From patchwork Mon Oct 17 09:20:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 616001 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B3852C433FE for ; Mon, 17 Oct 2022 08:50:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230089AbiJQIuk (ORCPT ); Mon, 17 Oct 2022 04:50:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230076AbiJQIu3 (ORCPT ); Mon, 17 Oct 2022 04:50:29 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BC44333379; Mon, 17 Oct 2022 01:50:27 -0700 (PDT) Received: from fraeml738-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4MrVyh5GKTz6H7L6; Mon, 17 Oct 2022 16:48:44 +0800 (CST) Received: from lhrpeml500003.china.huawei.com (7.191.162.67) by fraeml738-chm.china.huawei.com (10.206.15.219) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 17 Oct 2022 10:50:25 +0200 Received: from localhost.localdomain (10.69.192.58) by lhrpeml500003.china.huawei.com (7.191.162.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 17 Oct 2022 09:50:23 +0100 From: John Garry To: , , , CC: , , , , , "John Garry" Subject: [PATCH v6 5/8] scsi: pm8001: Modify task abort handling for SATA task Date: Mon, 17 Oct 2022 17:20:32 +0800 Message-ID: <1665998435-199946-6-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1665998435-199946-1-git-send-email-john.garry@huawei.com> References: <1665998435-199946-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.69.192.58] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To lhrpeml500003.china.huawei.com (7.191.162.67) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org When we try to abort a SATA task, the CCB of the task which we are trying to avoid may still complete. In this case, we should not touch the task associated with that CCB as we can race with libsas freeing the last later in sas_eh_handle_sas_errors() -> sas_eh_finish_cmd() for when TASK_IS_ABORTED is returned from sas_scsi_find_task() Signed-off-by: John Garry Acked-by: Jack Wang Tested-by: Damien Le Moal Tested-by: Niklas Cassel # pm80xx --- drivers/scsi/pm8001/pm8001_hwi.c | 15 +++++++++++++-- drivers/scsi/pm8001/pm8001_sas.c | 8 ++++++++ drivers/scsi/pm8001/pm80xx_hwi.c | 14 ++++++++++---- 3 files changed, 31 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c index 628b08ba6770..c0adc3a9d196 100644 --- a/drivers/scsi/pm8001/pm8001_hwi.c +++ b/drivers/scsi/pm8001/pm8001_hwi.c @@ -2295,7 +2295,9 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) if (t->dev && (t->dev->lldd_dev)) pm8001_dev = t->dev->lldd_dev; } else { - pm8001_dbg(pm8001_ha, FAIL, "task null\n"); + pm8001_dbg(pm8001_ha, FAIL, "task null, freeing CCB tag %d\n", + ccb->ccb_tag); + pm8001_ccb_free(pm8001_ha, ccb); return; } @@ -2675,8 +2677,17 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha, void *piomb) pm8001_dev = ccb->device; if (event) pm8001_dbg(pm8001_ha, FAIL, "sata IO status 0x%x\n", event); - if (unlikely(!t || !t->lldd_task || !t->dev)) + + if (unlikely(!t)) { + pm8001_dbg(pm8001_ha, FAIL, "task null, freeing CCB tag %d\n", + ccb->ccb_tag); + pm8001_ccb_free(pm8001_ha, ccb); return; + } + + if (unlikely(!t->lldd_task || !t->dev)) + return; + ts = &t->task_status; pm8001_dbg(pm8001_ha, DEVIO, "port_id:0x%x, device_id:0x%x, tag:0x%x, event:0x%x\n", diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c index 8e3f2f9ddaac..d5ec29f69be3 100644 --- a/drivers/scsi/pm8001/pm8001_sas.c +++ b/drivers/scsi/pm8001/pm8001_sas.c @@ -983,6 +983,7 @@ int pm8001_query_task(struct sas_task *task) /* mandatory SAM-3, still need free task/ccb info, abort the specified task */ int pm8001_abort_task(struct sas_task *task) { + struct pm8001_ccb_info *ccb = task->lldd_task; unsigned long flags; u32 tag; struct domain_device *dev ; @@ -1113,6 +1114,13 @@ int pm8001_abort_task(struct sas_task *task) pm8001_dev, DS_OPERATIONAL); wait_for_completion(&completion); } else { + /* + * Ensure that if we see a completion for the ccb + * associated with the task which we are trying to + * abort then we should not touch the sas_task as it + * may race with libsas freeing it when return here. + */ + ccb->task = NULL; ret = sas_execute_internal_abort_single(dev, tag, 0, NULL); } rc = TMF_RESP_FUNC_COMPLETE; diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c index f8b8624458f7..dd0e06983cd3 100644 --- a/drivers/scsi/pm8001/pm80xx_hwi.c +++ b/drivers/scsi/pm8001/pm80xx_hwi.c @@ -2396,7 +2396,9 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, if (t->dev && (t->dev->lldd_dev)) pm8001_dev = t->dev->lldd_dev; } else { - pm8001_dbg(pm8001_ha, FAIL, "task null\n"); + pm8001_dbg(pm8001_ha, FAIL, "task null, freeing CCB tag %d\n", + ccb->ccb_tag); + pm8001_ccb_free(pm8001_ha, ccb); return; } @@ -2813,12 +2815,16 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha, ccb = &pm8001_ha->ccb_info[tag]; t = ccb->task; pm8001_dev = ccb->device; - - if (unlikely(!t || !t->lldd_task || !t->dev)) { - pm8001_dbg(pm8001_ha, FAIL, "task or dev null\n"); + if (unlikely(!t)) { + pm8001_dbg(pm8001_ha, FAIL, "task null, freeing CCB tag %d\n", + ccb->ccb_tag); + pm8001_ccb_free(pm8001_ha, ccb); return; } + if (unlikely(!t->lldd_task || !t->dev)) + return; + ts = &t->task_status; pm8001_dbg(pm8001_ha, IOERR, "port_id:0x%x, tag:0x%x, event:0x%x\n", port_id, tag, event);