mac80211: split RX_DROP

Some instances of RX_DROP mean that the frame was useless,
others mean that the frame should be visible in userspace
on "cooked" monitor interfaces. This patch splits up RX_DROP
and changes each instance appropriately.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 36ea4fb..31fc64c5 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -114,9 +114,10 @@
 #define TX_QUEUED	((__force ieee80211_tx_result) 2u)
 
 typedef unsigned __bitwise__ ieee80211_rx_result;
-#define RX_CONTINUE	((__force ieee80211_rx_result) 0u)
-#define RX_DROP		((__force ieee80211_rx_result) 1u)
-#define RX_QUEUED	((__force ieee80211_rx_result) 2u)
+#define RX_CONTINUE		((__force ieee80211_rx_result) 0u)
+#define RX_DROP_UNUSABLE	((__force ieee80211_rx_result) 1u)
+#define RX_DROP_MONITOR		((__force ieee80211_rx_result) 2u)
+#define RX_QUEUED		((__force ieee80211_rx_result) 3u)
 
 
 /* flags used in struct ieee80211_txrx_data.flags */