From mboxrd@z Thu Jan 1 00:00:00 1970 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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 64F45C07E9B for ; Mon, 19 Jul 2021 15:08:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 51BCA61279 for ; Mon, 19 Jul 2021 15:08:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243210AbhGSO2J (ORCPT ); Mon, 19 Jul 2021 10:28:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:57020 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243092AbhGSOX1 (ORCPT ); Mon, 19 Jul 2021 10:23:27 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 59AAC611CE; Mon, 19 Jul 2021 15:03:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626706986; bh=frp5os3e6XNWtslDHOui4v0epU+AQnVOVRCsFNp/VSM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Yl70d4Vf1yRzuqCHUcWnqsmtnRFN2gOpQWmaKKTqSyuBAjnEt7QxpSCnXMyi5B+WC OA7++jeA5YH6sJ/jkpe1yReoAmiG1UI/wAxD+TFZZNa1ktBr7HyehxA0KqIpjhEd9b rINnyCtJO5uFSIDlZydMgEoOUqnFvCapKELueLWY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lee Duncan , Mike Christie , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.4 149/188] scsi: iscsi: Add iscsi_cls_conn refcount helpers Date: Mon, 19 Jul 2021 16:52:13 +0200 Message-Id: <20210719144941.366359911@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144913.076563739@linuxfoundation.org> References: <20210719144913.076563739@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mike Christie [ Upstream commit b1d19e8c92cfb0ded180ef3376c20e130414e067 ] There are a couple places where we could free the iscsi_cls_conn while it's still in use. This adds some helpers to get/put a refcount on the struct and converts an exiting user. Subsequent commits will then use the helpers to fix 2 bugs in the eh code. Link: https://lore.kernel.org/r/20210525181821.7617-11-michael.christie@oracle.com Reviewed-by: Lee Duncan Signed-off-by: Mike Christie Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/libiscsi.c | 7 ++----- drivers/scsi/scsi_transport_iscsi.c | 12 ++++++++++++ include/scsi/scsi_transport_iscsi.h | 2 ++ 3 files changed, 16 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 18b8d86ef74b..0713d02cf112 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -1384,7 +1384,6 @@ void iscsi_session_failure(struct iscsi_session *session, enum iscsi_err err) { struct iscsi_conn *conn; - struct device *dev; spin_lock_bh(&session->frwd_lock); conn = session->leadconn; @@ -1393,10 +1392,8 @@ void iscsi_session_failure(struct iscsi_session *session, return; } - dev = get_device(&conn->cls_conn->dev); + iscsi_get_conn(conn->cls_conn); spin_unlock_bh(&session->frwd_lock); - if (!dev) - return; /* * if the host is being removed bypass the connection * recovery initialization because we are going to kill @@ -1406,7 +1403,7 @@ void iscsi_session_failure(struct iscsi_session *session, iscsi_conn_error_event(conn->cls_conn, err); else iscsi_conn_failure(conn, err); - put_device(dev); + iscsi_put_conn(conn->cls_conn); } EXPORT_SYMBOL_GPL(iscsi_session_failure); diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index 42bc4b71b0ba..e0159e6a1065 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -2328,6 +2328,18 @@ int iscsi_destroy_conn(struct iscsi_cls_conn *conn) } EXPORT_SYMBOL_GPL(iscsi_destroy_conn); +void iscsi_put_conn(struct iscsi_cls_conn *conn) +{ + put_device(&conn->dev); +} +EXPORT_SYMBOL_GPL(iscsi_put_conn); + +void iscsi_get_conn(struct iscsi_cls_conn *conn) +{ + get_device(&conn->dev); +} +EXPORT_SYMBOL_GPL(iscsi_get_conn); + /* * iscsi interface functions */ diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h index 6183d20a01fb..e673c7c9c5fb 100644 --- a/include/scsi/scsi_transport_iscsi.h +++ b/include/scsi/scsi_transport_iscsi.h @@ -437,6 +437,8 @@ extern void iscsi_free_session(struct iscsi_cls_session *session); extern int iscsi_destroy_session(struct iscsi_cls_session *session); extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, int dd_size, uint32_t cid); +extern void iscsi_put_conn(struct iscsi_cls_conn *conn); +extern void iscsi_get_conn(struct iscsi_cls_conn *conn); extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); extern void iscsi_unblock_session(struct iscsi_cls_session *session); extern void iscsi_block_session(struct iscsi_cls_session *session); -- 2.30.2