From: Willy Wolff willy.mh.wolff.ml@gmail.com
[ Upstream commit ff44f672d74178b3be19d41a169b98b3e391d4ce ]
When setting the cooling device current state from userspace via sysfs, the operation fails by returning an -EINVAL.
It appears the recent changes with the per-policy frequency QoS introduced a regression as reported by:
https://lkml.org/lkml/2020/3/20/599
The function freq_qos_update_request returns 0 or 1 describing update effectiveness, and a negative error code on failure. However, cpufreq_set_cur_state returns 0 on success or an error code otherwise.
Consider the QoS update as successful if the function does not return an error.
Fixes: 3000ce3c52f8b ("cpufreq: Use per-policy frequency QoS") Signed-off-by: Willy Wolff willy.mh.wolff.ml@gmail.com Acked-by: Viresh Kumar viresh.kumar@linaro.org Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Link: https://lore.kernel.org/r/20200321092740.7vvwfxsebcrznydh@macmini.local Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/thermal/cpu_cooling.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c index 52569b27b426f..d679e9a515c8e 100644 --- a/drivers/thermal/cpu_cooling.c +++ b/drivers/thermal/cpu_cooling.c @@ -430,6 +430,7 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) { struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata; + int ret;
/* Request state should be less than max_level */ if (WARN_ON(state > cpufreq_cdev->max_level)) @@ -441,8 +442,9 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
cpufreq_cdev->cpufreq_state = state;
- return freq_qos_update_request(&cpufreq_cdev->qos_req, - get_state_freq(cpufreq_cdev, state)); + ret = freq_qos_update_request(&cpufreq_cdev->qos_req, + get_state_freq(cpufreq_cdev, state)); + return ret < 0 ? ret : 0; }
/* Bind cpufreq callbacks to thermal cooling device ops */