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=-12.0 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 B3E20C07E9E for ; Fri, 9 Jul 2021 06:43:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A5C06140F for ; Fri, 9 Jul 2021 06:43:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230508AbhGIGqQ (ORCPT ); Fri, 9 Jul 2021 02:46:16 -0400 Received: from mga05.intel.com ([192.55.52.43]:41600 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230178AbhGIGqO (ORCPT ); Fri, 9 Jul 2021 02:46:14 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10039"; a="295293985" X-IronPort-AV: E=Sophos;i="5.84,226,1620716400"; d="scan'208";a="295293985" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jul 2021 23:43:31 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,226,1620716400"; d="scan'208";a="648869584" Received: from ahunter-desktop.fi.intel.com ([10.237.72.79]) by fmsmga005.fm.intel.com with ESMTP; 08 Jul 2021 23:43:27 -0700 From: Adrian Hunter To: "Rafael J . Wysocki" Cc: Greg Kroah-Hartman , Saravana Kannan , "Martin K . Petersen" , "James E . J . Bottomley" , linux-scsi@vger.kernel.org, Avri Altman , Bean Huo , Can Guo , Asutosh Das , Bart Van Assche , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH V2 0/2] driver core: Add ability to delete device links of unregistered devices Date: Fri, 9 Jul 2021 09:43:39 +0300 Message-Id: <20210709064341.6206-1-adrian.hunter@intel.com> X-Mailer: git-send-email 2.17.1 Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi There is an issue with the SCSI UFS driver when the optional BOOT well-known LUN fails to probe, which is not a fatal error. The issue is that the device and its "managed" device link do not then get deleted. The device because the device link has a reference to it. The device link because it can only be deleted by device_del(), but device_add() was never called, so device_del() never will be either. These V2 patches fix the issue by amending device link removal to accept removal of a link with an unregistered consumer device, as suggested by Rafael. Changes in V2: Take approach suggested by Rafael Adrian Hunter (2): driver core: Add ability to delete device links of unregistered devices scsi: ufshcd: Fix device links when BOOT WLUN fails to probe drivers/base/core.c | 11 ++++++++--- drivers/scsi/ufs/ufshcd.c | 23 +++++++++++++++++++++-- 2 files changed, 29 insertions(+), 5 deletions(-) Regards Adrian