PM / OPP: Add opp_rcu_lockdep_assert() to _find_device_opp()
_find_device_opp() should be called with rcu-read lock or dev_opp_list_lock held. Add the opp_rcu_lockdep_assert() check to make sure caller have taken appropriate locks. Fix comment over the routine as well. Suggested-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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