From: Gavin Shan Date: Fri, 23 Jan 2015 03:25:06 +0000 (+1100) Subject: powerpc/powernv: Don't alloc IRQ map if necessary X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=31494cf3532cfee0bf5c913ac9962971aab7b1d4;p=linux-beck.git 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 --- 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;