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<?php
/**
* Skip Registration for Logged In Users
* http://gravitywiz.com/2012/04/24/skip-user-registration-for-logged-in-users/
* Works for GF User Registration versions before 3.0. For version 3.0 and greater, use this alternate snippet:
* https://gist.github.com/spivurno/a9d80f6afb5cd46cf8c2
*/
add_action('gform_post_submission', 'maybe_skip_registration', 9);
add_action('gform_after_submission', 'maybe_skip_registration', 9);
function maybe_skip_registration($entry) {
    
    if(is_user_logged_in()) {
        remove_action('gform_post_submission', array('GFUser', 'gf_create_user'));
        remove_action('gform_after_submission', array('GFUser', 'gf_create_user'));
    }
    
}

add_filter('gform_validation', 'maybe_skip_validation', 9);
function maybe_skip_validation($validation_result) {
    if(is_user_logged_in()) {
        remove_filter('gform_validation', array('GFUser', 'user_registration_validation'));
    }
    return $validation_result;
}