intel_pstate: Use del_timer_sync in intel_pstate_cpu_stop
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: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NDirk Brandewie <dirk.j.brandewie@intel.com> Reviewed-by: NSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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