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=-9.5 required=3.0 tests=DATE_IN_PAST_24_48, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 D0DE0C433DF for ; Fri, 3 Jul 2020 03:02:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B023A208FE for ; Fri, 3 Jul 2020 03:02:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726116AbgGCDCe (ORCPT ); Thu, 2 Jul 2020 23:02:34 -0400 Received: from mail5.windriver.com ([192.103.53.11]:52016 "EHLO mail5.wrs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725915AbgGCDCe (ORCPT ); Thu, 2 Jul 2020 23:02:34 -0400 Received: from ALA-HCA.corp.ad.wrs.com (ala-hca.corp.ad.wrs.com [147.11.189.40]) by mail5.wrs.com (8.15.2/8.15.2) with ESMTPS id 06330CNh013393 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Thu, 2 Jul 2020 20:00:45 -0700 Received: from pek-lpg-core1-vm1.wrs.com (128.224.156.106) by ALA-HCA.corp.ad.wrs.com (147.11.189.40) with Microsoft SMTP Server id 14.3.487.0; Thu, 2 Jul 2020 20:00:06 -0700 From: To: , , , CC: Subject: [PATCH] kthread: Don't cancel a work that is being cancelled Date: Thu, 2 Jul 2020 09:13:50 +0800 Message-ID: <20200702011350.32125-1-qiang.zhang@windriver.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zhang Qiang When canceling a work, if it is found that the work is in the cancelling state, we should directly exit the cancelled operation. Signed-off-by: Zhang Qiang --- kernel/kthread.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/kthread.c b/kernel/kthread.c index bfbfa481be3a..1166f2043e67 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -1103,6 +1103,9 @@ static bool __kthread_cancel_work_sync(struct kthread_work *work, bool is_dwork) /* Work must not be used with >1 worker, see kthread_queue_work(). */ WARN_ON_ONCE(work->worker != worker); + if (work->canceling) + goto out_fast; + ret = __kthread_cancel_work(work, is_dwork, &flags); if (worker->current_work != work) -- 2.24.1