[PATCH] rt2x00: Fix panic on rmmod with rfkill enabled

When ieee80211_hw.config indicates that the radio
is enabled and is configuring options that require
the link tuner to be restarted the link tuner will
cause a kernel panic when rfkill has indicated the
radio was in fact disabled.
Signed-off-by: Modestas Vainius <modestas@vainius.eu>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -85,6 +85,9 @@ static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
 
 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
 {
+	if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
+		return;
+
 	rt2x00lib_stop_link_tuner(rt2x00dev);
 	rt2x00lib_start_link_tuner(rt2x00dev);
 }