsAJJxs67fBc= Received: from DB7PR04MB4618.eurprd04.prod.outlook.com (52.135.139.151) by DB7PR04MB5017.eurprd04.prod.outlook.com (20.176.234.213) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2516.13; Wed, 4 Dec 2019 11:36:06 +0000 Received: from DB7PR04MB4618.eurprd04.prod.outlook.com ([fe80::1c96:c591:7d51:64e6]) by DB7PR04MB4618.eurprd04.prod.outlook.com ([fe80::1c96:c591:7d51:64e6%4]) with mapi id 15.20.2516.003; Wed, 4 Dec 2019 11:36:06 +0000 From: Joakim Zhang To: "mkl@pengutronix.de" , "sean@geanix.com" , "linux-can@vger.kernel.org" CC: dl-linux-imx , "netdev@vger.kernel.org" , Joakim Zhang Subject: [PATCH V3 1/6] can: flexcan: fix deadlock when using self wakeup Thread-Topic: [PATCH V3 1/6] can: flexcan: fix deadlock when using self wakeup Thread-Index: AQHVqpcEJjZ5iRmVok+AlRWKu7CINQ== Date: Wed, 4 Dec 2019 11:36:06 +0000 Message-ID: <20191204113249.3381-2-qiangqing.zhang@nxp.com> References: <20191204113249.3381-1-qiangqing.zhang@nxp.com> In-Reply-To: <20191204113249.3381-1-qiangqing.zhang@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.17.1 x-clientproxiedby: SG2PR02CA0050.apcprd02.prod.outlook.com (2603:1096:4:54::14) To DB7PR04MB4618.eurprd04.prod.outlook.com (2603:10a6:5:38::23) authentication-results: spf=none (sender IP is ) smtp.mailfrom=qiangqing.zhang@nxp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [119.31.174.71] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: a653847b-0bde-439e-b28e-08d778ae2682 x-ms-traffictypediagnostic: DB7PR04MB5017:|DB7PR04MB5017: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; x-forefront-prvs: 0241D5F98C x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(4636009)(366004)(376002)(396003)(39860400002)(136003)(346002)(199004)(189003)(54534003)(3846002)(316002)(36756003)(6512007)(305945005)(2201001)(6486002)(6436002)(2906002)(7736002)(76176011)(52116002)(14444005)(71190400001)(71200400001)(110136005)(6116002)(478600001)(14454004)(81166006)(99286004)(6506007)(102836004)(26005)(25786009)(1076003)(186003)(2501003)(81156014)(2616005)(8936002)(11346002)(5660300002)(8676002)(50226002)(64756008)(4326008)(66446008)(66946007)(66556008)(66476007)(86362001)(54906003); DIR:OUT; SFP:1101; SCL:1; SRVR:DB7PR04MB5017; H:DB7PR04MB4618.eurprd04.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: a653847b-0bde-439e-b28e-08d778ae2682 X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Dec 2019 11:36:06.4105 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: j5s1LmEdsXneJtKuotEYMOJds5SA0OEitRTaoi9huLWo8H1i01ynlTc1D2e6hOCGtcXsSg3/9cXYZmOhcvI0YQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB7PR04MB5017 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Sean Nyekjaer When suspending, when there is still can traffic on the interfaces the flexcan immediately wakes the platform again. As it should :-). But it throws this error msg: [ 3169.378661] PM: noirq suspend of devices failed On the way down to suspend the interface that throws the error message does call flexcan_suspend but fails to call flexcan_noirq_suspend. That means flexcan_enter_stop_mode is called, but on the way out of suspend the driver only calls flexcan_resume and skips flexcan_noirq_resume, thus it doesn't call flexcan_exit_stop_mode. This leaves the flexcan in stop mode, and with the current driver it can't recover from this even with a soft reboot, it requires a hard reboot. This patch can fix deadlock when using self wakeup, it happenes to be able to fix another issue that frames out-of-order in first IRQ handler run after wakeup. In wakeup case, after system resume, frames received out-of-order in first IRQ handler, the problem is wakeup latency from frame reception to IRQ handler is much bigger than the counter overflow. This means it's impossible to sort the CAN frames by timestamp. The reason is that controller exits stop mode during noirq resume, then it can receive the frame immediately. If noirq reusme stage consumes much time, it will extend interrupt response time. So exit stop mode during resume stage instead of noirq resume can fix this issue. Fixes: de3578c198c6 ("can: flexcan: add self wakeup support") Signed-off-by: Sean Nyekjaer Tested-by: Sean Nyekjaer Signed-off-by: Joakim Zhang ------ ChangeLog: V1->V2: *no change. V2->V3: *split wakeup interrupt ack into another patch. --- drivers/net/can/flexcan.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 2efa06119f68..99aae90c1cdd 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -1722,6 +1722,9 @@ static int __maybe_unused flexcan_resume(struct device *device) netif_start_queue(dev); if (device_may_wakeup(device)) { disable_irq_wake(dev->irq); + err = flexcan_exit_stop_mode(priv); + if (err) + return err; } else { err = pm_runtime_force_resume(device); if (err) @@ -1767,14 +1770,9 @@ static int __maybe_unused flexcan_noirq_resume(struct device *device) { struct net_device *dev = dev_get_drvdata(device); struct flexcan_priv *priv = netdev_priv(dev); - int err; - if (netif_running(dev) && device_may_wakeup(device)) { + if (netif_running(dev) && device_may_wakeup(device)) flexcan_enable_wakeup_irq(priv, false); - err = flexcan_exit_stop_mode(priv); - if (err) - return err; - } return 0; }