[PATCH 4.4 86/96] mac80211: Suppress NEW_PEER_CANDIDATE event if no room

[Greg Kroah-Hartman]

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

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

From: Masashi Honma <masashi.honma@xxxxxxxxx>


[ Upstream commit 11197d006bcfabf0173a7820a163fcaac420d10e ]

Previously, kernel sends NEW_PEER_CANDIDATE event to user land even if
the found peer does not have any room to accept other peer. This causes
continuous connection trials.

Signed-off-by: Masashi Honma <masashi.honma@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/mac80211/mesh_plink.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -495,12 +495,14 @@ mesh_sta_info_alloc(struct ieee80211_sub
 
 	/* Userspace handles station allocation */
 	if (sdata->u.mesh.user_mpm ||
-	    sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
-		cfg80211_notify_new_peer_candidate(sdata->dev, addr,
-						   elems->ie_start,
-						   elems->total_len,
-						   GFP_KERNEL);
-	else
+	    sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
+		if (mesh_peer_accepts_plinks(elems) &&
+		    mesh_plink_availables(sdata))
+			cfg80211_notify_new_peer_candidate(sdata->dev, addr,
+							   elems->ie_start,
+							   elems->total_len,
+							   GFP_KERNEL);
+	} else
 		sta = __mesh_sta_info_alloc(sdata, addr);
 
 	return sta;