diff --git a/hw/usb-ehci.c b/hw/usb-ehci.c
index 27376a2..bd374c1 100644
--- a/hw/usb-ehci.c
+++ b/hw/usb-ehci.c
@@ -880,6 +880,7 @@
         }
         if (devs[i] && devs[i]->attached) {
             usb_attach(&s->ports[i]);
+            usb_send_msg(devs[i], USB_MSG_RESET);
         }
     }
     ehci_queues_rip_all(s);
@@ -978,8 +979,7 @@
     if (!(val & PORTSC_PRESET) &&(*portsc & PORTSC_PRESET)) {
         trace_usb_ehci_port_reset(port, 0);
         if (dev && dev->attached) {
-            usb_attach(&s->ports[port]);
-            usb_send_msg(dev, USB_MSG_RESET);
+            usb_reset(&s->ports[port]);
             *portsc &= ~PORTSC_CSC;
         }
 
diff --git a/hw/usb-ohci.c b/hw/usb-ohci.c
index c3be65a..5e10e21 100644
--- a/hw/usb-ohci.c
+++ b/hw/usb-ohci.c
@@ -449,7 +449,7 @@
         port = &ohci->rhport[i];
         port->ctrl = 0;
         if (port->port.dev && port->port.dev->attached) {
-            usb_attach(&port->port);
+            usb_reset(&port->port);
         }
       }
     if (ohci->async_td) {
diff --git a/hw/usb-uhci.c b/hw/usb-uhci.c
index 17992cf..171d787 100644
--- a/hw/usb-uhci.c
+++ b/hw/usb-uhci.c
@@ -341,7 +341,7 @@
         port = &s->ports[i];
         port->ctrl = 0x0080;
         if (port->port.dev && port->port.dev->attached) {
-            usb_attach(&port->port);
+            usb_reset(&port->port);
         }
     }
 
diff --git a/hw/usb.c b/hw/usb.c
index fa90204..2216efe 100644
--- a/hw/usb.c
+++ b/hw/usb.c
@@ -33,6 +33,7 @@
 
     assert(dev != NULL);
     assert(dev->attached);
+    assert(dev->state == USB_STATE_NOTATTACHED);
     port->ops->attach(port);
     usb_send_msg(dev, USB_MSG_ATTACH);
 }
@@ -42,10 +43,21 @@
     USBDevice *dev = port->dev;
 
     assert(dev != NULL);
+    assert(dev->state != USB_STATE_NOTATTACHED);
     port->ops->detach(port);
     usb_send_msg(dev, USB_MSG_DETACH);
 }
 
+void usb_reset(USBPort *port)
+{
+    USBDevice *dev = port->dev;
+
+    assert(dev != NULL);
+    usb_detach(port);
+    usb_attach(port);
+    usb_send_msg(dev, USB_MSG_RESET);
+}
+
 void usb_wakeup(USBDevice *dev)
 {
     if (dev->remote_wakeup && dev->port && dev->port->ops->wakeup) {
diff --git a/hw/usb.h b/hw/usb.h
index c08d469..c6e1870 100644
--- a/hw/usb.h
+++ b/hw/usb.h
@@ -306,6 +306,7 @@
 
 void usb_attach(USBPort *port);
 void usb_detach(USBPort *port);
+void usb_reset(USBPort *port);
 void usb_wakeup(USBDevice *dev);
 int usb_generic_handle_packet(USBDevice *s, USBPacket *p);
 void usb_generic_async_ctrl_complete(USBDevice *s, USBPacket *p);