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=-16.7 required=3.0 tests=BAYES_00, 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 2B949C43460 for ; Fri, 21 May 2021 09:55:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0925E6135C for ; Fri, 21 May 2021 09:55:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237862AbhEUJ5M (ORCPT ); Fri, 21 May 2021 05:57:12 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:5651 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235661AbhEUJzU (ORCPT ); Fri, 21 May 2021 05:55:20 -0400 Received: from dggems701-chm.china.huawei.com (unknown [172.30.72.60]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4Fmhgw2GzXz16QWx; Fri, 21 May 2021 17:51:08 +0800 (CST) Received: from dggema753-chm.china.huawei.com (10.1.198.195) by dggems701-chm.china.huawei.com (10.3.19.178) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2176.2; Fri, 21 May 2021 17:53:55 +0800 Received: from localhost.localdomain (10.69.192.56) by dggema753-chm.china.huawei.com (10.1.198.195) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Fri, 21 May 2021 17:53:55 +0800 From: Weihang Li To: , CC: , , , Weihang Li , Faisal Latif , Shiraz Saleem Subject: [PATCH v2 for-next 13/17] RDMA/i40iw: Use refcount_t instead of atomic_t on refcount of i40iw_cm_listener Date: Fri, 21 May 2021 17:53:41 +0800 Message-ID: <1621590825-60693-14-git-send-email-liweihang@huawei.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1621590825-60693-1-git-send-email-liweihang@huawei.com> References: <1621590825-60693-1-git-send-email-liweihang@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.69.192.56] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggema753-chm.china.huawei.com (10.1.198.195) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org The refcount_t API will WARN on underflow and overflow of a reference counter, and avoid use-after-free risks. Cc: Faisal Latif Cc: Shiraz Saleem Signed-off-by: Weihang Li --- drivers/infiniband/hw/i40iw/i40iw_cm.c | 10 +++++----- drivers/infiniband/hw/i40iw/i40iw_cm.h | 2 +- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/infiniband/hw/i40iw/i40iw_cm.c b/drivers/infiniband/hw/i40iw/i40iw_cm.c index 2450b7d..c1becb9 100644 --- a/drivers/infiniband/hw/i40iw/i40iw_cm.c +++ b/drivers/infiniband/hw/i40iw/i40iw_cm.c @@ -1491,7 +1491,7 @@ static struct i40iw_cm_listener *i40iw_find_listener( !memcmp(listen_addr, ip_zero, sizeof(listen_addr))) && (listen_port == dst_port) && (listener_state & listen_node->listener_state)) { - atomic_inc(&listen_node->ref_count); + refcount_inc(&listen_node->ref_count); spin_unlock_irqrestore(&cm_core->listen_list_lock, flags); return listen_node; } @@ -1910,7 +1910,7 @@ static int i40iw_dec_refcnt_listen(struct i40iw_cm_core *cm_core, } } - if (!atomic_dec_return(&listener->ref_count)) { + if (refcount_dec_and_test(&listener->ref_count)) { spin_lock_irqsave(&cm_core->listen_list_lock, flags); list_del(&listener->list); spin_unlock_irqrestore(&cm_core->listen_list_lock, flags); @@ -2870,7 +2870,7 @@ static struct i40iw_cm_listener *i40iw_make_listen_node( I40IW_CM_LISTENER_EITHER_STATE); if (listener && (listener->listener_state == I40IW_CM_LISTENER_ACTIVE_STATE)) { - atomic_dec(&listener->ref_count); + refcount_dec(&listener->ref_count); i40iw_debug(cm_core->dev, I40IW_DEBUG_CM, "Not creating listener since it already exists\n"); @@ -2888,7 +2888,7 @@ static struct i40iw_cm_listener *i40iw_make_listen_node( INIT_LIST_HEAD(&listener->child_listen_list); - atomic_set(&listener->ref_count, 1); + refcount_set(&listener->ref_count, 1); } else { listener->reused_node = 1; } @@ -3213,7 +3213,7 @@ void i40iw_receive_ilq(struct i40iw_sc_vsi *vsi, struct i40iw_puda_buf *rbuf) I40IW_DEBUG_CM, "%s allocate node failed\n", __func__); - atomic_dec(&listener->ref_count); + refcount_dec(&listener->ref_count); return; } if (!tcph->rst && !tcph->fin) { diff --git a/drivers/infiniband/hw/i40iw/i40iw_cm.h b/drivers/infiniband/hw/i40iw/i40iw_cm.h index 6e43e4d..839966a 100644 --- a/drivers/infiniband/hw/i40iw/i40iw_cm.h +++ b/drivers/infiniband/hw/i40iw/i40iw_cm.h @@ -291,7 +291,7 @@ struct i40iw_cm_listener { u32 loc_addr[4]; u16 loc_port; struct iw_cm_id *cm_id; - atomic_t ref_count; + refcount_t ref_count; struct i40iw_device *iwdev; atomic_t pend_accepts_cnt; int backlog; -- 2.7.4