From patchwork Thu Jun 2 14:04:56 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Viresh Kumar X-Patchwork-Id: 69170 Delivered-To: patch@linaro.org Received: by 10.140.106.246 with SMTP id e109csp136601qgf; Thu, 2 Jun 2016 07:06:04 -0700 (PDT) X-Received: by 10.98.59.133 with SMTP id w5mr4847816pfj.69.1464876364379; Thu, 02 Jun 2016 07:06:04 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id i63si711594pfa.231.2016.06.02.07.06.04; Thu, 02 Jun 2016 07:06:04 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161178AbcFBOFt (ORCPT + 31 others); Thu, 2 Jun 2016 10:05:49 -0400 Received: from mail-pa0-f45.google.com ([209.85.220.45]:36170 "EHLO mail-pa0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161152AbcFBOFq (ORCPT ); Thu, 2 Jun 2016 10:05:46 -0400 Received: by mail-pa0-f45.google.com with SMTP id te7so2759310pab.3 for ; Thu, 02 Jun 2016 07:05:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=L+30wkQ1t+XHPfhvr82ra6QPMpAxiWBmrS2QE9BEyCg=; b=RlvLjlBlz5kg/Zy0M0BlLaeMqQbcVhFBmO7d3DSFuLgVMmqjckHPd5a/0zav12MnvP /5sfcAC8GnUhB9aiSnkzEg6382qqThYWjef+I63/UpYg1Dzib9bB7BVn4cQ4sSTh8+b5 3RBNuz7igSN7dtN89VZRSYlnHkld16dsIFgBk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=L+30wkQ1t+XHPfhvr82ra6QPMpAxiWBmrS2QE9BEyCg=; b=DctjsBrtawjyhHOjeGEQXNEr88Jl4Imd5ft+P+GUEqaqzR2YsS8ZozItk5B8eh+vqM xr0mrr6AD1Za1PBSBK5oOJp2JBZPlXvuIMCwi1gAVQ6k8bZlVKa6Im1q/8EaV9GSUdH1 qwqK1W6Ja96aj2E0kpXTR9EgvoqJQjZ4/1Ddw6uiWnGXXPvLMIn2+xRW8ScVZCmuCKK3 xVYUnClE+OhBjRBS/yqjQm7+NzNUuxpTKXn5agUSkZdnEp2iN3X5yCq/7Cii5Qujsnwd tMi5MS5kYdXkNzYKA2DKUbGGASeBGdZ00JZXvNjyts9HBMvCqUioGJMfzoIMaUOtkKg9 biOA== X-Gm-Message-State: ALyK8tJElhvVyANG1nW3WHPkr0YZM2YWoDNEsyB60I0ejrud9oSA4cJ6woUp/9iMQQ9EkzcY X-Received: by 10.66.131.75 with SMTP id ok11mr5753405pab.87.1464876345829; Thu, 02 Jun 2016 07:05:45 -0700 (PDT) Received: from localhost ([122.167.17.193]) by smtp.gmail.com with ESMTPSA id xn3sm70640964pab.32.2016.06.02.07.05.44 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 02 Jun 2016 07:05:44 -0700 (PDT) From: Viresh Kumar To: Rafael Wysocki , Viresh Kumar , Amit Daniel Kachhap , Javi Merino , Zhang Rui , Eduardo Valentin Cc: linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH V2 2/6] cpufreq: Remove cpufreq_frequency_get_table() Date: Thu, 2 Jun 2016 19:34:56 +0530 Message-Id: <13d43ddfe208a9b387fe0fd247de069ba0332308.1464876229.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 2.7.1.410.g6faf27b In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Most of the callers of cpufreq_frequency_get_table() already have the pointer to a valid 'policy' structure and they don't really need to go through the per-cpu variable first and then a check to validate the frequency, in order to find the freq-table for the policy. Directly use the policy->freq_table field instead for them. Only one user of that API is left after above changes, cpu_cooling.c and it accesses the freq_table in a racy way as the policy can get freed in between. Fix it by using cpufreq_cpu_get() properly. Since there are no more users of cpufreq_frequency_get_table() left, get rid of it. Signed-off-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 38 +++++++++++++---------------------- drivers/cpufreq/cpufreq_ondemand.c | 2 +- drivers/cpufreq/cpufreq_stats.c | 3 +-- drivers/cpufreq/freq_table.c | 9 +++------ drivers/cpufreq/ppc_cbe_cpufreq_pmi.c | 3 +-- drivers/thermal/cpu_cooling.c | 22 +++++++++++++++----- include/linux/cpufreq.h | 2 -- 7 files changed, 37 insertions(+), 42 deletions(-) -- 2.7.1.410.g6faf27b diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index fbc97b1fa371..1833eda1f9d4 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -126,15 +126,6 @@ struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy) } EXPORT_SYMBOL_GPL(get_governor_parent_kobj); -struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu) -{ - struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); - - return policy && !policy_is_inactive(policy) ? - policy->freq_table : NULL; -} -EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table); - static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) { u64 idle_time; @@ -1950,7 +1941,7 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy, if (!cpufreq_driver->target_index) return -EINVAL; - freq_table = cpufreq_frequency_get_table(policy->cpu); + freq_table = policy->freq_table; if (unlikely(!freq_table)) { pr_err("%s: Unable to find freq_table\n", __func__); return -EINVAL; @@ -2345,26 +2336,25 @@ static struct notifier_block __refdata cpufreq_cpu_notifier = { *********************************************************************/ static int cpufreq_boost_set_sw(int state) { - struct cpufreq_frequency_table *freq_table; struct cpufreq_policy *policy; int ret = -EINVAL; for_each_active_policy(policy) { - freq_table = cpufreq_frequency_get_table(policy->cpu); - if (freq_table) { - ret = cpufreq_frequency_table_cpuinfo(policy, - freq_table); - if (ret) { - pr_err("%s: Policy frequency update failed\n", - __func__); - break; - } + if (!policy->freq_table) + continue; - down_write(&policy->rwsem); - policy->user_policy.max = policy->max; - cpufreq_governor_limits(policy); - up_write(&policy->rwsem); + ret = cpufreq_frequency_table_cpuinfo(policy, + policy->freq_table); + if (ret) { + pr_err("%s: Policy frequency update failed\n", + __func__); + break; } + + down_write(&policy->rwsem); + policy->user_policy.max = policy->max; + cpufreq_governor_limits(policy); + up_write(&policy->rwsem); } return ret; diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index c84fc2240d49..4d2fe2710c5d 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -113,7 +113,7 @@ static void ondemand_powersave_bias_init(struct cpufreq_policy *policy) { struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); - dbs_info->freq_table = cpufreq_frequency_get_table(policy->cpu); + dbs_info->freq_table = policy->freq_table; dbs_info->freq_lo = 0; } diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c index c6e7f81a0397..06d3abdffd3a 100644 --- a/drivers/cpufreq/cpufreq_stats.c +++ b/drivers/cpufreq/cpufreq_stats.c @@ -157,11 +157,10 @@ void cpufreq_stats_create_table(struct cpufreq_policy *policy) unsigned int i = 0, count = 0, ret = -ENOMEM; struct cpufreq_stats *stats; unsigned int alloc_size; - unsigned int cpu = policy->cpu; struct cpufreq_frequency_table *pos, *table; /* We need cpufreq table for creating stats table */ - table = cpufreq_frequency_get_table(cpu); + table = policy->freq_table; if (unlikely(!table)) return; diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c index 4e5c5dbfed7a..f52b5473b1f4 100644 --- a/drivers/cpufreq/freq_table.c +++ b/drivers/cpufreq/freq_table.c @@ -106,12 +106,10 @@ EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify); */ int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy) { - struct cpufreq_frequency_table *table = - cpufreq_frequency_get_table(policy->cpu); - if (!table) + if (!policy->freq_table) return -ENODEV; - return cpufreq_frequency_table_verify(policy, table); + return cpufreq_frequency_table_verify(policy, policy->freq_table); } EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify); @@ -210,9 +208,8 @@ EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target); int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, unsigned int freq) { - struct cpufreq_frequency_table *pos, *table; + struct cpufreq_frequency_table *pos, *table = policy->freq_table; - table = cpufreq_frequency_get_table(policy->cpu); if (unlikely(!table)) { pr_debug("%s: Unable to find frequency table\n", __func__); return -ENOENT; diff --git a/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c b/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c index 7c4cd5c634f2..dc112481a408 100644 --- a/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c +++ b/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c @@ -94,7 +94,7 @@ static int pmi_notifier(struct notifier_block *nb, unsigned long event, void *data) { struct cpufreq_policy *policy = data; - struct cpufreq_frequency_table *cbe_freqs; + struct cpufreq_frequency_table *cbe_freqs = policy->freq_table; u8 node; /* Should this really be called for CPUFREQ_ADJUST and CPUFREQ_NOTIFY @@ -103,7 +103,6 @@ static int pmi_notifier(struct notifier_block *nb, if (event == CPUFREQ_START) return 0; - cbe_freqs = cpufreq_frequency_get_table(policy->cpu); node = cbe_cpu_to_node(policy->cpu); pr_debug("got notified, event=%lu, node=%u\n", event, node); diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c index 6ceac4f2d4b2..63f760869651 100644 --- a/drivers/thermal/cpu_cooling.c +++ b/drivers/thermal/cpu_cooling.c @@ -787,6 +787,7 @@ __cpufreq_cooling_register(struct device_node *np, const struct cpumask *clip_cpus, u32 capacitance, get_static_t plat_static_func) { + struct cpufreq_policy *policy; struct thermal_cooling_device *cool_dev; struct cpufreq_cooling_device *cpufreq_dev; char dev_name[THERMAL_NAME_LENGTH]; @@ -794,15 +795,24 @@ __cpufreq_cooling_register(struct device_node *np, unsigned int freq, i, num_cpus; int ret; - table = cpufreq_frequency_get_table(cpumask_first(clip_cpus)); + policy = cpufreq_cpu_get(cpumask_first(clip_cpus)); + if (!policy) { + pr_debug("%s: CPUFreq policy not found\n", __func__); + return ERR_PTR(-EPROBE_DEFER); + } + + table = policy->freq_table; if (!table) { pr_debug("%s: CPUFreq table not found\n", __func__); - return ERR_PTR(-EPROBE_DEFER); + cool_dev = ERR_PTR(-ENODEV); + goto put_policy; } cpufreq_dev = kzalloc(sizeof(*cpufreq_dev), GFP_KERNEL); - if (!cpufreq_dev) - return ERR_PTR(-ENOMEM); + if (!cpufreq_dev) { + cool_dev = ERR_PTR(-ENOMEM); + goto put_policy; + } num_cpus = cpumask_weight(clip_cpus); cpufreq_dev->time_in_idle = kcalloc(num_cpus, @@ -892,7 +902,7 @@ __cpufreq_cooling_register(struct device_node *np, CPUFREQ_POLICY_NOTIFIER); mutex_unlock(&cooling_cpufreq_lock); - return cool_dev; + goto put_policy; remove_idr: release_idr(&cpufreq_idr, cpufreq_dev->id); @@ -906,6 +916,8 @@ __cpufreq_cooling_register(struct device_node *np, kfree(cpufreq_dev->time_in_idle); free_cdev: kfree(cpufreq_dev); +put_policy: + cpufreq_cpu_put(policy); return cool_dev; } diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 7ed93c310c08..1342cbc0f25e 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -632,8 +632,6 @@ static inline bool policy_has_boost_freq(struct cpufreq_policy *policy) return false; } #endif -/* the following funtion is for cpufreq core use only */ -struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); /* the following are really really optional */ extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;