linux-kernel - [PATCH 2/2] powercap: DTPM: Check Energy Model type for power values scale

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Message-Id: <20220207073036.14901-3-lukasz.luba@arm.com>
Date:   Mon,  7 Feb 2022 07:30:36 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     amit.kachhap@...il.com, daniel.lezcano@...aro.org,
        viresh.kumar@...aro.org, rafael@...nel.org, amitk@...nel.org,
        rui.zhang@...el.com, dietmar.eggemann@....com, lukasz.luba@....com,
        Pierre.Gondois@....com
Subject: [PATCH 2/2] powercap: DTPM: Check Energy Model type for power values scale

The Energy Model power values might be in an abstract scale. 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@....com>
---
 drivers/powercap/dtpm_cpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/powercap/dtpm_cpu.c b/drivers/powercap/dtpm_cpu.c
index b740866b228d..e6bcde081de4 100644
--- a/drivers/powercap/dtpm_cpu.c
+++ b/drivers/powercap/dtpm_cpu.c
@@ -188,7 +188,7 @@ static int cpuhp_dtpm_cpu_online(unsigned int cpu)
 		return 0;
 
 	pd = em_cpu_get(cpu);
-	if (!pd)
+	if (!pd || !(pd->flags & EM_PERF_DOMAIN_MILLIWATTS))
 		return -EINVAL;
 
 	dtpm_cpu = per_cpu(dtpm_per_cpu, cpu);
-- 
2.17.1