diff -urN linux_orig/drivers/net/usb/plusb.c linux_new/drivers/net/usb/plusb.c
--- linux_orig/drivers/net/usb/plusb.c	2010-09-12 17:07:08.377086065 +0200
+++ linux_new/drivers/net/usb/plusb.c	2010-09-12 17:10:06.088880446 +0200
@@ -1,5 +1,5 @@
 /*
- * PL-2301/2302 USB host-to-host link cables
+ * PL-2301/2302/2501 USB host-to-host link cables
  * Copyright (C) 2000-2005 by David Brownell
  *
  * This program is free software; you can redistribute it and/or modify
@@ -32,7 +32,7 @@
 
 
 /*
- * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com
+ * Prolific PL-2301/2302/2501 driver ... http://www.prolifictech.com
  *
  * The protocol and handshaking used here should be bug-compatible
  * with the Linux 2.2 "plusb" driver, by Deti Fliegl.
@@ -95,7 +95,7 @@
 }
 
 static const struct driver_info	prolific_info = {
-	.description =	"Prolific PL-2301/PL-2302",
+	.description =	"Prolific PL-2301/2302/2501",
 	.flags =	FLAG_NO_SETINT,
 		/* some PL-2302 versions seem to fail usb_set_interface() */
 	.reset =	pl_reset,
@@ -117,6 +117,9 @@
 }, {
 	USB_DEVICE(0x067b, 0x0001),	// PL-2302
 	.driver_info =	(unsigned long) &prolific_info,
+}, {
+	USB_DEVICE(0x067b, 0x2501),	// PL-2501
+	.driver_info =	(unsigned long) &prolific_info,
 },
 
 	{ },		// END
@@ -145,5 +148,5 @@
 module_exit(plusb_exit);
 
 MODULE_AUTHOR("David Brownell");
-MODULE_DESCRIPTION("Prolific PL-2301/2302 USB Host to Host Link Driver");
+MODULE_DESCRIPTION("Prolific PL-2301/2302/2501 USB Host to Host Link Driver");
 MODULE_LICENSE("GPL");