From patchwork Tue May 12 11:08:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bernard Zhao X-Patchwork-Id: 213372 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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 D60B2C54E8B for ; Tue, 12 May 2020 11:08:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BFE42206DD for ; Tue, 12 May 2020 11:08:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726891AbgELLIp (ORCPT ); Tue, 12 May 2020 07:08:45 -0400 Received: from mail-m17613.qiye.163.com ([59.111.176.13]:24014 "EHLO mail-m17613.qiye.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728085AbgELLIo (ORCPT ); Tue, 12 May 2020 07:08:44 -0400 Received: from ubuntu.localdomain (unknown [157.0.31.122]) by mail-m17613.qiye.163.com (Hmail) with ESMTPA id 06A8A482D55; Tue, 12 May 2020 19:08:39 +0800 (CST) From: Bernard Zhao To: Lukasz Luba , Kukjin Kim , Krzysztof Kozlowski , linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: opensource.kernel@vivo.com, Bernard Zhao Subject: [PATCH v2] memory/samsung: reduce unnecessary mutex lock area Date: Tue, 12 May 2020 04:08:27 -0700 Message-Id: <20200512110827.39475-1-bernard@vivo.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZT1VITEtCQkJDSkhLTEJDSFlXWShZQU hPN1dZLVlBSVdZCQ4XHghZQVk1NCk2OjckKS43PlkG X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Nj46LCo*UTg8GTJWFAI1Sk1P OjYKCRNVSlVKTkNCSUNKTElJSUNDVTMWGhIXVRkeCRUaCR87DRINFFUYFBZFWVdZEgtZQVlKTkxV S1VISlVKSUlZV1kIAVlBSUlPTjcG X-HM-Tid: 0a720892839793bakuws06a8a482d55 Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Maybe dmc->df->lock seems not needed to protect "if (ret) & dev_warn" branch. Maybe this change speed up the code a bit. Signed-off-by: Bernard Zhao ---- Changes since v1: *change release lock before the if statement. *revert dmc->df->lock mutex lock to protect function exynos5_dmc_perf_events_check Link for V1: *https://lore.kernel.org/patchwork/patch/1238888/ --- drivers/memory/samsung/exynos5422-dmc.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c index 22a43d662833..25196d6268e2 100644 --- a/drivers/memory/samsung/exynos5422-dmc.c +++ b/drivers/memory/samsung/exynos5422-dmc.c @@ -1346,15 +1346,13 @@ static irqreturn_t dmc_irq_thread(int irq, void *priv) struct exynos5_dmc *dmc = priv; mutex_lock(&dmc->df->lock); - exynos5_dmc_perf_events_check(dmc); - res = update_devfreq(dmc->df); + mutex_unlock(&dmc->df->lock); + if (res) dev_warn(dmc->dev, "devfreq failed with %d\n", res); - mutex_unlock(&dmc->df->lock); - return IRQ_HANDLED; }