linux-kernel - [PATCH] irq: fix crash due to op-less irq domains

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Date:	Wed, 14 Dec 2011 21:55:56 +0100
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	<linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] irq: fix crash due to op-less irq domains

From: Linus Walleij <linus.walleij@...aro.org>

IRQ domains without ops does not work anymore after commit
"irq: support domains with non-zero hwirq base", since the
check dereferences domain->ops->to_irq without checking of
domain->ops are NULL. This makes U300 (and probably most other
systems using the PL190 VIC) boot again.

Cc: Rob Herring <rob.herring@...xeda.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 include/linux/irqdomain.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 99834e58..78a1e66 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -74,7 +74,7 @@ struct irq_domain {
 static inline unsigned int irq_domain_to_irq(struct irq_domain *d,
 					     unsigned long hwirq)
 {
-	if (d->ops->to_irq)
+	if (d->ops && d->ops->to_irq)
 		return d->ops->to_irq(d, hwirq);
 	if (WARN_ON(hwirq < d->hwirq_base))
 		return 0;
-- 
1.7.3.2

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