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=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 B37F5CA9ECB for ; Thu, 31 Oct 2019 22:55:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8143C20862 for ; Thu, 31 Oct 2019 22:55:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728314AbfJaWzf (ORCPT ); Thu, 31 Oct 2019 18:55:35 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:34302 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728207AbfJaWzf (ORCPT ); Thu, 31 Oct 2019 18:55:35 -0400 Received: by mail-pg1-f195.google.com with SMTP id e4so5115482pgs.1 for ; Thu, 31 Oct 2019 15:55:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=FVJPmx8UPR81L4aj+Pm8bXMN7xjG3Qf4UYlHj72sNng=; b=o4cE/G/oWlC3oCtTE249PQchYKXqDwKda65brmkozVNF1FemnIwuz9pZc4u/8xWW54 qc8wegEysvsWk039aM1TKX6gxcnhGHg6ASGAkh0xJ0wWAgcnN4oMF4qOSQqkLpKQrFeU kj7NNvoHvDz79tg8PuvrKJFHMu0eS+90anK7MAGg8Ek/VX5DHFOvoH8AmdMbZ1NdHTx8 5UtMjEmV15EBtPRe8k6PFyH1ZxqSLNcXu9QCeXmPYaAbf4UpFRlpLi4fApcpADJJc+xM iJTs/ICIwqPm7sy5UzFor+dS3FMX4O/GgdsHIVm0/AE3q9DhY0IvZZApnduEak847z3B VkaA== X-Gm-Message-State: APjAAAWG+EKIj2vN7Yb8mcS5nBSJ05woe3HIBSkd/HeFI8GIaZHseouS vFwK3CE/P0OYNBMPfijLWBm2b1AB X-Google-Smtp-Source: APXvYqw3kYQCAoQz78uZTSsf20MDpmSW2tFvoufVyPJFNka0u/4cpyk1urUehjUf6Cvt2dQbYYLMZA== X-Received: by 2002:a17:90a:a598:: with SMTP id b24mr11008290pjq.46.1572562534133; Thu, 31 Oct 2019 15:55:34 -0700 (PDT) Received: from desktop-bart.svl.corp.google.com ([2620:15c:2cd:202:4308:52a3:24b6:2c60]) by smtp.gmail.com with ESMTPSA id d139sm8391711pfd.162.2019.10.31.15.55.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 31 Oct 2019 15:55:33 -0700 (PDT) From: Bart Van Assche To: "Martin K . Petersen" , "James E . J . Bottomley" Cc: linux-scsi@vger.kernel.org, Christoph Hellwig , Bart Van Assche Subject: [PATCH 0/4] Simplify and optimize the UFS driver Date: Thu, 31 Oct 2019 15:55:24 -0700 Message-Id: <20191031225528.233895-1-bvanassche@acm.org> X-Mailer: git-send-email 2.24.0.rc0.303.g954a862665-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Hi Martin, While reading the UFS source code I noticed that some existing mechanisms are duplicated in this driver. These patches simplify and optimize the UFS driver. These patches are entirely untested. Bart. Bart Van Assche (4): ufs: Avoid busy-waiting by eliminating tag conflicts ufs: Simplify the clock scaling mechanism implementation ufs: Remove the SCSI timeout handler ufs: Remove superfluous memory barriers drivers/scsi/ufs/ufshcd.c | 288 +++++++++++--------------------------- drivers/scsi/ufs/ufshcd.h | 12 +- 2 files changed, 90 insertions(+), 210 deletions(-)