From patchwork Thu Feb 14 01:30:41 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 1041751 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=chromium.org header.i=@chromium.org header.b="FGkq8uFl"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 440JkW1019z9sML for ; Thu, 14 Feb 2019 12:30:59 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732717AbfBNBa6 (ORCPT ); Wed, 13 Feb 2019 20:30:58 -0500 Received: from mail-pl1-f194.google.com ([209.85.214.194]:36264 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732144AbfBNBa5 (ORCPT ); Wed, 13 Feb 2019 20:30:57 -0500 Received: by mail-pl1-f194.google.com with SMTP id g9so2192825plo.3 for ; Wed, 13 Feb 2019 17:30:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=GsKUef20fAh07gfu78gOpr0DjYw/ko20eGV0n0JBmK0=; b=FGkq8uFlHwkBTIIdmp61J0sT/E2AoufEZBgiUVgOfGl1IJq1vgzHtk89MLVZ9ChNE6 Lu6NkZrK/S4kXAEWkN82Vxp2jIQ++s43HLRESAWUipffbH/ezxz8Esato/IWUohJmugo 3Q4S3Qg9SUuLwBTxiZm2LtORx9cS0VkAPdm7c= 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=GsKUef20fAh07gfu78gOpr0DjYw/ko20eGV0n0JBmK0=; b=J+TEaRn/PPJ+pQA+X0kejyTqNH5mCQ2EjwtWGcwp7KcybJ9oPhGi7E8sXucrXnlgma 5dSBna7Xs0FmO85VvoSTtBQqmCHBXL6rkKNwYxmKRX20gzoA6+wQ7xSRyESD7AqQjlIZ wWq8jXHkEbk/KcRH7+zptqL7QXaTTcGlHiE0iP98aBcS2EGDtSmjOeLQcRKCBI5Qa1jq B+5YCUHU9Zn9AVKkP/shH94xaf5Wmb62/Q7k97O5J74cOIcg+PS4AKxQ5tok17JM1F/O q8Rqj/aXRFH+PqCIqFEJAtoHPy6Y5Pej8EkULd924DFOkpA8cleSZ61StHi7pMoe8Uym WtCg== X-Gm-Message-State: AHQUAuZOc3yXvmw83IFkcP6JA/ft9AQgXvpxi7k+BDDQSNClZaO60V9D PVKwnlW9SApsl0vPztesUN/VgA== X-Google-Smtp-Source: AHgI3Iawq8vLr9FK/kXBVRcj1L9gwW2DAP72ex0uB2sqO6q1P3TxM8FsANVXz6YDF7YZ5GVK/KlsOg== X-Received: by 2002:a17:902:7086:: with SMTP id z6mr1345620plk.125.1550107856301; Wed, 13 Feb 2019 17:30:56 -0800 (PST) Received: from mka.mtv.corp.google.com ([2620:15c:202:1:75a:3f6e:21d:9374]) by smtp.gmail.com with ESMTPSA id p64sm811072pfi.56.2019.02.13.17.30.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 13 Feb 2019 17:30:55 -0800 (PST) From: Matthias Kaehlcke To: MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Thierry Reding , Jonathan Hunter , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, Lukasz Luba Cc: Matthias Kaehlcke Subject: [PATCH 3/4] PM / devfreq: Add devfreq_governor_start/stop() Date: Wed, 13 Feb 2019 17:30:41 -0800 Message-Id: <20190214013042.254790-4-mka@chromium.org> X-Mailer: git-send-email 2.20.1.791.gb4d0f1c61a-goog In-Reply-To: <20190214013042.254790-1-mka@chromium.org> References: <20190214013042.254790-1-mka@chromium.org> MIME-Version: 1.0 Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org The following pattern is repeated multiple times: - call governor event handler with DEVFREQ_GOV_START/STOP - check return value - in case of error log a message Add devfreq_governor_start/stop() helper functions with this code and call them instead. Signed-off-by: Matthias Kaehlcke --- drivers/devfreq/devfreq.c | 96 +++++++++++++++++++++++---------------- 1 file changed, 58 insertions(+), 38 deletions(-) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 7fab6c4cf719b..eb86461648d74 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -580,6 +580,53 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, return ret; } +/** + * devfreq_governor_start() - Start the devfreq governor of the device. + * @devfreq: the devfreq instance + */ +static int devfreq_governor_start(struct devfreq *devfreq) +{ + struct device *dev = devfreq->dev.parent; + int err; + + if (WARN(mutex_is_locked(&devfreq->lock), + "mutex must *not* be held by the caller\n")) + return -EINVAL; + + err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, + NULL); + if (err) { + dev_err(dev, "Governor %s not started: %d\n", + devfreq->governor->name, err); + return err; + } + + return 0; +} + +/** + * devfreq_governor_stop() - Stop the devfreq governor of the device. + * @devfreq: the devfreq instance + */ +static int devfreq_governor_stop(struct devfreq *devfreq) +{ + struct device *dev = devfreq->dev.parent; + int err; + + if (WARN(mutex_is_locked(&devfreq->lock), + "mutex must *not* be held by the caller\n")) + return -EINVAL; + + err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_STOP, NULL); + if (err) { + dev_warn(dev, "%s: Governor %s not stopped: %d\n", + devfreq->governor->name, err); + return err; + } + + return 0; +} + /** * devfreq_dev_release() - Callback for struct device to release the device. * @dev: the devfreq device @@ -720,13 +767,9 @@ struct devfreq *devfreq_add_device(struct device *dev, } devfreq->governor = governor; - err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, - NULL); - if (err) { - dev_err(dev, "%s: Unable to start governor for the device\n", - __func__); + err = devfreq_governor_start(devfreq); + if (err) goto err_init; - } list_add(&devfreq->node, &devfreq_list); @@ -1029,24 +1072,13 @@ int devfreq_add_governor(struct devfreq_governor *governor) dev_warn(dev, "%s: Governor %s already present\n", __func__, devfreq->governor->name); - ret = devfreq->governor->event_handler(devfreq, - DEVFREQ_GOV_STOP, NULL); - if (ret) { - dev_warn(dev, - "%s: Governor %s stop = %d\n", - __func__, - devfreq->governor->name, ret); - } + ret = devfreq_governor_stop(devfreq); + /* Fall through */ } + devfreq->governor = governor; - ret = devfreq->governor->event_handler(devfreq, - DEVFREQ_GOV_START, NULL); - if (ret) { - dev_warn(dev, "%s: Governor %s start=%d\n", - __func__, devfreq->governor->name, - ret); - } + devfreq_governor_start(devfreq); } } @@ -1081,7 +1113,6 @@ int devfreq_remove_governor(struct devfreq_governor *governor) goto err_out; } list_for_each_entry(devfreq, &devfreq_list, node) { - int ret; struct device *dev = devfreq->dev.parent; if (!strncmp(devfreq->governor_name, governor->name, @@ -1093,13 +1124,8 @@ int devfreq_remove_governor(struct devfreq_governor *governor) continue; /* Fall through */ } - ret = devfreq->governor->event_handler(devfreq, - DEVFREQ_GOV_STOP, NULL); - if (ret) { - dev_warn(dev, "%s: Governor %s stop=%d\n", - __func__, devfreq->governor->name, - ret); - } + + devfreq_governor_stop(devfreq); devfreq->governor = NULL; } } @@ -1149,19 +1175,13 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr, } if (df->governor) { - ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); - if (ret) { - dev_warn(dev, "%s: Governor %s not stopped(%d)\n", - __func__, df->governor->name, ret); + ret = devfreq_governor_stop(df); + if (ret) goto out; - } } df->governor = governor; strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN); - ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); - if (ret) - dev_warn(dev, "%s: Governor %s not started(%d)\n", - __func__, df->governor->name, ret); + ret = devfreq_governor_start(df); out: mutex_unlock(&devfreq_list_lock);