int __init early_init_dt_scan_chosen()

in fdt.c [1143:1199]

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

int __init early_init_dt_scan_chosen(char *cmdline)
{
	int l, node;
	const char *p;
	const void *rng_seed;
	const void *fdt = initial_boot_params;

	node = fdt_path_offset(fdt, "/chosen");
	if (node < 0)
		node = fdt_path_offset(fdt, "/chosen@0");
	if (node < 0)
		return -ENOENT;

	chosen_node_offset = node;

	early_init_dt_check_for_initrd(node);
	early_init_dt_check_for_elfcorehdr(node);

	/* Retrieve command line */
	p = of_get_flat_dt_prop(node, "bootargs", &l);
	if (p != NULL && l > 0)
		strlcpy(cmdline, p, min(l, COMMAND_LINE_SIZE));

	/*
	 * CONFIG_CMDLINE is meant to be a default in case nothing else
	 * managed to set the command line, unless CONFIG_CMDLINE_FORCE
	 * is set in which case we override whatever was found earlier.
	 */
#ifdef CONFIG_CMDLINE
#if defined(CONFIG_CMDLINE_EXTEND)
	strlcat(cmdline, " ", COMMAND_LINE_SIZE);
	strlcat(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
#elif defined(CONFIG_CMDLINE_FORCE)
	strlcpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
#else
	/* No arguments from boot loader, use kernel's  cmdl*/
	if (!((char *)cmdline)[0])
		strlcpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
#endif
#endif /* CONFIG_CMDLINE */

	pr_debug("Command line is: %s\n", (char *)cmdline);

	rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l);
	if (rng_seed && l > 0) {
		add_bootloader_randomness(rng_seed, l);

		/* try to clear seed so it won't be found. */
		fdt_nop_property(initial_boot_params, node, "rng-seed");

		/* update CRC check value */
		of_fdt_crc32 = crc32_be(~0, initial_boot_params,
				fdt_totalsize(initial_boot_params));
	}

	return 0;
}