diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 8ae4c6c..61cc887 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -157,23 +157,41 @@ struct pl2303_private {
 static int pl2303_vendor_read(__u16 value, __u16 index,
 		struct usb_serial *serial, unsigned char *buf)
 {
+	struct device *dev = &serial->interface->dev;
 	int res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 			VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
 			value, index, buf, 1, 100);
+	if (res != 1) {
+		dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
+								value, res);
+		if (res >= 0)
+			res = -EIO;
+
+		return res;
+	}			
 	dbg("0x%x:0x%x:0x%x:0x%x  %d - %x", VENDOR_READ_REQUEST_TYPE,
 			VENDOR_READ_REQUEST, value, index, res, buf[0]);
-	return res;
+	return 0;
 }
 
 static int pl2303_vendor_write(__u16 value, __u16 index,
 		struct usb_serial *serial)
 {
+	struct device *dev = &serial->interface->dev;
+	
+	
 	int res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 			VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
 			value, index, NULL, 0, 100);
+	if (res) {
+		dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
+								value, res);
+		return res;
+	}
+			
 	dbg("0x%x:0x%x:0x%x:0x%x  %d", VENDOR_WRITE_REQUEST_TYPE,
 			VENDOR_WRITE_REQUEST, value, index, res);
-	return res;
+	return 0;
 }
 
 static int pl2303_startup(struct usb_serial *serial)
@@ -837,6 +855,7 @@ static int __init pl2303_init(void)
 	if (retval)
 		goto failed_usb_register;
 	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
+	printk(KERN_INFO KBUILD_MODNAME ": TI MUSB debugging version\n");
 	return 0;
 failed_usb_register:
 	usb_serial_deregister(&pl2303_device);