Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753699AbaBQAv3 (ORCPT ); Sun, 16 Feb 2014 19:51:29 -0500 Received: from v094114.home.net.pl ([79.96.170.134]:56497 "HELO v094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752987AbaBQAv2 (ORCPT ); Sun, 16 Feb 2014 19:51:28 -0500 From: "Rafael J. Wysocki" To: Linux PM list Cc: Viresh Kumar , Linux Kernel Mailing List , "Srivatsa S. Bhat" Subject: [PATCH] cpufreq: Refactor cpufreq_set_policy() Date: Mon, 17 Feb 2014 02:06:15 +0100 Message-ID: <3582112.BRVGbkstFm@vostro.rjw.lan> User-Agent: KMail/4.11.5 (Linux/3.13.0+; KDE/4.11.5; x86_64; ; ) MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafael J. Wysocki Reduce the rampant usage of goto and the indentation level in cpufreq_set_policy() to improve the readability of that code. No functional changes should result from that. Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 102 ++++++++++++++++++++-------------------------- 1 file changed, 45 insertions(+), 57 deletions(-) Index: linux-pm/drivers/cpufreq/cpufreq.c =================================================================== --- linux-pm.orig/drivers/cpufreq/cpufreq.c +++ linux-pm/drivers/cpufreq/cpufreq.c @@ -2018,22 +2018,21 @@ EXPORT_SYMBOL(cpufreq_get_policy); static int cpufreq_set_policy(struct cpufreq_policy *policy, struct cpufreq_policy *new_policy) { - int ret = 0, failed = 1; + struct cpufreq_governor *old_gov; + int ret; pr_debug("setting new policy for CPU %u: %u - %u kHz\n", new_policy->cpu, new_policy->min, new_policy->max); memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); - if (new_policy->min > policy->max || new_policy->max < policy->min) { - ret = -EINVAL; - goto error_out; - } + if (new_policy->min > policy->max || new_policy->max < policy->min) + return -EINVAL; /* verify the cpu speed can be set within this limit */ ret = cpufreq_driver->verify(new_policy); if (ret) - goto error_out; + return ret; /* adjust if necessary - all reasons */ blocking_notifier_call_chain(&cpufreq_policy_notifier_list, @@ -2049,7 +2048,7 @@ static int cpufreq_set_policy(struct cpu */ ret = cpufreq_driver->verify(new_policy); if (ret) - goto error_out; + return ret; /* notification of the new policy */ blocking_notifier_call_chain(&cpufreq_policy_notifier_list, @@ -2064,58 +2063,47 @@ static int cpufreq_set_policy(struct cpu if (cpufreq_driver->setpolicy) { policy->policy = new_policy->policy; pr_debug("setting range\n"); - ret = cpufreq_driver->setpolicy(new_policy); - } else { - if (new_policy->governor != policy->governor) { - /* save old, working values */ - struct cpufreq_governor *old_gov = policy->governor; - - pr_debug("governor switch\n"); - - /* end old governor */ - if (policy->governor) { - __cpufreq_governor(policy, CPUFREQ_GOV_STOP); - up_write(&policy->rwsem); - __cpufreq_governor(policy, - CPUFREQ_GOV_POLICY_EXIT); - down_write(&policy->rwsem); - } - - /* start new governor */ - policy->governor = new_policy->governor; - if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) { - if (!__cpufreq_governor(policy, CPUFREQ_GOV_START)) { - failed = 0; - } else { - up_write(&policy->rwsem); - __cpufreq_governor(policy, - CPUFREQ_GOV_POLICY_EXIT); - down_write(&policy->rwsem); - } - } - - if (failed) { - /* new governor failed, so re-start old one */ - pr_debug("starting governor %s failed\n", - policy->governor->name); - if (old_gov) { - policy->governor = old_gov; - __cpufreq_governor(policy, - CPUFREQ_GOV_POLICY_INIT); - __cpufreq_governor(policy, - CPUFREQ_GOV_START); - } - ret = -EINVAL; - goto error_out; - } - /* might be a policy change, too, so fall through */ - } - pr_debug("governor: change or update limits\n"); - ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); + return cpufreq_driver->setpolicy(new_policy); } + if (new_policy->governor == policy->governor) + goto out; + + pr_debug("governor switch\n"); + + /* save old, working values */ + old_gov = policy->governor; + /* end old governor */ + if (old_gov) { + __cpufreq_governor(policy, CPUFREQ_GOV_STOP); + up_write(&policy->rwsem); + __cpufreq_governor(policy,CPUFREQ_GOV_POLICY_EXIT); + down_write(&policy->rwsem); + } + + /* start new governor */ + policy->governor = new_policy->governor; + if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) { + if (!__cpufreq_governor(policy, CPUFREQ_GOV_START)) + goto out; + + up_write(&policy->rwsem); + __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); + down_write(&policy->rwsem); + } + + /* new governor failed, so re-start old one */ + pr_debug("starting governor %s failed\n", policy->governor->name); + if (old_gov) { + policy->governor = old_gov; + __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); + __cpufreq_governor(policy, CPUFREQ_GOV_START); + } + + return -EINVAL; -error_out: - return ret; + out: + pr_debug("governor: change or update limits\n"); + return __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); } /** -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/