int chameleon_parse_cells()

in mcb-parse.c [177:255]

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

int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
			void __iomem *base)
{
	struct chameleon_fpga_header *header;
	struct chameleon_bar *cb;
	char __iomem *p = base;
	int num_cells = 0;
	uint32_t dtype;
	int bar_count;
	int ret;
	u32 hsize;

	hsize = sizeof(struct chameleon_fpga_header);

	header = kzalloc(hsize, GFP_KERNEL);
	if (!header)
		return -ENOMEM;

	/* Extract header information */
	memcpy_fromio(header, p, hsize);
	/* We only support chameleon v2 at the moment */
	header->magic = le16_to_cpu(header->magic);
	if (header->magic != CHAMELEONV2_MAGIC) {
		pr_err("Unsupported chameleon version 0x%x\n",
				header->magic);
		ret = -ENODEV;
		goto free_header;
	}
	p += hsize;

	bus->revision = header->revision;
	bus->model = header->model;
	bus->minor = header->minor;
	snprintf(bus->name, CHAMELEON_FILENAME_LEN + 1, "%s",
		 header->filename);

	bar_count = chameleon_get_bar(&p, mapbase, &cb);
	if (bar_count < 0) {
		ret = bar_count;
		goto free_header;
	}

	for_each_chameleon_cell(dtype, p) {
		switch (dtype) {
		case CHAMELEON_DTYPE_GENERAL:
			ret = chameleon_parse_gdd(bus, cb, p, bar_count);
			if (ret < 0)
				goto free_bar;
			p += sizeof(struct chameleon_gdd);
			break;
		case CHAMELEON_DTYPE_BRIDGE:
			chameleon_parse_bdd(bus, cb, p);
			p += sizeof(struct chameleon_bdd);
			break;
		case CHAMELEON_DTYPE_END:
			break;
		default:
			pr_err("Invalid chameleon descriptor type 0x%x\n",
				dtype);
			ret = -EINVAL;
			goto free_bar;
		}
		num_cells++;
	}

	if (num_cells == 0)
		num_cells = -EINVAL;

	kfree(cb);
	kfree(header);
	return num_cells;

free_bar:
	kfree(cb);
free_header:
	kfree(header);

	return ret;
}