linux-kernel - [PATCH 1/2] irqchip/gic: Loudly complain about the use of IRQ_TYPE

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Date:   Fri, 16 Mar 2018 14:55:10 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>
Subject: [PATCH 1/2] irqchip/gic: Loudly complain about the use of IRQ_TYPE_NONE

There is a huge number of broken device trees out there. Just
grepping through the tree for the use of IRQ_TYPE_NONE in conjunction
with the GIC is scary.

People just don't realise that IRQ_TYPE_NONE just doesn't exist, and
you just get whatever junk was there before. So let's make them aware
of the issue.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 drivers/irqchip/irq-gic.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 79801c24800b..ac2e62d613d1 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1011,6 +1011,9 @@ static int gic_irq_domain_translate(struct irq_domain *d,
 			*hwirq += 16;
 
 		*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
+
+		/* Make it clear that broken DTs are... broken */
+		WARN_ON(*type == IRQ_TYPE_NONE);
 		return 0;
 	}
 
@@ -1020,6 +1023,8 @@ static int gic_irq_domain_translate(struct irq_domain *d,
 
 		*hwirq = fwspec->param[0];
 		*type = fwspec->param[1];
+
+		WARN_ON(*type == IRQ_TYPE_NONE);
 		return 0;
 	}
 
-- 
2.14.2