Angularjs ui-router. How to redirect to login page

The point is, do not redirect if not needed === if already redirected to intended state. There is a working plunker with similar solution

.run(function($rootScope, $location, $state, authenticationSvc) {


    $rootScope.$on( '$stateChangeStart', function(e, toState  , toParams
                                                   , fromState, fromParams) {

        var isLogin = toState.name === "login";
        if(isLogin){
           return; // no need to redirect 
        }

        // now, redirect only not authenticated

        var userInfo = authenticationSvc.getUserInfo();

        if(userInfo.authenticated === false) {
            e.preventDefault(); // stop current execution
            $state.go('login'); // go to login
        }
    });
});

Check these for similar explanation:

• Angular ui router – Redirection doesn’t work at all
• How can I fix ‘Maximum call stack size exceeded’ AngularJS