mac80211: fix tx queue allocation for active monitor interfaces

Fixes a crash with drivers like ath9k

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/kernel/mac80211/patches/394-mac80211-allocate-TXQs-for-active-monitor-interfaces.patch

@@ -0,0 +1,26 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Sat, 22 Sep 2018 15:05:59 +0200
+Subject: [PATCH] mac80211: allocate TXQs for active monitor interfaces
+
+Monitor mode interfaces with the active flag are passed down to the driver.
+Drivers using TXQ expect that all interfaces have allocated TXQs before
+they get added.
+
+Fixes: 79af1f866193d ("mac80211: avoid allocating TXQs that won't be used")
+Cc: stable@vger.kernel.org
+Reported-by: Catrinel Catrinescu <cc@80211.de>
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/net/mac80211/iface.c
++++ b/net/mac80211/iface.c
+@@ -1816,7 +1816,8 @@ int ieee80211_if_add(struct ieee80211_lo
+ 
+ 		if (local->ops->wake_tx_queue &&
+ 		    type != NL80211_IFTYPE_AP_VLAN &&
+-		    type != NL80211_IFTYPE_MONITOR)
++		    (type != NL80211_IFTYPE_MONITOR ||
++		     (params->flags & MONITOR_FLAG_ACTIVE)))
+ 			txq_size += sizeof(struct txq_info) +
+ 				    local->hw.txq_data_size;
+