--- kernel/irq/chip.c	2019-07-13 09:28:23.683787367 +0800
+++ /tmp/chip.c	2019-10-08 11:32:35.082258572 +0800
@@ -432,8 +432,8 @@ void unmask_irq(struct irq_desc *desc)
 		return;
 
 	if (desc->irq_data.chip->irq_unmask) {
-		desc->irq_data.chip->irq_unmask(&desc->irq_data);
 		irq_state_clr_masked(desc);
+		desc->irq_data.chip->irq_unmask(&desc->irq_data);
 	}
 }