From patchwork Thu Jan 28 03:26:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Asutosh Das \(asd\)" X-Patchwork-Id: 373018 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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, 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 0C2E9C433E0 for ; Thu, 28 Jan 2021 03:27:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE0FD64DD3 for ; Thu, 28 Jan 2021 03:27:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231130AbhA1D1X (ORCPT ); Wed, 27 Jan 2021 22:27:23 -0500 Received: from labrats.qualcomm.com ([199.106.110.90]:4012 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229831AbhA1D1X (ORCPT ); Wed, 27 Jan 2021 22:27:23 -0500 IronPort-SDR: KDua15ydidQfEjOjrO8ttasyrVcsa0C4rykBFxQuHJe67T1OkTLEp5JuvVLJ4L24H+Uhu1cBl2 d1nrVodD0oTBVHb/74vrWbKMp4dwiiAxUSx1NSU+bHtPy+kdtFj0qsug47KP4Fg98H9YSG7o1I RvwHeFIgPs9T7cCaEqeRMxKbS8ZPVlPgdgdEBdZX2TIRuEOal+cB/8V3Pnr5VwY6LS8IpMvcq7 okfrH/EHCAvRIq7rNl1jEko37pM+v/gFU+0trxQgiwp82/1kJ7DqTpDYKNHQR54Y0XBBLZfRad 7v4= X-IronPort-AV: E=Sophos;i="5.79,381,1602572400"; d="scan'208";a="29571241" Received: from unknown (HELO ironmsg-SD-alpha.qualcomm.com) ([10.53.140.30]) by labrats.qualcomm.com with ESMTP; 27 Jan 2021 19:26:43 -0800 X-QCInternal: smtphost Received: from wsp769891wss.qualcomm.com (HELO stor-presley.qualcomm.com) ([192.168.140.85]) by ironmsg-SD-alpha.qualcomm.com with ESMTP; 27 Jan 2021 19:26:42 -0800 Received: by stor-presley.qualcomm.com (Postfix, from userid 92687) id 60182219A2; Wed, 27 Jan 2021 19:26:42 -0800 (PST) From: Asutosh Das To: cang@codeaurora.org, martin.petersen@oracle.com, linux-scsi@vger.kernel.org Cc: Asutosh Das , linux-arm-msm@vger.kernel.org, stern@rowland.harvard.edu Subject: [RFC PATCH v2 0/2] Fix deadlock in ufs Date: Wed, 27 Jan 2021 19:26:36 -0800 Message-ID: X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Message-ID: <20210128032636.ZwjIW61hSaED6NEPbzIWcBCb1YEeEtdJzq6vpw0bqQI@z> v1 -> v2 Use pm_runtime_get/put APIs. Assuming that all bsg devices are scsi devices may break. This patchset attempts to fix a deadlock in ufs. This deadlock occurs because the ufs host driver tries to resume its child (wlun scsi device) to send SSU to it during its suspend. Asutosh Das (2): block: bsg: resume scsi device before accessing scsi: ufs: Fix deadlock while suspending ufs host block/bsg.c | 8 ++++++++ drivers/scsi/ufs/ufshcd.c | 18 ++---------------- 2 files changed, 10 insertions(+), 16 deletions(-)