static int pci_create_attr()

in kernel/pci-sysfs.c [172:223]

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

static int pci_create_attr(struct pci_dev *pdev, int num)
{
	/* allocate attribute structure, piggyback attribute name */
	int retval, nlen1, nlen2 = 0, res_count = 1;
	unsigned long sparse_base, dense_base;
	struct bin_attribute *attr;
	struct pci_controller *hose = pdev->sysdata;
	char *suffix, *attr_name;

	suffix = "";	/* Assume bwx machine, normal resourceN files. */
	nlen1 = 10;

	if (pdev->resource[num].flags & IORESOURCE_MEM) {
		sparse_base = hose->sparse_mem_base;
		dense_base = hose->dense_mem_base;
		if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) {
			sparse_base = 0;
			suffix = "_dense";
			nlen1 = 16;	/* resourceN_dense */
		}
	} else {
		sparse_base = hose->sparse_io_base;
		dense_base = hose->dense_io_base;
	}

	if (sparse_base) {
		suffix = "_sparse";
		nlen1 = 17;
		if (dense_base) {
			nlen2 = 16;	/* resourceN_dense */
			res_count = 2;
		}
	}

	attr = kzalloc(sizeof(*attr) * res_count + nlen1 + nlen2, GFP_ATOMIC);
	if (!attr)
		return -ENOMEM;

	/* Create bwx, sparse or single dense file */
	attr_name = (char *)(attr + res_count);
	pdev->res_attr[num] = attr;
	retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr,
				     sparse_base);
	if (retval || res_count == 1)
		return retval;

	/* Create dense file */
	attr_name += nlen1;
	attr++;
	pdev->res_attr_wc[num] = attr;
	return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0);
}