Function dt_find_compat

util/cbmem/devmem_drv.c:282–351

}

static char *dt_find_compat(const char *parent, const char *compat, int *addr_cells_ptr,
			    int *size_cells_ptr)
{
	char *ret = NULL;
	struct dirent *entry;
	DIR *dir;

	if (!(dir = opendir(parent))) {
		perror(parent);
		return NULL;
	}

	/* Loop through all files in the directory (DT node). */
	while ((entry = readdir(dir))) {
		/* We only care about compatible props or subnodes. */
		if (entry->d_name[0] == '.' ||
		    !((entry->d_type & DT_DIR) || !strcmp(entry->d_name, "compatible")))
			continue;

		/* Assemble the file name (on the stack, for speed). */
		size_t plen = strlen(parent);
		char *name = alloca(plen + strlen(entry->d_name) + 2);

		strcpy(name, parent);
		name[plen] = '/';
		strcpy(name + plen + 1, entry->d_name);

		/* If it's a subnode, recurse. */
		if (entry->d_type & DT_DIR) {
			ret = dt_find_compat(name, compat, addr_cells_ptr, size_cells_ptr);

			/* There is only one matching node to find, abort. */
			if (ret) {
				/* Gather cells values on the way up. */
				dt_update_cells(parent, addr_cells_ptr, size_cells_ptr);
				break;
			}
			continue;
		}

		/* If it's a compatible string, see if it's the right one. */
		int fd = open(name, O_RDONLY);
		int clen = strlen(compat);
		char *buffer = alloca(clen + 1);

		if (fd < 0) {
			perror(name);
			continue;
		}

		if (read(fd, buffer, clen + 1) < 0) {
			perror(name);
			close(fd);
			continue;
		}
		close(fd);

		if (!strcmp(compat, buffer)) {