| Message ID | 20220615144321.262773-3-pierre.gondois@arm.com |
|---|---|
| State | New |
| Headers | show |
| Series | cpufreq: qcom-hw: LMH irq/hotplug interractions | expand |
diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index 8aba73698eda..8cad3744cff4 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -461,7 +461,7 @@ static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy) { struct qcom_cpufreq_data *data = policy->driver_data; - if (data->throttle_irq <= 0) + if (data->throttle_irq < 0) return 0; mutex_lock(&data->throttle_lock); @@ -470,6 +470,7 @@ static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy) cancel_delayed_work_sync(&data->throttle_work); irq_set_affinity_hint(data->throttle_irq, NULL); + disable_irq_nosync(data->throttle_irq); return 0; }
If LMH (Limits Management Hardware) is available, when a policy is disabled by unplugging the last online CPU of policy->cpus, the LMH irq is left enabled. When the policy is re-enabled with any of the CPU in policy->cpus being plugged in, qcom_cpufreq_ready() re-enables the irq. This triggers the following warning: [ 379.160106] Unbalanced enable for IRQ 154 [ 379.160120] WARNING: CPU: 7 PID: 48 at kernel/irq/manage.c:774 __enable_irq+0x84/0xc0 Thus disable the irq. This patch also makes the check against throttle_irq consistent, 0 being theoretically valid. Fixes: a1eb080a0447 ("cpufreq: qcom-hw: provide online/offline operations") Signed-off-by: Pierre Gondois <pierre.gondois@arm.com> --- drivers/cpufreq/qcom-cpufreq-hw.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)