intel_pstate: Don't lose sysfs settings during cpu offline

The user may have custom settings don't destroy them during suspend.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=80651
Reported-by: Tobias Jakobi <liquid.acid@gmx.net>
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 5f5f5ed..97b349a 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -702,7 +702,9 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
 {
        struct cpudata *cpu;
 
-       all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), GFP_KERNEL);
+       if (!all_cpu_data[cpunum])
+               all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata),
+                                              GFP_KERNEL);
        if (!all_cpu_data[cpunum])
                return -ENOMEM;
 
@@ -783,8 +785,6 @@ static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
 
        del_timer_sync(&all_cpu_data[cpu_num]->timer);
        intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
-       kfree(all_cpu_data[cpu_num]);
-       all_cpu_data[cpu_num] = NULL;
 }
 
 static int intel_pstate_cpu_init(struct cpufreq_policy *policy)