This is a note to let you know that I've just added the patch titled
PM: QoS: Restore support for default value on frequency QoS
to the 6.4-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:
pm-qos-restore-support-for-default-value-on-frequency-qos.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3a8395b565b5b4f019b3dc182be4c4541eb35ac8 Mon Sep 17 00:00:00 2001
From: Chungkai Yang <Chung-kai.Yang@xxxxxxxxxxxx>
Date: Wed, 5 Jul 2023 16:59:07 +0800
Subject: PM: QoS: Restore support for default value on frequency QoS
From: Chungkai Yang <Chung-kai.Yang@xxxxxxxxxxxx>
commit 3a8395b565b5b4f019b3dc182be4c4541eb35ac8 upstream.
Commit 8d36694245f2 ("PM: QoS: Add check to make sure CPU freq is
non-negative") makes sure CPU freq is non-negative to avoid negative
value converting to unsigned data type. However, when the value is
PM_QOS_DEFAULT_VALUE, pm_qos_update_target specifically uses
c->default_value which is set to FREQ_QOS_MIN/MAX_DEFAULT_VALUE when
cpufreq_policy_alloc is executed, for this case handling.
Adding check for PM_QOS_DEFAULT_VALUE to let default setting work will
fix this problem.
Fixes: 8d36694245f2 ("PM: QoS: Add check to make sure CPU freq is non-negative")
Link: https://lore.kernel.org/lkml/20230626035144.19717-1-Chung-kai.Yang@xxxxxxxxxxxx/
Link: https://lore.kernel.org/lkml/20230627071727.16646-1-Chung-kai.Yang@xxxxxxxxxxxx/
Link: https://lore.kernel.org/lkml/CAJZ5v0gxNOWhC58PHeUhW_tgf6d1fGJVZ1x91zkDdht11yUv-A@xxxxxxxxxxxxxx/
Signed-off-by: Chungkai Yang <Chung-kai.Yang@xxxxxxxxxxxx>
Cc: 6.0+ <stable@xxxxxxxxxxxxxxx> # 6.0+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/power/qos.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -426,6 +426,11 @@ late_initcall(cpu_latency_qos_init);
/* Definitions related to the frequency QoS below. */
+static inline bool freq_qos_value_invalid(s32 value)
+{
+ return value < 0 && value != PM_QOS_DEFAULT_VALUE;
+}
+
/**
* freq_constraints_init - Initialize frequency QoS constraints.
* @qos: Frequency QoS constraints to initialize.
@@ -531,7 +536,7 @@ int freq_qos_add_request(struct freq_con
{
int ret;
- if (IS_ERR_OR_NULL(qos) || !req || value < 0)
+ if (IS_ERR_OR_NULL(qos) || !req || freq_qos_value_invalid(value))
return -EINVAL;
if (WARN(freq_qos_request_active(req),
@@ -563,7 +568,7 @@ EXPORT_SYMBOL_GPL(freq_qos_add_request);
*/
int freq_qos_update_request(struct freq_qos_request *req, s32 new_value)
{
- if (!req || new_value < 0)
+ if (!req || freq_qos_value_invalid(new_value))
return -EINVAL;
if (WARN(!freq_qos_request_active(req),
Patches currently in stable-queue which might be from Chung-kai.Yang@xxxxxxxxxxxx are
queue-6.4/pm-qos-restore-support-for-default-value-on-frequency-qos.patch
