From 97af743207466ff8b477e14bfb7af0ba2c93375b Mon Sep 17 00:00:00 2001
From: Bob Copeland <me@bobcopeland.com>
Date: Wed, 29 Jul 2009 10:13:03 +0200
Subject: mac80211: disable beacons before removing the associated interface

When downing interfaces, it's a good idea to tell the driver to
stop sending beacons; that way the driver doesn't need special
code in ops->remove_interface() when it should already handle the
case in bss_info_changed().

This fixes a potential crash with at least ath5k since the vif
pointer will be nullified while beacon interrupts are still active.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 6c655b6..6614d4f 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -522,6 +522,16 @@ static int ieee80211_stop(struct net_device *dev)
 				ieee80211_scan_completed(&local->hw, true);
 		}
 
+		/*
+		 * Disable beaconing for AP and mesh, IBSS can't
+		 * still be joined to a network at this point.
+		 */
+		if (sdata->vif.type == NL80211_IFTYPE_AP ||
+		    sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
+			ieee80211_bss_info_change_notify(sdata,
+				BSS_CHANGED_BEACON_ENABLED);
+		}
+
 		conf.vif = &sdata->vif;
 		conf.type = sdata->vif.type;
 		conf.mac_addr = dev->dev_addr;
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 9dd8d25..5e76dd1 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -198,7 +198,8 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 	}
 
 	if (changed & BSS_CHANGED_BEACON_ENABLED) {
-		if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
+		if (local->quiescing || !netif_running(sdata->dev) ||
+		    test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 			sdata->vif.bss_conf.enable_beacon = false;
 		} else {
 			/*
diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index 5e3d476..3320f7d 100644
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -96,6 +96,10 @@ int __ieee80211_suspend(struct ieee80211_hw *hw)
 		if (!netif_running(sdata->dev))
 			continue;
 
+		/* disable beaconing */
+		ieee80211_bss_info_change_notify(sdata,
+			BSS_CHANGED_BEACON_ENABLED);
+
 		conf.vif = &sdata->vif;
 		conf.type = sdata->vif.type;
 		conf.mac_addr = sdata->dev->dev_addr;
-- 
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