From 7b8a9cdd1f959c7166611fcc58ac91e8409c10ab Mon Sep 17 00:00:00 2001
From: Ido Yariv <ido@wizery.com>
Date: Mon, 24 Mar 2014 09:55:45 +0200
Subject: mac80211: Disable SMPS for the monitor interface

All antennas should be operational when monitoring to maximize
reception.

Signed-off-by: Ido Yariv <idox.yariv@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index bd1fd8e..68bee81 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -492,6 +492,13 @@ void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
 		rx_chains_static = max(rx_chains_static, needed_static);
 		rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
 	}
+
+	/* Disable SMPS for the monitor interface */
+	sdata = rcu_dereference(local->monitor_sdata);
+	if (sdata &&
+	    rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
+		rx_chains_dynamic = rx_chains_static = local->rx_chains;
+
 	rcu_read_unlock();
 
 	if (!local->use_chanctx) {
-- 
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