linux-kernel - [PATCH v2 1/4] genirq: Walk the irq_data hierarchy when resending an interrupt

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Date:   Thu,  3 Sep 2020 19:32:03 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Jason Cooper <jason@...edaemon.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Valentin Schneider <valentin.schneider@....com>,
        kernel-team@...roid.com
Subject: [PATCH v2 1/4] genirq: Walk the irq_data hierarchy when resending an interrupt

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

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 kernel/irq/resend.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
index c48ce19a257f..8ccd32a0cc80 100644
--- a/kernel/irq/resend.c
+++ b/kernel/irq/resend.c
@@ -86,6 +86,18 @@ static int irq_sw_resend(struct irq_desc *desc)
 }
 #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
  *
@@ -113,8 +125,7 @@ int check_irq_resend(struct irq_desc *desc, bool inject)
 
 	desc->istate &= ~IRQS_PENDING;
 
-	if (!desc->irq_data.chip->irq_retrigger ||
-	    !desc->irq_data.chip->irq_retrigger(&desc->irq_data))
+	if (!try_retrigger(desc))
 		err = irq_sw_resend(desc);
 
 	/* If the retrigger was successfull, mark it with the REPLAY bit */
-- 
2.28.0