[PATCH 05/11] rt2x00: Don't kill guardian_urb when it wasn't created

[Ivo van Doorn <ivdoorn@gmail.com>]

This fixes a "BUG: unable to handle kernel paging request"
bug in rt73usb which was caused by killing the guardian_urb
while it had never been allocated for rt73usb.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
---
 drivers/net/wireless/rt2x00/rt2x00usb.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index 52d12fd..36a087a 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -394,8 +394,11 @@ void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 	}
 
 	/*
-	 * Kill guardian urb.
+	 * Kill guardian urb (if required by driver).
 	 */
+	if (!test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
+		return;
+
 	for (i = 0; i < rt2x00dev->bcn->limit; i++) {
 		bcn_priv = rt2x00dev->bcn->entries[i].priv_data;
 		if (bcn_priv->guardian_urb)
-- 
1.5.5.3