There is a circular dependency between cpu_hotplug.lock and
HMP scheduler policy mutex. Prevent this by enforcing the
same lock order.
Here CPU0 and CPU4 are governed by different cpufreq policies.
---------------- --------------------
CPU 0 CPU 4
--------------- --------------------
proc_sys_call_handler() cpu_up()
--> acquired cpu_hotplug.lock
sched_hmp_proc_update_handler() cpufreq_cpu_callback()
--> acquired policy_mutex
cpufreq_governor_interactive()
get_online_cpus() sched_set_window()
--> waiting for cpu_hotplug.lock --> waiting for policy_mutex
Change-Id: I39efc394f4f00815b72adc975021fdb16fe6e30a
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
f67dcbea7f