[ 53/89] mac80211: deinitialize ibss-internals after emptiness check

[Ben Hutchings]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Simon Wunderlich <simon.wunderlich@xxxxxxxxxxxxxxxxxxxx>

commit b78a4932f5fb11fadf41e69c606a33fa6787574c upstream.

The check whether the IBSS is active and can be removed should be
performed before deinitializing the fields used for the check/search.
Otherwise, the configured BSS will not be found and removed properly.

To make it more clear for the future, rename sdata->u.ibss to the
local pointer ifibss which is used within the checks.

This behaviour was introduced by
f3209bea110cade12e2b133da8b8499689cb0e2e
("mac80211: fix IBSS teardown race")

Cc: Ignacy Gawedzki <i@xxxxxx>
Signed-off-by: Simon Wunderlich <siwu@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 net/mac80211/ibss.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -965,10 +965,6 @@ int ieee80211_ibss_leave(struct ieee8021
 
 	mutex_lock(&sdata->u.ibss.mtx);
 
-	sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
-	memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
-	sdata->u.ibss.ssid_len = 0;
-
 	active_ibss = ieee80211_sta_active_ibss(sdata);
 
 	if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
@@ -989,6 +985,10 @@ int ieee80211_ibss_leave(struct ieee8021
 		}
 	}
 
+	ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
+	memset(ifibss->bssid, 0, ETH_ALEN);
+	ifibss->ssid_len = 0;
+
 	sta_info_flush(sdata->local, sdata);
 
 	/* remove beacon */


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