Hello,

i checked the sources of the linux kernel with the static code analysis tool cppcheck. It found a memory leak at file :linux-2.6.31-rc4/arch/powerpc/sysdev/ipic.c at line 739

Take a look at the source:

struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
{
	struct ipic	*ipic;
	struct resource res;
	u32 temp = 0, ret;

	ret = of_address_to_resource(node, 0, &res);
	if (ret)
		return NULL;

	ipic = kzalloc(sizeof(*ipic), GFP_KERNEL);
	if (ipic == NULL)
		return NULL;

	ipic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
				       NR_IPIC_INTS,
				       &ipic_host_ops, 0);
	if (ipic->irqhost == NULL)
739		return NULL;
....

Indeed, the function returns without freeing the memory. A possible solution might be:

struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
{
	struct ipic	*ipic;
	struct resource res;
	u32 temp = 0, ret;

	ret = of_address_to_resource(node, 0, &res);
	if (ret)
		return NULL;

	ipic = kzalloc(sizeof(*ipic), GFP_KERNEL);
	if (ipic == NULL)
		return NULL;

	ipic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
				       NR_IPIC_INTS,
				       &ipic_host_ops, 0);
	if (ipic->irqhost == NULL)
        {
           kfree(ipic);
           return NULL;
        }

....

Best regards

Ettl Martin