int ntb_msi_init()

in msi.c [31:80]

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

int ntb_msi_init(struct ntb_dev *ntb,
		 void (*desc_changed)(void *ctx))
{
	phys_addr_t mw_phys_addr;
	resource_size_t mw_size;
	size_t struct_size;
	int peer_widx;
	int peers;
	int ret;
	int i;

	peers = ntb_peer_port_count(ntb);
	if (peers <= 0)
		return -EINVAL;

	struct_size = sizeof(*ntb->msi) + sizeof(*ntb->msi->peer_mws) * peers;

	ntb->msi = devm_kzalloc(&ntb->dev, struct_size, GFP_KERNEL);
	if (!ntb->msi)
		return -ENOMEM;

	ntb->msi->desc_changed = desc_changed;

	for (i = 0; i < peers; i++) {
		peer_widx = ntb_peer_mw_count(ntb) - 1 - i;

		ret = ntb_peer_mw_get_addr(ntb, peer_widx, &mw_phys_addr,
					   &mw_size);
		if (ret)
			goto unroll;

		ntb->msi->peer_mws[i] = devm_ioremap(&ntb->dev, mw_phys_addr,
						     mw_size);
		if (!ntb->msi->peer_mws[i]) {
			ret = -EFAULT;
			goto unroll;
		}
	}

	return 0;

unroll:
	for (i = 0; i < peers; i++)
		if (ntb->msi->peer_mws[i])
			devm_iounmap(&ntb->dev, ntb->msi->peer_mws[i]);

	devm_kfree(&ntb->dev, ntb->msi);
	ntb->msi = NULL;
	return ret;
}