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intel_pstate: Use del_timer_sync in intel_pstate_cpu_stop

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Ensure that no timer callback is running since we are about to free
the timer structure.  We cannot guarantee that the call back is called
on the CPU where the timer is running.

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dirk Brandewie 2014-03-24 07:41:29 -07:00 committed by Rafael J. Wysocki
parent 0c5aa405a9
commit c2294a2f78
1 changed files with 1 additions and 1 deletions
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2
drivers/cpufreq/intel_pstate.c
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@ -778,7 +778,7 @@ static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
pr_info("intel_pstate CPU %d exiting\n", cpu_num);
del_timer(&all_cpu_data[cpu_num]->timer);
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;