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cpufreq: propagate errors returned from __cpufreq_governor()

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Return codes aren't honored properly in cpufreq_set_policy(). This can
lead to two problems:
- wrong errors propagated to sysfs
- we try to do next state-change even if the previous one failed

cpufreq_governor_dbs() now returns proper errors on all invalid
state-transition requests and this code should honor that.

Reviewed-and-tested-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2015-07-18 11:31:03 +05:30 committed by Rafael J. Wysocki
parent 871ef3b53a
commit 4bc384ae62
1 changed files with 24 additions and 7 deletions
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31
drivers/cpufreq/cpufreq.c
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@ -2295,16 +2295,31 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
old_gov = policy->governor;
/* end old governor */
if (old_gov) {
__cpufreq_governor(policy, CPUFREQ_GOV_STOP);
ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP);
if (ret) {
/* This can happen due to race with other operations */
pr_debug("%s: Failed to Stop Governor: %s (%d)\n",
__func__, old_gov->name, ret);
return ret;
}
up_write(&policy->rwsem);
__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
down_write(&policy->rwsem);
if (ret) {
pr_err("%s: Failed to Exit Governor: %s (%d)\n",
__func__, old_gov->name, ret);
return ret;
}
}
/* start new governor */
policy->governor = new_policy->governor;
if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) {
if (!__cpufreq_governor(policy, CPUFREQ_GOV_START))
ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT);
if (!ret) {
ret = __cpufreq_governor(policy, CPUFREQ_GOV_START);
if (!ret)
goto out;
up_write(&policy->rwsem);
@ -2316,11 +2331,13 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
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);
if (__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT))
policy->governor = NULL;
else
__cpufreq_governor(policy, CPUFREQ_GOV_START);
}
return -EINVAL;
return ret;
out:
pr_debug("governor: change or update limits\n");