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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: 275157b367 ("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>
This commit is contained in:
Vladimir Zapolskiy 2021-11-11 17:48:07 +02:00 committed by Viresh Kumar
parent be6592ed56
commit e0e27c3d4e
1 changed files with 2 additions and 2 deletions
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4
drivers/cpufreq/qcom-cpufreq-hw.c
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@ -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 = {