From e0e27c3d4e20dab861566f1c348ae44e4b498630 Mon Sep 17 00:00:00 2001
From: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Date: Thu, 11 Nov 2021 17:48:07 +0200
Subject: [PATCH] cpufreq: qcom-hw: Fix probable nested interrupt handling
Re-enabling an interrupt from its own interrupt handler may cause
an interrupt storm, if there is a pending interrupt and because its
handling is disabled due to already done entrance into the handler
above in the stack.
Also, apparently it is improper to lock a mutex in an interrupt contex.
Fixes: 275157b367f4 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support")
Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/cpufreq/qcom-cpufreq-hw.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index 63c11e7dfba08..5b609e205435f 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -335,9 +335,9 @@ static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data)
/* Disable interrupt and enable polling */
disable_irq_nosync(c_data->throttle_irq);
- qcom_lmh_dcvs_notify(c_data);
+ schedule_delayed_work(&c_data->throttle_work, 0);
- return 0;
+ return IRQ_HANDLED;
}
static const struct qcom_cpufreq_soc_data qcom_soc_data = {
--
2.30.2