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[PATCH] mac80211: use min rate as basic rate for buggy APs

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Some buggy APs (and even P2P_GO) don't advertise their
basic rates in the association response.

In such case, use the min supported rate as the
basic rate.

Reported-by: Pontus Fuchs <pontus.fuchs@xxxxxxxxx>
Signed-off-by: Eliad Peller <eliad@xxxxxxxxxx>
---
 net/mac80211/mlme.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 0e5d8da..064df37 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1482,6 +1482,7 @@ static bool ieee80211_assoc_success(struct ieee80211_work *wk,
 	int i, j, err;
 	bool have_higher_than_11mbit = false;
 	u16 ap_ht_cap_flags;
+	int min_rate = INT_MAX, min_rate_index = -1;
 
 	/* AssocResp and ReassocResp have identical structure */
 
@@ -1537,6 +1538,10 @@ static bool ieee80211_assoc_success(struct ieee80211_work *wk,
 				rates |= BIT(j);
 				if (is_basic)
 					basic_rates |= BIT(j);
+				if (rate < min_rate) {
+					min_rate = rate;
+					min_rate_index = j;
+				}
 				break;
 			}
 		}
@@ -1554,11 +1559,22 @@ static bool ieee80211_assoc_success(struct ieee80211_work *wk,
 				rates |= BIT(j);
 				if (is_basic)
 					basic_rates |= BIT(j);
+				if (rate < min_rate) {
+					min_rate = rate;
+					min_rate_index = j;
+				}
 				break;
 			}
 		}
 	}
 
+	/*
+	 * some buggy APs don't advertise basic_rates. use the lowest
+	 * supported rate instead.
+	 */
+	if (unlikely(!basic_rates) && min_rate_index >= 0)
+		basic_rates = BIT(min_rate_index);
+
 	sta->sta.supp_rates[wk->chan->band] = rates;
 	sdata->vif.bss_conf.basic_rates = basic_rates;
 
-- 
1.7.6.401.g6a319

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