On Tue, 19 Jul 2016, Eric Auger wrote:

+bool msi_doorbell_safe(void)
+{
+	struct irqchip_doorbell *db;
+	bool irq_remapping = true;
+
+	mutex_lock(&irqchip_doorbell_mutex);
+	list_for_each_entry(db, &irqchip_doorbell_list, next) {
+		irq_remapping &= db->info.irq_remapping;

db->info.irq_remapping is set in msi_doorbell_register(). So you can keep book
about that there. No need to iterate here.

Thanks,

	tglx