@@ -1,6 +1,10 @@

 package authorization

-import "github.com/docker/docker/pkg/plugins"

+import (

+	"sync"

+

+	"github.com/docker/docker/pkg/plugins"

+)

 // Plugin allows third party plugins to authorize requests and responses

 // in the context of docker API

@@ -33,6 +37,7 @@ func NewPlugins(names []string) []Plugin {

 type authorizationPlugin struct {

 	plugin *plugins.Plugin

 	name   string

+	once   sync.Once

 }

 func newAuthorizationPlugin(name string) Plugin {

@@ -72,12 +77,11 @@ func (a *authorizationPlugin) AuthZResponse(authReq *Request) (*Response, error)

 // initPlugin initializes the authorization plugin if needed

 func (a *authorizationPlugin) initPlugin() error {

 	// Lazy loading of plugins

-	if a.plugin == nil {

-		var err error

-		a.plugin, err = plugins.Get(a.name, AuthZApiImplements)

-		if err != nil {

-			return err

+	var err error

+	a.once.Do(func() {

+		if a.plugin == nil {

+			a.plugin, err = plugins.Get(a.name, AuthZApiImplements)

 		}

-	}

-	return nil

+	})

+	return err

 }