This is a note to let you know that I've just added the patch titled
powercap: dtpm_cpu: Fix error check against freq_qos_add_request()
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powercap-dtpm_cpu-fix-error-check-against-freq_qos_a.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d77cd3de77f62f715afb7ccda9483a133e3d3868
Author: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Date: Tue Feb 13 23:39:47 2024 +0100
powercap: dtpm_cpu: Fix error check against freq_qos_add_request()
[ Upstream commit b50155cb0d609437236c88201206267835c6f965 ]
The caller of the function freq_qos_add_request() checks again a non
zero value but freq_qos_add_request() can return '1' if the request
already exists. Therefore, the setup function fails while the QoS
request actually did not failed.
Fix that by changing the check against a negative value like all the
other callers of the function.
Fixes: 0e8f68d7f0485 ("Add CPU energy model based support")
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/powercap/dtpm_cpu.c b/drivers/powercap/dtpm_cpu.c
index 9193c3b8edebe..ae7ee611978ba 100644
--- a/drivers/powercap/dtpm_cpu.c
+++ b/drivers/powercap/dtpm_cpu.c
@@ -219,7 +219,7 @@ static int __dtpm_cpu_setup(int cpu, struct dtpm *parent)
ret = freq_qos_add_request(&policy->constraints,
&dtpm_cpu->qos_req, FREQ_QOS_MAX,
pd->table[pd->nr_perf_states - 1].frequency);
- if (ret)
+ if (ret < 0)
goto out_dtpm_unregister;
cpufreq_cpu_put(policy);
