linux-kernel - [PATCH v7 1/3] ARM: irqchip: mxs: do panic if icoll

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Date:	Mon, 12 Oct 2015 21:15:30 +0200
From:	Oleksij Rempel <linux@...pel-privat.de>
To:	linux-kernel@...r.kernel.org, marc.zyngier@....com,
	jason@...edaemon.net, tglx@...utronix.de
Cc:	Oleksij Rempel <linux@...pel-privat.de>
Subject: [PATCH v7 1/3] ARM: irqchip: mxs: do panic if icoll_base == NULL

Current code will only WARN_ON() and dereference the NULL pointer.
In this case it is better to panic and stop execution.

Signed-off-by: Oleksij Rempel <linux@...pel-privat.de>
---
 drivers/irqchip/irq-mxs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-mxs.c b/drivers/irqchip/irq-mxs.c
index 604df63..ce69860 100644
--- a/drivers/irqchip/irq-mxs.c
+++ b/drivers/irqchip/irq-mxs.c
@@ -97,7 +97,8 @@ static int __init icoll_of_init(struct device_node *np,
 			  struct device_node *interrupt_parent)
 {
 	icoll_base = of_iomap(np, 0);
-	WARN_ON(!icoll_base);
+	if (!icoll_base)
+		panic("%s: unable to map resource", np->full_name);
 
 	/*
 	 * Interrupt Collector reset, which initializes the priority
-- 
2.1.4

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