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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 A1792C48BE5 for ; Sat, 12 Jun 2021 07:13:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 87BF361186 for ; Sat, 12 Jun 2021 07:13:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230443AbhFLHPb (ORCPT ); Sat, 12 Jun 2021 03:15:31 -0400 Received: from so254-9.mailgun.net ([198.61.254.9]:60036 "EHLO so254-9.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230028AbhFLHP3 (ORCPT ); Sat, 12 Jun 2021 03:15:29 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1623482010; h=Message-ID: References: In-Reply-To: Subject: Cc: To: From: Date: Content-Transfer-Encoding: Content-Type: MIME-Version: Sender; bh=dSTq7/FJmXNvVcUhDXUN+9uGuplltG1LiEo4dgdMqR8=; b=RsPz1YvV/G6JfthiA5KpvBqN6Uw6EH4GZ1R9tW1vh6B1spWZWaYR1TnOSimy4SKnw/yjmp8u KSI5eocHFCSizwrs4+u/R0GHjImg7wGyn/K7CKkUljhIKW8aH+juq/amjp7NZiNemdwzs3Ui FCaq3sB6awrrwhPAh3e6vmVMT1g= X-Mailgun-Sending-Ip: 198.61.254.9 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-west-2.postgun.com with SMTP id 60c45e99e570c05619a7a799 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Sat, 12 Jun 2021 07:13:29 GMT Sender: cang=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 744ECC43145; Sat, 12 Jun 2021 07:13:29 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: cang) by smtp.codeaurora.org (Postfix) with ESMTPSA id A143DC4338A; Sat, 12 Jun 2021 07:13:28 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Sat, 12 Jun 2021 15:13:28 +0800 From: Can Guo To: Bart Van Assche Cc: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, ziqichen@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, Alim Akhtar , Avri Altman , "James E.J. Bottomley" , "Martin K. Petersen" , Adrian Hunter , Bean Huo , Stanley Chu , Keoseong Park , Jaegeuk Kim , Dinghao Liu , "Gustavo A. R. Silva" , Kiwoong Kim , Satya Tangirala , open list Subject: Re: [PATCH v3 9/9] scsi: ufs: Apply more limitations to user access In-Reply-To: References: <1623300218-9454-1-git-send-email-cang@codeaurora.org> <1623300218-9454-10-git-send-email-cang@codeaurora.org> Message-ID: X-Sender: cang@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021-06-12 05:03, Bart Van Assche wrote: > On 6/9/21 9:43 PM, Can Guo wrote: >> Do not let user access HW if hba resume fails or hba is not in good >> state, >> otherwise it may lead to various stability issues. > > Just like for the previous patch, I'm wondering whether or not such a > failure perhaps indicates a hardware bug? > Indeed yes, but user access happens when power/clock is not ready will lead to system stability issues, e.g., OCP or unclocked register access. Nowadays, customers are heavily using UFS sysfs nodes during runtime, so our test teams added quite a lot test scripts to simulate user access to UFS sysfs nodes during their test. Thanks, Can Guo. > Thanks, > > Bart.