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irqchip/mxs: Panic if ioremap or domain creation fails

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Current code will only warn and then dereference the NULL pointer or
continue, which results in a fatal NULL pointer dereference later.

If the initialization fails, the machine is unusable, so panic right
away.

[ tglx: Massaged changelog and picked the irqdomain panic from the
  	next patch]

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Tested-by: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: marc.zyngier@arm.com
Cc: jason@lakedaemon.net
Link: http://lkml.kernel.org/r/1444677334-12242-2-git-send-email-linux@rempel-privat.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Oleksij Rempel 2015-10-12 21:15:30 +02:00 • committed by Thomas Gleixner
parent e7a46c8185
commit e59a8451be
1 changed files with 6 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

8
drivers/irqchip/irq-mxs.c
View file

@ -97,7 +97,8 @@ static int __init icoll_of_init(struct device_node *np,
struct device_node *interrupt_parent) struct device_node *interrupt_parent)
{ {
icoll_base = of_iomap(np, 0); 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 * Interrupt Collector reset, which initializes the priority
@ -107,6 +108,9 @@ static int __init icoll_of_init(struct device_node *np,
icoll_domain = irq_domain_add_linear(np, ICOLL_NUM_IRQS, icoll_domain = irq_domain_add_linear(np, ICOLL_NUM_IRQS,
&icoll_irq_domain_ops, NULL); &icoll_irq_domain_ops, NULL);
return icoll_domain ? 0 : -ENODEV; if (!icoll_domain)
panic("%s: unable to create irqdomain", np->full_name);
return 0;
} }
IRQCHIP_DECLARE(mxs, "fsl,icoll", icoll_of_init); IRQCHIP_DECLARE(mxs, "fsl,icoll", icoll_of_init);