use mutex as field instead of embedded (#3480)

pkg/webhooks/generation.go

@@ -207,10 +207,10 @@ func (ws *WebhookServer) updateAnnotationInGR(gr *kyverno.GenerateRequest, logge
 	if len(grAnnotations) == 0 {
 		grAnnotations = make(map[string]string)
 	}
-	ws.Lock()
+	ws.mu.Lock()
 	grAnnotations["generate.kyverno.io/updation-time"] = time.Now().String()
 	gr.SetAnnotations(grAnnotations)
-	ws.Unlock()
+	ws.mu.Unlock()
 	_, err := ws.kyvernoClient.KyvernoV1().GenerateRequests(config.KyvernoNamespace).Update(contextdefault.TODO(), gr, metav1.UpdateOptions{})
 	if err != nil {
 		logger.Error(err, "failed to update generate request for the resource", "generate request", gr.Name)

pkg/webhooks/server.go

@@ -126,7 +126,7 @@ type WebhookServer struct {
 
 	promConfig *metrics.PromConfig
 
-	sync.RWMutex
+	mu sync.RWMutex
 }
 
 // NewWebhookServer creates new instance of WebhookServer accordingly to given configuration