archive mirror
 help / color / mirror / Atom feed
From: Daniel Lezcano <>
	"Kenneth R . Crudup" <>,
	kernel test robot <>,,,
	Daniel Lezcano <>, (open list)
Subject: [PATCH] powercap/drivers/dtpm_cpu: Fix suspend failure and kernel warning
Date: Mon,  8 Nov 2021 07:23:44 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <20211107095001.GC11442@xsang-OptiPlex-9020>

When the ENERGY_MODEL and DTPM_CPU are enabled but actually without
any energy model, at cpu hotplug time, the dead cpuhp callback fails
leading to the warning.

Actually, the check could be simplified and we only do an action if
the dtpm cpu is enabled, otherwise we bail out without error.

Fixes: 7a89d7eacf8e ("powercap/drivers/dtpm: Simplify the dtpm table")
Reported-by: Kenneth R. Crudup <>
Tested-by: Kenneth R. Crudup <>
Reported-by: kernel test robot <>
Signed-off-by: Daniel Lezcano <>
 drivers/powercap/dtpm_cpu.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/powercap/dtpm_cpu.c b/drivers/powercap/dtpm_cpu.c
index 69eb5101b5c7..477042199d90 100644
--- a/drivers/powercap/dtpm_cpu.c
+++ b/drivers/powercap/dtpm_cpu.c
@@ -166,16 +166,13 @@ static struct dtpm_ops dtpm_ops = {
 static int cpuhp_dtpm_cpu_offline(unsigned int cpu)
-	struct em_perf_domain *pd;
 	struct dtpm_cpu *dtpm_cpu;
-	pd = em_cpu_get(cpu);
-	if (!pd)
-		return -EINVAL;
 	dtpm_cpu = per_cpu(dtpm_per_cpu, cpu);
+	if (dtpm_cpu)
+		dtpm_update_power(&dtpm_cpu->dtpm);
-	return dtpm_update_power(&dtpm_cpu->dtpm);
+	return 0;
 static int cpuhp_dtpm_cpu_online(unsigned int cpu)

       reply	other threads:[~2021-11-08  6:24 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20211107095001.GC11442@xsang-OptiPlex-9020>
2021-11-08  6:23 ` Daniel Lezcano [this message]
2021-11-10 20:19   ` Rafael J. Wysocki

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \ \
    --subject='Re: [PATCH] powercap/drivers/dtpm_cpu: Fix suspend failure and kernel warning' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).