cpufreq: ondemand: use all CPUs in update_sampling_rate

Modify update_sampling_rate() to check, and eventually immediately
schedule, all CPU's do_dbs_timer delayed work.

This is required in case of software coordinated CPUs, as we now have a
separate delayed work for each CPU.
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq_ondemand.c

@@ -326,7 +326,7 @@ static void update_sampling_rate(unsigned int new_rate)
 			cpufreq_cpu_put(policy);
 			continue;
 		}
-		dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu);
+		dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
 		cpufreq_cpu_put(policy);
 
 		mutex_lock(&dbs_info->cdbs.timer_mutex);
@@ -345,8 +345,7 @@ static void update_sampling_rate(unsigned int new_rate)
 			cancel_delayed_work_sync(&dbs_info->cdbs.work);
 			mutex_lock(&dbs_info->cdbs.timer_mutex);
 
-			schedule_delayed_work_on(dbs_info->cdbs.cpu,
-					&dbs_info->cdbs.work,
+			schedule_delayed_work_on(cpu, &dbs_info->cdbs.work,
 					usecs_to_jiffies(new_rate));
 
 		}