From patchwork Fri Dec 18 03:31:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jaegeuk Kim X-Patchwork-Id: 11981097 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=-17.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, 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 A50A9C4361B for ; Fri, 18 Dec 2020 03:32:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 75F3A23A57 for ; Fri, 18 Dec 2020 03:32:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731528AbgLRDcO (ORCPT ); Thu, 17 Dec 2020 22:32:14 -0500 Received: from mail.kernel.org ([198.145.29.99]:47126 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727234AbgLRDcO (ORCPT ); Thu, 17 Dec 2020 22:32:14 -0500 From: Jaegeuk Kim Authentication-Results: mail.kernel.org; dkim=permerror (bad message/signature format) To: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, kernel-team@android.com Cc: cang@codeaurora.org, alim.akhtar@samsung.com, avri.altman@wdc.com, bvanassche@acm.org, martin.petersen@oracle.com, stanley.chu@mediatek.com, Jaegeuk Kim Subject: [PATCH] scsi: ufs: fix livelock of ufshcd_clear_ua_wluns Date: Thu, 17 Dec 2020 19:31:31 -0800 Message-Id: <20201218033131.2624065-1-jaegeuk@kernel.org> X-Mailer: git-send-email 2.29.2.729.g45daf8777d-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org When gate_work/ungate_work gets an error during hibern8_enter or exit, ufshcd_err_handler() ufshcd_scsi_block_requests() ufshcd_reset_and_restore() ufshcd_clear_ua_wluns() -> stuck ufshcd_scsi_unblock_requests() In order to avoid it, ufshcd_clear_ua_wluns() can be called per recovery flows such as suspend/resume, link_recovery, and error_handler. Signed-off-by: Jaegeuk Kim Signed-off-by: Jaegeuk Kim --- drivers/scsi/ufs/ufshcd.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index e221add25a7e..e711def829cd 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -3963,6 +3963,8 @@ int ufshcd_link_recovery(struct ufs_hba *hba) if (ret) dev_err(hba->dev, "%s: link recovery failed, err %d", __func__, ret); + else + ufshcd_clear_ua_wluns(hba); return ret; } @@ -5968,6 +5970,8 @@ static void ufshcd_err_handler(struct work_struct *work) ufshcd_scsi_unblock_requests(hba); ufshcd_err_handling_unprepare(hba); up(&hba->eh_sem); + + ufshcd_clear_ua_wluns(hba); } /** @@ -6908,14 +6912,11 @@ static int ufshcd_host_reset_and_restore(struct ufs_hba *hba) ufshcd_set_clk_freq(hba, true); err = ufshcd_hba_enable(hba); - if (err) - goto out; /* Establish the link again and restore the device */ - err = ufshcd_probe_hba(hba, false); if (!err) - ufshcd_clear_ua_wluns(hba); -out: + err = ufshcd_probe_hba(hba, false); + if (err) dev_err(hba->dev, "%s: Host init failed %d\n", __func__, err); ufshcd_update_evt_hist(hba, UFS_EVT_HOST_RESET, (u32)err); @@ -8745,6 +8746,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) ufshcd_resume_clkscaling(hba); hba->clk_gating.is_suspended = false; hba->dev_info.b_rpm_dev_flush_capable = false; + ufshcd_clear_ua_wluns(hba); ufshcd_release(hba); out: if (hba->dev_info.b_rpm_dev_flush_capable) { @@ -8855,6 +8857,8 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) cancel_delayed_work(&hba->rpm_dev_flush_recheck_work); } + ufshcd_clear_ua_wluns(hba); + /* Schedule clock gating in case of no access to UFS device yet */ ufshcd_release(hba);