linux-kernel - [PATCH 05/12] irqdomain: Fix irq_create_direct_mapping() to test irq

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Message-Id: <1339822897-15840-6-git-send-email-grant.likely@secretlab.ca>
Date:	Fri, 15 Jun 2012 23:01:30 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	linux-kernel@...r.kernel.org
Cc:	Milton Miller <miltonm@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Paul Mundt <lethal@...ux-sh.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <rob.herring@...xeda.com>
Subject: [PATCH 05/12] irqdomain: Fix irq_create_direct_mapping() to test irq_domain type.

irq_create_direct_mapping can only be used with the NOMAP type.  Make
the function test to ensure it is passed the correct type of
irq_domain.

Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
Cc: Paul Mundt <lethal@...ux-sh.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Rob Herring <rob.herring@...xeda.com>
---
 kernel/irq/irqdomain.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 79a7711..0483e27 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -447,8 +447,8 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain)
 	if (domain == NULL)
 		domain = irq_default_domain;
 
-	BUG_ON(domain == NULL);
-	WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP);
+	if (WARN_ON(!domain || domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP))
+		return 0;
 
 	virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
 	if (!virq) {
-- 
1.7.9.5

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