From 31494cf3532cfee0bf5c913ac9962971aab7b1d4 Mon Sep 17 00:00:00 2001 From: Gavin Shan Date: Fri, 23 Jan 2015 14:25:06 +1100 Subject: powerpc/powernv: Don't alloc IRQ map if necessary On PowerNV platform, the OPAL interrupts are exported by firmware through device-node property (/ibm,opal::opal-interrupts). Under some extreme circumstances (e.g. simulator), we don't have this property found from the device tree. For that case, we shouldn't allocate the interrupt map. Otherwise, slab complains allocating zero sized memory chunk. Signed-off-by: Gavin Shan Signed-off-by: Michael Ellerman --- arch/powerpc/platforms/powernv/opal.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'arch/powerpc/platforms/powernv/opal.c') diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index 933c7fbd6b54..18fd4e71c9c1 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -708,11 +708,12 @@ static void __init opal_irq_init(struct device_node *dn) /* Get interrupt property */ irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); - pr_debug("Found %d interrupts reserved for OPAL\n", - irqs ? (irqlen / 4) : 0); + opal_irq_count = irqs ? (irqlen / 4) : 0; + pr_debug("Found %d interrupts reserved for OPAL\n", opal_irq_count); + if (!opal_irq_count) + return; /* Install interrupt handlers */ - opal_irq_count = irqlen / 4; opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); for (i = 0; irqs && i < opal_irq_count; i++, irqs++) { unsigned int irq, virq; -- cgit v1.2.3