From patchwork Mon Jan 10 09:26:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Gu X-Patchwork-Id: 12708511 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 09C4AC43217 for ; Mon, 10 Jan 2022 09:27:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238282AbiAJJ1C (ORCPT ); Mon, 10 Jan 2022 04:27:02 -0500 Received: from out30-133.freemail.mail.aliyun.com ([115.124.30.133]:34021 "EHLO out30-133.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238188AbiAJJ1B (ORCPT ); Mon, 10 Jan 2022 04:27:01 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R211e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04357;MF=guwen@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0V1QvNC4_1641806784; Received: from e02h04404.eu6sqa(mailfrom:guwen@linux.alibaba.com fp:SMTPD_---0V1QvNC4_1641806784) by smtp.aliyun-inc.com(127.0.0.1); Mon, 10 Jan 2022 17:26:59 +0800 From: Wen Gu To: kgraul@linux.ibm.com, davem@davemloft.net, kuba@kernel.org Cc: linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net 0/3] net/smc: Fixes for race in smc link group termination Date: Mon, 10 Jan 2022 17:26:21 +0800 Message-Id: <1641806784-93141-1-git-send-email-guwen@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org We encountered some crashes recently and they are caused by the race between the access and free of link/link group in abnormal smc link group termination. The crashes can be reproduced in frequent abnormal link group termination, like setting RNICs up/down. This set of patches tries to fix this by extending the life cycle of link/link group to ensure that they won't be referred to after cleared or freed. Wen Gu (3): net/smc: Resolve the race between link group access and termination net/smc: Introduce a new conn->lgr validity check helper net/smc: Resolve the race between SMC-R link access and clear net/smc/af_smc.c | 6 +++- net/smc/smc.h | 1 + net/smc/smc_cdc.c | 3 +- net/smc/smc_clc.c | 2 +- net/smc/smc_core.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++-------- net/smc/smc_core.h | 12 +++++++ net/smc/smc_diag.c | 6 ++-- 7 files changed, 104 insertions(+), 20 deletions(-)