int ccio_allocate_resource()

in ccio-dma.c [1444:1480]

• 33 lines of code
• 8 McCabe index (conditional complexity)

int ccio_allocate_resource(const struct parisc_device *dev,
		struct resource *res, unsigned long size,
		unsigned long min, unsigned long max, unsigned long align)
{
	struct resource *parent = &iomem_resource;
	struct ioc *ioc = ccio_get_iommu(dev);
	if (!ioc)
		goto out;

	parent = ioc->mmio_region;
	if (parent->parent &&
	    !allocate_resource(parent, res, size, min, max, align, NULL, NULL))
		return 0;

	if ((parent + 1)->parent &&
	    !allocate_resource(parent + 1, res, size, min, max, align,
				NULL, NULL))
		return 0;

	if (!expand_ioc_area(parent, size, min, max, align)) {
		__raw_writel(((parent->start)>>16) | 0xffff0000,
			     &ioc->ioc_regs->io_io_low);
		__raw_writel(((parent->end)>>16) | 0xffff0000,
			     &ioc->ioc_regs->io_io_high);
	} else if (!expand_ioc_area(parent + 1, size, min, max, align)) {
		parent++;
		__raw_writel(((parent->start)>>16) | 0xffff0000,
			     &ioc->ioc_regs->io_io_low_hv);
		__raw_writel(((parent->end)>>16) | 0xffff0000,
			     &ioc->ioc_regs->io_io_high_hv);
	} else {
		return -EBUSY;
	}

 out:
	return allocate_resource(parent, res, size, min, max, align, NULL,NULL);
}