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authorViresh Kumar <viresh.kumar@linaro.org>2013-06-19 10:16:55 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-06-27 21:49:55 +0200
commit7c30ed532cf798a8d924562f2f44d03d7652f7a7 (patch)
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cpufreq: make sure frequency transitions are serialized
Whenever we are changing frequency of a cpu, we are calling PRECHANGE and POSTCHANGE notifiers. They must be serialized. i.e. PRECHANGE or POSTCHANGE shouldn't be called twice contiguously. This can happen due to bugs in users of __cpufreq_driver_target() or actual cpufreq drivers who are sending these notifiers. This patch adds some protection against this. Now, we keep track of the last transaction and see if something went wrong. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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