genirq: Walk the irq_data hierarchy when resending an interrupt

mainline inclusion
from mainline-5.10
commit cd1752d3
category: bugfix
bugzilla: NA
CVE: NA

-------------------------------------------------

On resending an interrupt, we only check the outermost irqchip for
a irq_retrigger callback. However, this callback could be implemented
at an inner level. Use irq_chip_retrigger_hierarchy() in this case.

Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Liao Chang <liaochang1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>

kernel/irq/resend.c

@@ -49,6 +49,18 @@ static DECLARE_TASKLET(resend_tasklet, resend_irqs, 0);
 
 #endif
 
+static int try_retrigger(struct irq_desc *desc)
+{
+	if (desc->irq_data.chip->irq_retrigger)
+		return desc->irq_data.chip->irq_retrigger(&desc->irq_data);
+
+#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
+	return irq_chip_retrigger_hierarchy(&desc->irq_data);
+#else
+	return 0;
+#endif
+}
+
 /*
  * IRQ resend
  *
@@ -72,9 +84,7 @@ void check_irq_resend(struct irq_desc *desc)
 		desc->istate &= ~IRQS_PENDING;
 		desc->istate |= IRQS_REPLAY;
 
-		if ((!desc->irq_data.chip->irq_retrigger ||
-		    !desc->irq_data.chip->irq_retrigger(&desc->irq_data)) &&
-		    !handle_enforce_irqctx(&desc->irq_data)) {
+		if (!try_retrigger(desc)) {
 #ifdef CONFIG_HARDIRQS_SW_RESEND
 			unsigned int irq = irq_desc_get_irq(desc);