CPT dropdown meta in another CPT

cpt-dropdown.php

<?php

add_action( 'cmb_render_location_list', 'dss_cmb_render_location_list', 10, 2 );
function dss_cmb_render_location_list( $field, $meta ) {
  global $post;
	$tmp_post = $post;
	// set the args
	$args = array (
		'post_type'			=> 'locations',
		'posts_per_page'	=> -1,
		'orderby'			=> 'title',
		'order'				=> 'ASC' );

	// call the query
	$myposts = get_posts( $args );

	echo '<select name="', $field['id'], '" id="', $field['id'], '">';
	echo '<option value="">Please Select</option>';

	foreach( $myposts as $post ) :	setup_postdata($post);
		echo '<option value="', $post->ID, '"', $meta == $post->ID ? ' selected="selected"' : '', '>', $post->post_title, '</option>';
	endforeach;
	
	echo '</select>';
	$post = $tmp_post;
	
}