static void populate_properties()

in fdt.c [109:204]

• 72 lines of code
• 16 McCabe index (conditional complexity)

static void populate_properties(const void *blob,
				int offset,
				void **mem,
				struct device_node *np,
				const char *nodename,
				bool dryrun)
{
	struct property *pp, **pprev = NULL;
	int cur;
	bool has_name = false;

	pprev = &np->properties;
	for (cur = fdt_first_property_offset(blob, offset);
	     cur >= 0;
	     cur = fdt_next_property_offset(blob, cur)) {
		const __be32 *val;
		const char *pname;
		u32 sz;

		val = fdt_getprop_by_offset(blob, cur, &pname, &sz);
		if (!val) {
			pr_warn("Cannot locate property at 0x%x\n", cur);
			continue;
		}

		if (!pname) {
			pr_warn("Cannot find property name at 0x%x\n", cur);
			continue;
		}

		if (!strcmp(pname, "name"))
			has_name = true;

		pp = unflatten_dt_alloc(mem, sizeof(struct property),
					__alignof__(struct property));
		if (dryrun)
			continue;

		/* We accept flattened tree phandles either in
		 * ePAPR-style "phandle" properties, or the
		 * legacy "linux,phandle" properties.  If both
		 * appear and have different values, things
		 * will get weird. Don't do that.
		 */
		if (!strcmp(pname, "phandle") ||
		    !strcmp(pname, "linux,phandle")) {
			if (!np->phandle)
				np->phandle = be32_to_cpup(val);
		}

		/* And we process the "ibm,phandle" property
		 * used in pSeries dynamic device tree
		 * stuff
		 */
		if (!strcmp(pname, "ibm,phandle"))
			np->phandle = be32_to_cpup(val);

		pp->name   = (char *)pname;
		pp->length = sz;
		pp->value  = (__be32 *)val;
		*pprev     = pp;
		pprev      = &pp->next;
	}

	/* With version 0x10 we may not have the name property,
	 * recreate it here from the unit name if absent
	 */
	if (!has_name) {
		const char *p = nodename, *ps = p, *pa = NULL;
		int len;

		while (*p) {
			if ((*p) == '@')
				pa = p;
			else if ((*p) == '/')
				ps = p + 1;
			p++;
		}

		if (pa < ps)
			pa = p;
		len = (pa - ps) + 1;
		pp = unflatten_dt_alloc(mem, sizeof(struct property) + len,
					__alignof__(struct property));
		if (!dryrun) {
			pp->name   = "name";
			pp->length = len;
			pp->value  = pp + 1;
			*pprev     = pp;
			memcpy(pp->value, ps, len - 1);
			((char *)pp->value)[len - 1] = 0;
			pr_debug("fixed up name for %s -> %s\n",
				 nodename, (char *)pp->value);
		}
	}
}