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From: Andrej Gelenberg on 14 May 2010 06:50
i found the cause for the bug: it was commit "[CPUFREQ] remove rwsem
lock from CPUFREQ_GOV_STOP call (second call site)".
It release the rwsem lock in the middle of __cpufreq_set_policy, that is
not a good idea. There are no dead lock, which that patch solved,
because cpufreq_ondemand and cpufreq_conservative don't use the rwsem
lock in do_dbs_timer anymore.