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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,UNPARSEABLE_RELAY autolearn=no 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 6397EC2D0E2 for ; Tue, 22 Sep 2020 21:41:34 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6BCBD22262 for ; Tue, 22 Sep 2020 21:41:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="w34FK/fi" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6BCBD22262 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4Bwvrn3K7QzDqXS for ; Wed, 23 Sep 2020 07:41:29 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=oracle.com (client-ip=141.146.126.79; helo=aserp2130.oracle.com; envelope-from=martin.petersen@oracle.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=oracle.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=oracle.com header.i=@oracle.com header.a=rsa-sha256 header.s=corp-2020-01-29 header.b=w34FK/fi; dkim-atps=neutral Received: from aserp2130.oracle.com (aserp2130.oracle.com [141.146.126.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Bwvpn54wSzDqVZ for ; Wed, 23 Sep 2020 07:39:44 +1000 (AEST) Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08MLPSt4120802; Tue, 22 Sep 2020 21:39:39 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : message-id : references : date : in-reply-to : mime-version : content-type; s=corp-2020-01-29; bh=bKqjb3mPd/FBc/U8jba5rQrhQlBL5Tw/ZK1EsTH3wXk=; b=w34FK/fiMhH83aXlrNHCm/7IjPByMdEKIkmJs0ro6KLa9XHDSi76FX7s9sJeaBzum/OC 97rsoGplD5XSayYjAGwBVvtfxJS9xngjonOPUvDlBKSWdpM/+m6k3qvpgfRJCS//rti4 MJ194Ku+gNRVFrXkI09NWEHUWqPixwpk+H2zBHQp3r5g/0LX2fRxp8NlQYC47Hbq1DPU bpwumjoyqvOTG0luZerWSG1Gixvfo3Rfm2Jho5/H7IEG08mlbSf321mF6GSdTdpPCHvH 33gWMTpvj8duOf9NA/+QCLJ9XICdgFI7V0weOfFrn8t5npmP9za0HOJHSW2Tfy14+O0X Iw== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2130.oracle.com with ESMTP id 33qcptv7mp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 22 Sep 2020 21:39:39 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08MLPNhO019063; Tue, 22 Sep 2020 21:39:39 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3030.oracle.com with ESMTP id 33nux028vc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 22 Sep 2020 21:39:38 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 08MLdauB010911; Tue, 22 Sep 2020 21:39:37 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 22 Sep 2020 14:39:36 -0700 To: Brian King Subject: Re: [PATCH] ibmvfc: Protect vhost->task_set increment by the host lock From: "Martin K. Petersen" Organization: Oracle Corporation Message-ID: References: <1600286999-22059-1-git-send-email-brking@linux.vnet.ibm.com> Date: Tue, 22 Sep 2020 17:39:34 -0400 In-Reply-To: <1600286999-22059-1-git-send-email-brking@linux.vnet.ibm.com> (Brian King's message of "Wed, 16 Sep 2020 15:09:59 -0500") MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9752 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 phishscore=0 suspectscore=1 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009220167 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9752 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 mlxlogscore=999 adultscore=0 bulkscore=0 mlxscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 spamscore=0 malwarescore=0 clxscore=1015 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009220167 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tyreld@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, martin.petersen@oracle.com, linux-scsi@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Brian, > In the discovery thread, ibmvfc does a vhost->task_set++ without any > lock held. This could result in two targets getting the same cancel > key, which could have strange effects in error recovery. The actual > probability of this occurring should be extremely small, since this > should all be done in a single threaded loop from the discovery > thread, but let's fix it up anyway to be safe. Applied to 5.10/scsi-staging, thanks! -- Martin K. Petersen Oracle Linux Engineering