--- zzzz-none-000/linux-2.4.17/drivers/usb/usb.c	2001-11-21 17:59:11.000000000 +0000
+++ sangam-fb-401/linux-2.4.17/drivers/usb/usb.c	2005-03-30 14:18:05.000000000 +0000
@@ -68,6 +68,22 @@
 
 static struct usb_driver *usb_minors[16];
 
+#define CONFIG_USB_HOST_LIMIT_DEVICES
+#define CONFIG_USB_HOST_MAX_DEVICES	5	/* = Root hub, hub + three devices... */
+
+#if defined(CONFIG_USB_HOST_LIMIT_DEVICES)
+# if !defined(CONFIG_USB_HOST_MAX_DEVICES)
+#  error CONFIG_USB_HOST_MAX_DEVICES not #defined!
+# elif CONFIG_USB_HOST_MAX_DEVICES < 1
+#  define CONFIG_USB_HOST_MAX_DEVICES 1
+# endif
+/*
+ * Assumption: 1 host controller hardware, 1 host controller driver. This 
+ * variable needs to be moved into some hcd private structure, otherwise.
+ */
+static unsigned int	ndev_allow = CONFIG_USB_HOST_MAX_DEVICES;
+#endif
+
 /**
  *	usb_register - register a USB driver
  *	@new_driver: USB operations for the driver
@@ -1729,6 +1745,9 @@
 	if (dev->devnum > 0) {
 		clear_bit(dev->devnum, &dev->bus->devmap.devicemap);
 		usbdevfs_remove_device(dev);
+#if defined(CONFIG_USB_HOST_LIMIT_DEVICES)
+		++ndev_allow;
+#endif
 	}
 
 	/* Free up the device itself */
@@ -2185,7 +2204,11 @@
 	dev->epmaxpacketin [0] = 8;
 	dev->epmaxpacketout[0] = 8;
 
+#if defined(CONFIG_USB_HOST_LIMIT_DEVICES)
+	err = (ndev_allow > 0) ? usb_set_address(dev) : -EREMDEV;	/* Error 142 */
+#else
 	err = usb_set_address(dev);
+#endif
 	if (err < 0) {
 		err("USB device not accepting new address=%d (error=%d)",
 			dev->devnum, err);
@@ -2240,6 +2263,9 @@
 		dev->devnum = -1;
 		return 1;
 	}
+#if defined(CONFIG_USB_HOST_LIMIT_DEVICES)
+	--ndev_allow;
+#endif
 
 	dbg("new device strings: Mfr=%d, Product=%d, SerialNumber=%d",
 		dev->descriptor.iManufacturer, dev->descriptor.iProduct, dev->descriptor.iSerialNumber);