From patchwork Fri Sep 10 01:02:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ding Hui X-Patchwork-Id: 12484191 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 A2379C433FE for ; Fri, 10 Sep 2021 01:12:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 81A0F610C9 for ; Fri, 10 Sep 2021 01:12:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236635AbhIJBNd (ORCPT ); Thu, 9 Sep 2021 21:13:33 -0400 Received: from mail-m17642.qiye.163.com ([59.111.176.42]:15866 "EHLO mail-m17642.qiye.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234705AbhIJBM7 (ORCPT ); Thu, 9 Sep 2021 21:12:59 -0400 Received: from localhost.localdomain (unknown [113.116.176.115]) by mail-m17642.qiye.163.com (Hmail) with ESMTPA id 3ABC52200C7; Fri, 10 Sep 2021 09:03:01 +0800 (CST) From: Ding Hui To: lduncan@suse.com, cleech@redhat.com, jejb@linux.ibm.com, martin.petersen@oracle.com, michael.christie@oracle.com, open-iscsi@googlegroups.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Ding Hui Subject: [PATCH 3/3] scsi: libiscsi: get ref to conn in iscsi_eh_device/target_reset() Date: Fri, 10 Sep 2021 09:02:20 +0800 Message-Id: <20210910010220.24073-4-dinghui@sangfor.com.cn> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210910010220.24073-1-dinghui@sangfor.com.cn> References: <20210910010220.24073-1-dinghui@sangfor.com.cn> X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgPGg8OCBgUHx5ZQUlOS1dZCBgUCR5ZQVlLVUtZV1 kWDxoPAgseWUFZKDYvK1lXWShZQUhPN1dZLVlBSVdZDwkaFQgSH1lBWRoaTEtWGR4eSEJOGU1DSx 8YVRMBExYaEhckFA4PWVdZFhoPEhUdFFlBWU9LSFVKSktITk9VS1kG X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6OS46Mio*Sj4KEh4BFy0tSEIZ IxIKFDJVSlVKTUhKSUhOTENKQ09PVTMWGhIXVR8SFRwTDhI7CBoVHB0UCVUYFBZVGBVFWVdZEgtZ QVlKSkhVSkpNVUpMTVVKSk5ZV1kIAVlBSE9CTTcG X-HM-Tid: 0a7bcd3ab389d998kuws3abc52200c7 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org like commit fda290c5ae98 ("scsi: iscsi: Get ref to conn during reset handling"), because in iscsi_exec_task_mgmt_fn(), the eh_mutex and frwd_lock will be unlock, the conn also can be released if we not hold ref. Signed-off-by: Ding Hui --- drivers/scsi/libiscsi.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 69b3b2148328..4d3b37c20f8a 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -2398,7 +2398,7 @@ int iscsi_eh_device_reset(struct scsi_cmnd *sc) { struct iscsi_cls_session *cls_session; struct iscsi_session *session; - struct iscsi_conn *conn; + struct iscsi_conn *conn = NULL; struct iscsi_tm *hdr; int rc = FAILED; @@ -2417,6 +2417,7 @@ int iscsi_eh_device_reset(struct scsi_cmnd *sc) if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) goto unlock; conn = session->leadconn; + iscsi_get_conn(conn->cls_conn); /* only have one tmf outstanding at a time */ if (session->tmf_state != TMF_INITIAL) @@ -2463,6 +2464,8 @@ int iscsi_eh_device_reset(struct scsi_cmnd *sc) done: ISCSI_DBG_EH(session, "dev reset result = %s\n", rc == SUCCESS ? "SUCCESS" : "FAILED"); + if (conn) + iscsi_put_conn(conn->cls_conn); mutex_unlock(&session->eh_mutex); return rc; } @@ -2560,7 +2563,7 @@ static int iscsi_eh_target_reset(struct scsi_cmnd *sc) { struct iscsi_cls_session *cls_session; struct iscsi_session *session; - struct iscsi_conn *conn; + struct iscsi_conn *conn = NULL; struct iscsi_tm *hdr; int rc = FAILED; @@ -2579,6 +2582,7 @@ static int iscsi_eh_target_reset(struct scsi_cmnd *sc) if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) goto unlock; conn = session->leadconn; + iscsi_get_conn(conn->cls_conn); /* only have one tmf outstanding at a time */ if (session->tmf_state != TMF_INITIAL) @@ -2625,6 +2629,8 @@ static int iscsi_eh_target_reset(struct scsi_cmnd *sc) done: ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, rc == SUCCESS ? "SUCCESS" : "FAILED"); + if (conn) + iscsi_put_conn(conn->cls_conn); mutex_unlock(&session->eh_mutex); return rc; }