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=-4.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 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 9A327C433E0 for ; Wed, 23 Dec 2020 08:29:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6840A20C56 for ; Wed, 23 Dec 2020 08:29:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727734AbgLWI33 (ORCPT ); Wed, 23 Dec 2020 03:29:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36162 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727050AbgLWI33 (ORCPT ); Wed, 23 Dec 2020 03:29:29 -0500 Received: from mail-ej1-x634.google.com (mail-ej1-x634.google.com [IPv6:2a00:1450:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7FF57C0613D6; Wed, 23 Dec 2020 00:28:48 -0800 (PST) Received: by mail-ej1-x634.google.com with SMTP id j22so21694095eja.13; Wed, 23 Dec 2020 00:28:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=message-id:subject:from:to:cc:date:in-reply-to:references :mime-version:content-transfer-encoding; bh=vOvsdrMTBeh+0VgWngn+23DuawjliOPcgqQaj1GbRKY=; b=DIKBb/BUNSgro3YLF+P7soDLRNBMrBtdteYuQb14lgDvYCKS/ge1o6u1zEHW0BN9JI cghO6l/Run/1lyge+5qq+OuqwtQRoA+eh/wMZR8yddT8hvoqv9BCD8hwV+Of729kyZJF 8bXcpum4J2rE8SklE2KH8FFiN1PZFghxOUEP6IqQbKUkDmGJaWvXXcfKp9LyNwM2nnB2 y6xLMXFHg8gUh7VwdL/blGZMg+E9GXEgG4rBP+930WPW77iX4v4uYhHEIuL16MWPrs+r +PoS3z2eednzSkahv0bPZexLS1ehpTMNlf0XsVg+0TCV9SGBMWFzX3Ptm1mgMw/ZedZZ 6kQQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:subject:from:to:cc:date:in-reply-to :references:mime-version:content-transfer-encoding; bh=vOvsdrMTBeh+0VgWngn+23DuawjliOPcgqQaj1GbRKY=; b=h8Kv1jI2OXvuqMXwytEVvS2BGC+7wLR/JImWqYGT/f3kY2xVYkaHTQI9CXir4S/UsJ Ug5aa/dv/nN7F5F9t46dJWlMw8g6D/TfXrOu/dM+dJ5OQXTcyc5GRkM+EfFbuUOodLPP 9AO0A0aDHJMSUjKtbIL5PFYh5XMPt+CKkaYZ4oUXq69o9RHhdo8Ek7qMq+AzGJjhtDPf 6QAsvebQYoR41jMiokDhDfPeDi7Todfhsy6b3mFZNqMWIm3Xm/fuUXgR46eZ4eE5FvP5 h/svNG7KTNqUrQFlUgi/9EUdmDqUslJFuJdp7Ijyq8wt4hDJnhBOJRKOiLC4nx70HqId 2pbQ== X-Gm-Message-State: AOAM531PQPwbveY0v0gx2RZ6XgMQYwDZzck8njxqUqnJsFYk0gwzI43g bHyoKkwP8UEl8IzaMMGo7VM= X-Google-Smtp-Source: ABdhPJzba+QgayosWbyCokQxYLM3wIJswYeIWFvwSMMTL1kAlBUJ6ZoGALd4bXXBUkb1tnG1XW2CGQ== X-Received: by 2002:a17:907:d9e:: with SMTP id go30mr22395664ejc.488.1608712127247; Wed, 23 Dec 2020 00:28:47 -0800 (PST) Received: from ubuntu-laptop (ip5f5bfce9.dynamic.kabel-deutschland.de. [95.91.252.233]) by smtp.googlemail.com with ESMTPSA id ca4sm30369009edb.80.2020.12.23.00.28.46 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Wed, 23 Dec 2020 00:28:46 -0800 (PST) Message-ID: <9ac61bb53d1f33797107577f66aefe95e3e35bb9.camel@gmail.com> Subject: Re: [PATCH v5 1/7] scsi: ufs: Add "wb_on" sysfs node to control WB on/off From: Bean Huo To: Can Guo Cc: Stanley Chu , alim.akhtar@samsung.com, avri.altman@wdc.com, asutoshd@codeaurora.org, jejb@linux.ibm.com, martin.petersen@oracle.com, beanhuo@micron.com, bvanassche@acm.org, tomas.winkler@intel.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 23 Dec 2020 09:28:45 +0100 In-Reply-To: <862483add1462510b809aee6d3678435@codeaurora.org> References: <20201215230519.15158-1-huobean@gmail.com> <20201215230519.15158-2-huobean@gmail.com> <1608617307.14045.3.camel@mtkswgap22> <28211d08700d1e4876a9aea342e8fcb79534cd2c.camel@gmail.com> <862483add1462510b809aee6d3678435@codeaurora.org> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org On Wed, 2020-12-23 at 09:31 +0800, Can Guo wrote: > I don't see why removing the sysfs nodes during ufshcd_shutdown() is > a > concern to customer - we should do whatever is needed to protect LLD > contexts from user space intervene. What do you think? The sysfs nodes can be removed only when the device is remvoed. Bean