linux-kernel - [PATCH 5.18 070/102] cpufreq: qcom-hw: Dont do lmh things without a throttle interrupt

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Message-Id: <20220705115620.393287150@linuxfoundation.org>
Date:   Tue,  5 Jul 2022 13:58:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Rob Clark <robdclark@...omium.org>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH 5.18 070/102] cpufreq: qcom-hw: Dont do lmh things without a throttle interrupt

From: Stephen Boyd <swboyd@...omium.org>

commit 668a7a12ded7077d4fd7ad1305667e559907e5bb upstream.

Offlining cpu6 and cpu7 and then onlining cpu6 hangs on
sc7180-trogdor-lazor because the throttle interrupt doesn't exist.
Similarly, things go sideways when suspend/resume runs. That's because
the qcom_cpufreq_hw_cpu_online() and qcom_cpufreq_hw_lmh_exit()
functions are calling genirq APIs with an interrupt value of '-6', i.e.
-ENXIO, and that isn't good.

Check the value of the throttle interrupt like we already do in other
functions in this file and bail out early from lmh code to fix the hang.

Reported-by: Rob Clark <robdclark@...omium.org>
Cc: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Fixes: a1eb080a0447 ("cpufreq: qcom-hw: provide online/offline operations")
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/cpufreq/qcom-cpufreq-hw.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index 0253731d6d25..36c79580fba2 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -442,6 +442,9 @@ static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy)
 	struct platform_device *pdev = cpufreq_get_driver_data();
 	int ret;
 
+	if (data->throttle_irq <= 0)
+		return 0;
+
 	ret = irq_set_affinity_hint(data->throttle_irq, policy->cpus);
 	if (ret)
 		dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n",
@@ -469,6 +472,9 @@ static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy)
 
 static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data)
 {
+	if (data->throttle_irq <= 0)
+		return;
+
 	free_irq(data->throttle_irq, data);
 }
 
-- 
2.37.0