ath9k: channel context based transmission

Force queueing of all frames that belong to a virtual interface on
a different channel context, to ensure that they are sent on the
correct channel.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 8f59cea..ddd2e81 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -275,8 +275,9 @@
 struct ath_tx_control {
 	struct ath_txq *txq;
 	struct ath_node *an;
-	u8 paprd;
 	struct ieee80211_sta *sta;
+	u8 paprd;
+	bool force_channel;
 };