Re: [Update][PATCH] cpufreq: Do not hold driver module references for additional policy CPUs
From: Rafael J. Wysocki <hidden>
Date: 2013-08-02 13:21:24
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On Friday, August 02, 2013 04:25:58 PM Viresh Kumar wrote:
On 2 August 2013 10:07, Viresh Kumar [off-list ref] wrote:quoted
quoted
@@ -908,7 +905,8 @@ static int cpufreq_add_policy_cpu(unsign unsigned long flags; policy = cpufreq_cpu_get(sibling);This can be skipped completely at this place. Caller of cpufreq_add_policy_cpu() has got the policy pointer with it and so can be passed. I haven't done it earlier as the impression was we need to call cpufreq_cpu_get()..And here is the fixup to do this (attached too):
Care to add a changelog? I'll apply this on top of my $subject patch, then. Thanks, Rafael
quoted hunk ↗ jump to hunk
--- drivers/cpufreq/cpufreq.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-)diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 46e70ae..47f2a6e 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c@@ -889,21 +889,17 @@ static void cpufreq_init_policy(structcpufreq_policy *policy) } #ifdef CONFIG_HOTPLUG_CPU -static int cpufreq_add_policy_cpu(unsigned int cpu, unsigned int sibling, - struct device *dev, bool frozen) +static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, + unsigned int cpu, struct device *dev, + bool frozen) { - struct cpufreq_policy *policy; int ret = 0, has_target = !!cpufreq_driver->target; unsigned long flags; - policy = cpufreq_cpu_get(sibling); - if (WARN_ON_ONCE(!policy)) - return -ENODATA; - if (has_target) __cpufreq_governor(policy, CPUFREQ_GOV_STOP); - lock_policy_rwsem_write(sibling); + lock_policy_rwsem_write(policy->cpu); write_lock_irqsave(&cpufreq_driver_lock, flags);@@ -912,7 +908,7 @@ static int cpufreq_add_policy_cpu(unsigned intcpu, unsigned int sibling, per_cpu(cpufreq_cpu_data, cpu) = policy; write_unlock_irqrestore(&cpufreq_driver_lock, flags); - unlock_policy_rwsem_write(sibling); + unlock_policy_rwsem_write(policy->cpu); if (has_target) { __cpufreq_governor(policy, CPUFREQ_GOV_START);@@ -923,7 +919,6 @@ static int cpufreq_add_policy_cpu(unsigned intcpu, unsigned int sibling, if (!frozen) ret = sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq"); - cpufreq_cpu_put(policy); return ret; } #endif@@ -1006,8 +1001,7 @@ static int __cpufreq_add_dev(struct device *dev,struct subsys_interface *sif, struct cpufreq_policy *cp = per_cpu(cpufreq_cpu_data, sibling); if (cp && cpumask_test_cpu(cpu, cp->related_cpus)) { read_unlock_irqrestore(&cpufreq_driver_lock, flags); - return cpufreq_add_policy_cpu(cpu, sibling, dev, - frozen); + return cpufreq_add_policy_cpu(cp, cpu, dev, frozen); } } read_unlock_irqrestore(&cpufreq_driver_lock, flags);
-- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.