From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Date: Fri, 31 Aug 2018 01:04:13 +0200
Subject: [PATCH] mac80211: fix an off-by-one issue in A-MSDU
 max_subframe computation

Initialize 'n' to 2 in order to take into account also the first
packet in the estimation of max_subframe limit for a given A-MSDU
since frag_tail pointer is NULL when ieee80211_amsdu_aggregate
routine analyzes the second frame.

Fixes: 6e0456b54545 ("mac80211: add A-MSDU tx support")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3166,7 +3166,7 @@ static bool ieee80211_amsdu_aggregate(st
 	void *data;
 	bool ret = false;
 	unsigned int orig_len;
-	int n = 1, nfrags, pad = 0;
+	int n = 2, nfrags, pad = 0;
 	u16 hdrlen;
 
 	if (!ieee80211_hw_check(&local->hw, TX_AMSDU))