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cpufreq: Remove temporary fix for race between CPU hotplug and sysfs-writes 

Commit "cpufreq: serialize calls to __cpufreq_governor()" had been a temporary
and partial solution to the race condition between writing to a cpufreq sysfs
file and taking a CPU offline. Now that we have a proper and complete solution
to that problem, remove the temporary fix.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Srivatsa S. Bhat 2013-09-07 01:23:55 +05:30 committed by Rafael J. Wysocki
parent 4f750c9308
commit 56d07db274
2 changed files with 1 additions and 7 deletions
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7
drivers/cpufreq/cpufreq.c
View File

@ -1739,15 +1739,13 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
policy->cpu, event);
mutex_lock(&cpufreq_governor_lock);
if (policy->governor_busy
|| (policy->governor_enabled && event == CPUFREQ_GOV_START)
if ((policy->governor_enabled && event == CPUFREQ_GOV_START)
|| (!policy->governor_enabled
&& (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) {
mutex_unlock(&cpufreq_governor_lock);
return -EBUSY;
}
policy->governor_busy = true;
if (event == CPUFREQ_GOV_STOP)
policy->governor_enabled = false;
else if (event == CPUFREQ_GOV_START)
@ -1776,9 +1774,6 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
((event == CPUFREQ_GOV_POLICY_EXIT) && !ret))
module_put(policy->governor->owner);
mutex_lock(&cpufreq_governor_lock);
policy->governor_busy = false;
mutex_unlock(&cpufreq_governor_lock);
return ret;
}

1
include/linux/cpufreq.h
View File

@ -76,7 +76,6 @@ struct cpufreq_policy {
struct cpufreq_governor *governor; /* see below */
void *governor_data;
bool governor_enabled; /* governor start/stop flag */
bool governor_busy;
struct work_struct update; /* if update_policy() needs to be
* called, but you're in IRQ context */