diff --git a/commands/usb.c b/commands/usb.c
index e503065..9aee430 100644
--- a/commands/usb.c
+++ b/commands/usb.c
@@ -22,24 +22,20 @@
 #include <usb/usb.h>
 #include <getopt.h>
 
-static int scanned;
-
 static int do_usb(int argc, char *argv[])
 {
 	int opt;
+	int force = 0;
 
 	while ((opt = getopt(argc, argv, "f")) > 0) {
 		switch (opt) {
 		case 'f':
-			scanned = 0;
+			force = 1;
 			break;
 		}
 	}
 
-	if (!scanned) {
-		usb_rescan();
-		scanned = 1;
-	}
+	usb_rescan(force);
 
 	return 0;
 }
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 9a0723a..36fc736 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -431,14 +431,22 @@
 	if (dev->descriptor->iSerialNumber)
 		usb_string(dev, dev->descriptor->iSerialNumber,
 			   dev->serial, sizeof(dev->serial));
+
+	if (parent) {
+		sprintf(dev->dev.name, "%s-%d", parent->dev.name, port);
+	} else {
+		sprintf(dev->dev.name, "usb%d", dev->host->busnum);
+	}
+
+	dev->dev.id = DEVICE_ID_SINGLE;
+
+	register_device(&dev->dev);
+
 	/* now prode if the device is a hub */
 	usb_hub_probe(dev, 0);
 
-	sprintf(dev->dev.name, "usb%d-%d", dev->host->busnum, dev->devnum);
-
 	print_usb_device(dev);
 
-	register_device(&dev->dev);
 	dev_add_param_int_ro(&dev->dev, "iManufacturer",
 			dev->descriptor->iManufacturer, "%d");
 	dev_add_param_int_ro(&dev->dev, "iProduct",
@@ -480,13 +488,18 @@
 	return usbdev;
 }
 
-void usb_rescan(void)
+int usb_host_detect(struct usb_host *host, int force)
 {
 	struct usb_device *dev, *tmp;
-	struct usb_host *host;
 	int ret;
 
+	if (host->scanned && !force)
+		return -EBUSY;
+
 	list_for_each_entry_safe(dev, tmp, &usb_device_list, list) {
+		if (dev->host != host)
+			continue;
+
 		list_del(&dev->list);
 		unregister_device(&dev->dev);
 		if (dev->hub)
@@ -496,17 +509,31 @@
 		free(dev);
 	}
 
+	ret = host->init(host);
+	if (ret)
+		return ret;
+
+	dev = usb_alloc_new_device();
+	dev->host = host;
+	usb_new_device(dev);
+
+	host->scanned = 1;
+
+	return 0;
+}
+
+void usb_rescan(int force)
+{
+	struct usb_host *host;
+	int ret;
+
 	printf("USB: scanning bus for devices...\n");
 	dev_index = 0;
 
 	list_for_each_entry(host, &host_list, list) {
-		ret = host->init(host);
+		ret = usb_host_detect(host, force);
 		if (ret)
 			continue;
-
-		dev = usb_alloc_new_device();
-		dev->host = host;
-		usb_new_device(dev);
 	}
 
 	printf("%d USB Device(s) found\n", dev_index);
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 7297e48..f44f836 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -850,6 +850,13 @@
 	return -1;
 }
 
+static int ehci_detect(struct device_d *dev)
+{
+	struct ehci_priv *ehci = dev->priv;
+
+	return usb_host_detect(&ehci->host, 0);
+}
+
 int ehci_register(struct device_d *dev, struct ehci_data *data)
 {
 	struct usb_host *host;
@@ -885,6 +892,8 @@
 		ehci_reset(ehci);
 	}
 
+	dev->detect = ehci_detect;
+
 	usb_register_host(host);
 
 	reg = HC_VERSION(ehci_readl(&ehci->hccr->cr_capbase));
diff --git a/include/usb/usb.h b/include/usb/usb.h
index da0090e..95fb6f3 100644
--- a/include/usb/usb.h
+++ b/include/usb/usb.h
@@ -211,10 +211,13 @@
 	struct list_head list;
 
 	int busnum;
+	int scanned;
 };
 
 int usb_register_host(struct usb_host *);
 
+int usb_host_detect(struct usb_host *host, int force);
+
 /* Defines */
 #define USB_UHCI_VEND_ID	0x8086
 #define USB_UHCI_DEV_ID		0x7112
@@ -248,7 +251,7 @@
 int usb_string(struct usb_device *dev, int index, char *buf, size_t size);
 int usb_set_interface(struct usb_device *dev, int interface, int alternate);
 
-void usb_rescan(void);
+void usb_rescan(int force);
 
 /* big endian -> little endian conversion */
 /* some CPUs are already little endian e.g. the ARM920T */