add mutex for ep0 urb to avoid multithreading

class/hub/usbh_hub.c

@@ -310,6 +310,7 @@ static void usbh_hubport_release(struct usbh_hubport *child)
         }
         child->config.config_desc.bNumInterfaces = 0;
         usbh_kill_urb(&child->ep0_urb);
+        usb_osal_mutex_delete(child->mutex);
     }
 }
 
@@ -598,6 +599,7 @@ static void usbh_hub_events(struct usbh_hub *hub)
                     child->connected = true;
                     child->port = port + 1;
                     child->speed = speed;
+                    child->mutex = usb_osal_mutex_create();
 
                     USB_LOG_INFO("New %s device on Hub %u, Port %u connected\r\n", speed_table[speed], hub->index, port + 1);
 

core/usbh_core.c

@@ -673,11 +673,16 @@ int usbh_control_transfer(struct usbh_hubport *hport, struct usb_setup_packet *s
 
     urb = &hport->ep0_urb;
 
+    usb_osal_mutex_take(hport->mutex);
+
+    memset(urb, 0, sizeof(struct usbh_urb));
     usbh_control_urb_fill(urb, hport, setup, buffer, setup->wLength, CONFIG_USBHOST_CONTROL_TRANSFER_TIMEOUT, NULL, NULL);
     ret = usbh_submit_urb(urb);
     if (ret == 0) {
         ret = urb->actual_length;
     }
+
+    usb_osal_mutex_give(hport->mutex);
     return ret;
 }
 

core/usbh_core.h

@@ -111,6 +111,7 @@ struct usbh_hubport {
 #endif
     struct usb_endpoint_descriptor ep0;
     struct usbh_urb ep0_urb;
+    usb_osal_mutex_t mutex;
 };
 
 struct usbh_hub {