From: Wolfram Sang <wsa@the-dreams.de>
Date: Sun, 12 Jan 2014 09:07:50 +0000 (+0100)
Subject: usb: core: bail out if user gives an unknown RefId when using new_id
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=52a6966c;p=linux-beck.git

usb: core: bail out if user gives an unknown RefId when using new_id

If users use the new RefId feature of new_id, give them an error message
if they provided an unknown reference. That helps detecting typos.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 9b29e5c94be7..620a0baf103e 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -74,10 +74,13 @@ ssize_t usb_store_new_id(struct usb_dynids *dynids,
 		const struct usb_device_id *id = id_table;
 
 		for (; id->match_flags; id++)
-			if (id->idVendor == refVendor && id->idProduct == refProduct) {
-				dynid->id.driver_info = id->driver_info;
+			if (id->idVendor == refVendor && id->idProduct == refProduct)
 				break;
-			}
+
+		if (id->match_flags)
+			dynid->id.driver_info = id->driver_info;
+		else
+			return -ENODEV;
 	}
 
 	spin_lock(&dynids->lock);