powercap: DTPM: Check for Energy Model type

The Energy Model power values might be artificial. In such case
it's safe to bail out during the registration, since the PowerCap
framework supports only micro-Watts.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/powercap/dtpm_cpu.c b/drivers/powercap/dtpm_cpu.c
index bca2f912d3496f3435552d6a1377562c31159c79..f5eced0842b36d158cf18a2c648482513a4496cc 100644 (file)
--- a/drivers/powercap/dtpm_cpu.c
+++ b/drivers/powercap/dtpm_cpu.c
@@ -211,7 +211,7 @@ static int __dtpm_cpu_setup(int cpu, struct dtpm *parent)
                return 0;
 
        pd = em_cpu_get(cpu);
-       if (!pd)
+       if (!pd || em_is_artificial(pd))
                return -EINVAL;
 
        dtpm_cpu = kzalloc(sizeof(*dtpm_cpu), GFP_KERNEL);