intel_pstate: Don't lose sysfs settings during cpu offline

commit c0348717 upstream.

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

Link: https://bugzilla.kernel.org/show_bug.cgi?id=80651Reported-by: Tobias Jakobi <liquid.acid@gmx.net>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
[ kamal: backport to 3.13-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

drivers/cpufreq/intel_pstate.c

@@ -711,7 +711,9 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
 	if (!id)
 		return -ENODEV;
 
-	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;
 
@@ -799,8 +801,6 @@ static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
 	int cpu = policy->cpu;
 
 	del_timer(&all_cpu_data[cpu]->timer);
-	kfree(all_cpu_data[cpu]);
-	all_cpu_data[cpu] = NULL;
 	return 0;
 }