From patchwork Thu Apr 15 20:35:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Bogdanov X-Patchwork-Id: 12206021 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 4F028C433B4 for ; Thu, 15 Apr 2021 20:36:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2877061132 for ; Thu, 15 Apr 2021 20:36:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235215AbhDOUgd (ORCPT ); Thu, 15 Apr 2021 16:36:33 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:39278 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S234894AbhDOUgd (ORCPT ); Thu, 15 Apr 2021 16:36:33 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 61FDF4138D; Thu, 15 Apr 2021 20:36:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :x-mailer:message-id:date:date:subject:subject:from:from :received:received:received; s=mta-01; t=1618518967; x= 1620333368; bh=c1eg21lqubOreR37W0K3pDIX2iHmsCML0kLSAeRAJpQ=; b=q mXEauFRc7D/nEpf/V8uVuvE7xd/w2We9Zci81xd/J7dqNs3fgQJ+qRR6dFofwFJ4 NSoHW/6+TlqNLsUbljqCgoHvpzuZIWi4UR/FmjCAOxC8j6BYdKLB/fMZki+kraHt SBPGjvZGusCLizYQ/Kj9W3NKtVaWml508bm3BvFzik= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IkCbtrtiviRI; Thu, 15 Apr 2021 23:36:07 +0300 (MSK) Received: from T-EXCH-03.corp.yadro.com (t-exch-03.corp.yadro.com [172.17.100.103]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id BA28A41377; Thu, 15 Apr 2021 23:36:06 +0300 (MSK) Received: from NB-591.corp.yadro.com (10.199.0.31) by T-EXCH-03.corp.yadro.com (172.17.100.103) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Thu, 15 Apr 2021 23:36:06 +0300 From: Dmitry Bogdanov To: Martin Petersen , Nilesh Javali , CC: , , , Dmitry Bogdanov , Roman Bolshakov Subject: [PATCH] scsi: qla2xx: wait for stop_phase1 at wwn removal Date: Thu, 15 Apr 2021 23:35:54 +0300 Message-ID: <20210415203554.27890-1-d.bogdanov@yadro.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.199.0.31] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-03.corp.yadro.com (172.17.100.103) Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org Target de-configuration panics at high CPU load. TPGT and WWPN can be removed on separate threads. TPGT removal requests a reset HBA on a separate thread and waits for reset complete (qlt_stop_phase1). Due to high CPU load that HBA reset can be delayed for some time. WWPN removal does qlt_stop_phase2 where it is thinked that phase1 has been already finished and zeroed tgt.tgt_ops that is used by incoming traffic and causes several panics: NIP qlt_reset+0x7c/0x220 [qla2xxx] LR qlt_reset+0x68/0x220 [qla2xxx] Call Trace: 0xc000003ffff63a78 (unreliable) qlt_handle_imm_notify+0x800/0x10c0 [qla2xxx] qlt_24xx_atio_pkt+0x208/0x590 [qla2xxx] qlt_24xx_process_atio_queue+0x33c/0x7a0 [qla2xxx] qla83xx_msix_atio_q+0x54/0x90 [qla2xxx] or NIP qlt_24xx_handle_abts+0xd0/0x2a0 [qla2xxx] LR qlt_24xx_handle_abts+0xb4/0x2a0 [qla2xxx] Call Trace: qlt_24xx_handle_abts+0x90/0x2a0 [qla2xxx] (unreliable) qlt_24xx_process_atio_queue+0x500/0x7a0 [qla2xxx] qla83xx_msix_atio_q+0x54/0x90 [qla2xxx] or NIP qlt_create_sess+0x90/0x4e0 [qla2xxx] LR qla24xx_do_nack_work+0xa8/0x180 [qla2xxx] Call Trace: 0xc0000000348fba30 (unreliable) qla24xx_do_nack_work+0xa8/0x180 [qla2xxx] qla2x00_do_work+0x674/0xbf0 [qla2xxx] qla2x00_iocb_work_fn The patch fixes the issue by serializing qlt_stop_phase1 and qlt_stop_phase2 functions to make WWPN removal waits for phase1 completion. Reviewed-by: Roman Bolshakov Signed-off-by: Dmitry Bogdanov --- Patch is for scsi-fixes tree. The issue is very old, but the patch is applicable for 4.20+ versions. drivers/scsi/qla2xxx/qla_target.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c index 480e7d2dcf3e..745d6d98c02e 100644 --- a/drivers/scsi/qla2xxx/qla_target.c +++ b/drivers/scsi/qla2xxx/qla_target.c @@ -1558,10 +1558,12 @@ void qlt_stop_phase2(struct qla_tgt *tgt) return; } + mutex_lock(&tgt->ha->optrom_mutex); mutex_lock(&vha->vha_tgt.tgt_mutex); tgt->tgt_stop = 0; tgt->tgt_stopped = 1; mutex_unlock(&vha->vha_tgt.tgt_mutex); + mutex_unlock(&tgt->ha->optrom_mutex); ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00c, "Stop of tgt %p finished\n", tgt);