ar9170usb: mark the old driver as obsolete

AR9170USB will be replaced by carl9170 in the foreseeable
future [2.6.40].
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

Documentation/feature-removal-schedule.txt

@@ -35,6 +35,17 @@ Who:	Luis R. Rodriguez <lrodriguez@atheros.com>
 
 ---------------------------
 
+What:	AR9170USB
+When:	2.6.40
+
+Why:	This driver is deprecated and the firmware is no longer
+	maintained. The replacement driver "carl9170" has been
+	around for a while, so the devices are still supported.
+
+Who:	Christian Lamparter <chunkeey@googlemail.com>
+
+---------------------------
+
 What:	IRQF_SAMPLE_RANDOM
 Check:	IRQF_SAMPLE_RANDOM
 When:	July 2009

MAINTAINERS

@@ -1199,7 +1199,7 @@ ATHEROS AR9170 WIRELESS DRIVER
 M:	Christian Lamparter <chunkeey@web.de>
 L:	linux-wireless@vger.kernel.org
 W:	http://wireless.kernel.org/en/users/Drivers/ar9170
-S:	Maintained
+S:	Obsolete
 F:	drivers/net/wireless/ath/ar9170/
 
 CARL9170 LINUX COMMUNITY WIRELESS DRIVER

drivers/net/wireless/ath/ar9170/Kconfig

 config AR9170_USB
-	tristate "Atheros AR9170 802.11n USB support"
+	tristate "Atheros AR9170 802.11n USB support (OBSOLETE)"
 	depends on USB && MAC80211
 	select FW_LOADER
 	help
+	  This driver is going to get replaced by carl9170.
+
 	  This is a driver for the Atheros "otus" 802.11n USB devices.
 
 	  These devices require additional firmware (2 files).