cpufreq: fix cpufreq suspend/resume for intel_pstate

commit 8e30444e153008e8eb3e74cbcb7a865bfcfb04a0 upstream.

Cpufreq core introduces cpufreq_suspended flag to let cpufreq sysfs nodes
across S2RAM/S2DISK. But the flag is only set in the cpufreq_suspend()
for cpufreq drivers which have target or target_index callback. This
skips intel_pstate driver. This patch is to set the flag before checking
target or target_index callback.

Fixes: 2f0aea936360 (cpufreq: suspend governors on system suspend/hibernate)
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
[rjw: Subject]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 0e8f8234f9b3f77f3f2ed734e7e8b0f0608023c1..1edeaad718df73594156de2df50c4bd1f741a67c 100644 (file)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1666,6 +1666,8 @@ void cpufreq_suspend(void)
        if (!cpufreq_driver)
                return;
 
+       cpufreq_suspended = true;
+
        if (!has_target())
                return;
 
@@ -1680,8 +1682,6 @@ void cpufreq_suspend(void)
                        pr_err("%s: Failed to suspend driver: %p\n", __func__,
                                policy);
        }
-
-       cpufreq_suspended = true;
 }
 
 /**
@@ -1697,13 +1697,13 @@ void cpufreq_resume(void)
        if (!cpufreq_driver)
                return;
 
+       cpufreq_suspended = false;
+
        if (!has_target())
                return;
 
        pr_debug("%s: Resuming Governors\n", __func__);
 
-       cpufreq_suspended = false;
-
        list_for_each_entry(policy, &cpufreq_policy_list, policy_list) {
                if (cpufreq_driver->resume && cpufreq_driver->resume(policy))
                        pr_err("%s: Failed to resume driver: %p\n", __func__,