How to disable comments in attachment media

Solution to disable comments in attachment media in twenty twelve theme

Paste the following code in your theme’s functions.php file

function filter_media_comment_status( $open, $post_id ) {
        $post = get_post( $post_id );
        if( $post->post_type == 'attachment' ) {
                return false;
        }
        return $open;
}
add_filter( 'comments_open', 'filter_media_comment_status', 10 , 2 );