mac80211: allow re-open the blocked peer link in mesh

Peer link which is blocked using the "iw mesh0 station
set <MAC addr> plink_action block" is previously not able
to re-open using "iw mesh0 station set <MAC addr>
plink_action open". This patch is intended to solve this.

If the station plink state remains at OPN_SNT once open,
try block and open again should solve this problem.
Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/mesh_plink.c

@@ -537,7 +537,8 @@ int mesh_plink_open(struct sta_info *sta)
 	spin_lock_bh(&sta->lock);
 	get_random_bytes(&llid, 2);
 	sta->llid = llid;
-	if (sta->plink_state != NL80211_PLINK_LISTEN) {
+	if (sta->plink_state != NL80211_PLINK_LISTEN &&
+	    sta->plink_state != NL80211_PLINK_BLOCKED) {
 		spin_unlock_bh(&sta->lock);
 		return -EBUSY;
 	}