@@ -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");
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> --- drivers/cpufreq/cpufreq.c | 31 ++++++++++++++++++++++++------- 1 file changed, 24 insertions(+), 7 deletions(-)