cpufreq: qcom-hw: Delay enabling throttle_irq

In the event that the SoC is under thermal pressure while booting it's
possible for the dcvs notification to happen inbetween the cpufreq
framework calling init and it actually updating the policy's
related_cpus cpumask.

Prior to the introduction of the thermal pressure update helper an empty
cpumask would simply result in the thermal pressure of no cpus being
updated, but the new code will attempt to dereference an invalid per_cpu
variable.

Avoid this problem by using the newly reintroduced "ready" callback, to
postpone enabling the IRQ until the related_cpus cpumask is filled in.

Fixes: 0258cb19 ("cpufreq: qcom-cpufreq-hw: Use new thermal pressure update function")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/qcom-cpufreq-hw.c

@@ -388,7 +388,7 @@ static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index)
 
 	snprintf(data->irq_name, sizeof(data->irq_name), "dcvsh-irq-%u", policy->cpu);
 	ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq,
-				   IRQF_ONESHOT, data->irq_name, data);
+				   IRQF_ONESHOT | IRQF_NO_AUTOEN, data->irq_name, data);
 	if (ret) {
 		dev_err(&pdev->dev, "Error registering %s: %d\n", data->irq_name, ret);
 		return 0;
@@ -542,6 +542,14 @@ static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
 	return 0;
 }
 
+static void qcom_cpufreq_ready(struct cpufreq_policy *policy)
+{
+	struct qcom_cpufreq_data *data = policy->driver_data;
+
+	if (data->throttle_irq >= 0)
+		enable_irq(data->throttle_irq);
+}
+
 static struct freq_attr *qcom_cpufreq_hw_attr[] = {
 	&cpufreq_freq_attr_scaling_available_freqs,
 	&cpufreq_freq_attr_scaling_boost_freqs,
@@ -561,6 +569,7 @@ static struct cpufreq_driver cpufreq_qcom_hw_driver = {
 	.fast_switch    = qcom_cpufreq_hw_fast_switch,
 	.name		= "qcom-cpufreq-hw",
 	.attr		= qcom_cpufreq_hw_attr,
+	.ready		= qcom_cpufreq_ready,
 };
 
 static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)