linux-kernel - [PATCH] Fix ARM LPC32XX platform broken by older commit

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Message-Id: <E1ZEELu-0000eM-U8@luxik.cdi.cz>
Date:	Sun, 12 Jul 2015 12:00:01 +0200
From:	Martin Devera <devik@....cz>
To:	unlisted-recipients:; (no To-header on input)
Subject: [PATCH] Fix ARM LPC32XX platform broken by older commit

In commit a71b092a9c68685a270ebdde7b5986ba8787e575
__handle_domain_irq was introduced by Marc Zyngier.
It tests hwirq on zero and rejects it. At least
LPC32XX uses IRQ 0 as chained entry for SIC1. Thus
all SIC1 connected devices doesn't work just now.
This patch fixes it - not sure whether it is correct
way however.
---
 kernel/irq/irqdesc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 99793b9..3c90794 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -381,7 +381,7 @@ int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
 	 * Some hardware gives randomly wrong interrupts.  Rather
 	 * than crashing, do something sensible.
 	 */
-	if (unlikely(!irq || irq >= nr_irqs)) {
+	if (unlikely(irq >= nr_irqs)) {
 		ack_bad_irq(irq);
 		ret = -EINVAL;
 	} else {
-- 
1.7.10.4

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