From patchwork Thu Sep 3 20:20:07 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 7119191 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 49055BEEC1 for ; Thu, 3 Sep 2015 20:23:15 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5CF5120713 for ; Thu, 3 Sep 2015 20:23:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6408020708 for ; Thu, 3 Sep 2015 20:23:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751808AbbICUXM (ORCPT ); Thu, 3 Sep 2015 16:23:12 -0400 Received: from sauhun.de ([89.238.76.85]:48401 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751700AbbICUXM (ORCPT ); Thu, 3 Sep 2015 16:23:12 -0400 Received: from p4fe253c4.dip0.t-ipconnect.de ([79.226.83.196]:39704 helo=localhost) by pokefinder.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1ZXb2L-0003QM-9p; Thu, 03 Sep 2015 22:23:09 +0200 From: Wolfram Sang To: linux-i2c@vger.kernel.org Cc: linux-sh@vger.kernel.org, Magnus Damm , Simon Horman , Laurent Pinchart , Geert Uytterhoeven , Wolfram Sang , Kuninori Morimoto , Yoshihiro Kaneko , Sergei Shtylyov Subject: [PATCH 3/9] i2c: rcar: remove spinlock Date: Thu, 3 Sep 2015 22:20:07 +0200 Message-Id: <1441311613-2681-4-git-send-email-wsa@the-dreams.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1441311613-2681-1-git-send-email-wsa@the-dreams.de> References: <1441311613-2681-1-git-send-email-wsa@the-dreams.de> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Wolfram Sang We make sure to reinit the HW in the timeout case; then we know that interrupts are always disabled in the sections protected by the spinlock. Thus, we can simply remove it which is a preparation for further refactoring. While here, rename the timeout variable to time_left which is way more readable. Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-rcar.c | 23 ++++------------------- 1 file changed, 4 insertions(+), 19 deletions(-) diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 3594cdab2573b6..e65418b34d868e 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -34,7 +34,6 @@ #include #include #include -#include /* register offsets */ #define ICSCR 0x00 /* slave ctrl */ @@ -110,7 +109,6 @@ struct rcar_i2c_priv { struct i2c_msg *msg; struct clk *clk; - spinlock_t lock; wait_queue_head_t wait; int pos; @@ -428,9 +426,6 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr) irqreturn_t result = IRQ_HANDLED; u32 msr; - /*-------------- spin lock -----------------*/ - spin_lock(&priv->lock); - if (rcar_i2c_slave_irq(priv)) goto exit; @@ -477,9 +472,6 @@ out: } exit: - spin_unlock(&priv->lock); - /*-------------- spin unlock -----------------*/ - return result; } @@ -489,9 +481,8 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap, { struct rcar_i2c_priv *priv = i2c_get_adapdata(adap); struct device *dev = rcar_i2c_priv_to_dev(priv); - unsigned long flags; int i, ret; - long timeout; + long time_left; pm_runtime_get_sync(dev); @@ -506,9 +497,6 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap, break; } - /*-------------- spin lock -----------------*/ - spin_lock_irqsave(&priv->lock, flags); - /* init each data */ priv->msg = &msgs[i]; priv->pos = 0; @@ -518,13 +506,11 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap, rcar_i2c_prepare_msg(priv); - spin_unlock_irqrestore(&priv->lock, flags); - /*-------------- spin unlock -----------------*/ - - timeout = wait_event_timeout(priv->wait, + time_left = wait_event_timeout(priv->wait, rcar_i2c_flags_has(priv, ID_DONE), adap->timeout); - if (!timeout) { + if (!time_left) { + rcar_i2c_init(priv); ret = -ETIMEDOUT; break; } @@ -658,7 +644,6 @@ static int rcar_i2c_probe(struct platform_device *pdev) irq = platform_get_irq(pdev, 0); init_waitqueue_head(&priv->wait); - spin_lock_init(&priv->lock); adap = &priv->adap; adap->nr = pdev->id;