static int tsi148_alloc_resource()

in bridges/vme_tsi148.c [715:789]

• 60 lines of code
• 9 McCabe index (conditional complexity)

static int tsi148_alloc_resource(struct vme_master_resource *image,
	unsigned long long size)
{
	unsigned long long existing_size;
	int retval = 0;
	struct pci_dev *pdev;
	struct vme_bridge *tsi148_bridge;

	tsi148_bridge = image->parent;

	pdev = to_pci_dev(tsi148_bridge->parent);

	existing_size = (unsigned long long)(image->bus_resource.end -
		image->bus_resource.start);

	/* If the existing size is OK, return */
	if ((size != 0) && (existing_size == (size - 1)))
		return 0;

	if (existing_size != 0) {
		iounmap(image->kern_base);
		image->kern_base = NULL;
		kfree(image->bus_resource.name);
		release_resource(&image->bus_resource);
		memset(&image->bus_resource, 0, sizeof(image->bus_resource));
	}

	/* Exit here if size is zero */
	if (size == 0)
		return 0;

	if (!image->bus_resource.name) {
		image->bus_resource.name = kmalloc(VMENAMSIZ+3, GFP_ATOMIC);
		if (!image->bus_resource.name) {
			retval = -ENOMEM;
			goto err_name;
		}
	}

	sprintf((char *)image->bus_resource.name, "%s.%d", tsi148_bridge->name,
		image->number);

	image->bus_resource.start = 0;
	image->bus_resource.end = (unsigned long)size;
	image->bus_resource.flags = IORESOURCE_MEM;

	retval = pci_bus_alloc_resource(pdev->bus,
		&image->bus_resource, size, 0x10000, PCIBIOS_MIN_MEM,
		0, NULL, NULL);
	if (retval) {
		dev_err(tsi148_bridge->parent, "Failed to allocate mem "
			"resource for window %d size 0x%lx start 0x%lx\n",
			image->number, (unsigned long)size,
			(unsigned long)image->bus_resource.start);
		goto err_resource;
	}

	image->kern_base = ioremap(
		image->bus_resource.start, size);
	if (!image->kern_base) {
		dev_err(tsi148_bridge->parent, "Failed to remap resource\n");
		retval = -ENOMEM;
		goto err_remap;
	}

	return 0;

err_remap:
	release_resource(&image->bus_resource);
err_resource:
	kfree(image->bus_resource.name);
	memset(&image->bus_resource, 0, sizeof(image->bus_resource));
err_name:
	return retval;
}