From 0ce46825b8df5e1ab6f84dcfe008e2097f25bdb5 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 12 Jul 2019 08:19:35 +0200
Subject: [PATCH] mt76: mt7603: fix invalid fallback rates

Only decrement the rate index on duplicate rates if it is not already 0

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 mt7603/mac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mt7603/mac.c b/mt7603/mac.c
index 112af150..a46eb44e 100644
--- a/mt7603/mac.c
+++ b/mt7603/mac.c
@@ -639,6 +639,9 @@ void mt7603_wtbl_set_rates(struct mt7603_dev *dev, struct mt7603_sta *sta,
 			    IEEE80211_TX_RC_40_MHZ_WIDTH)
 				continue;
 
+			if (!rates[i].idx)
+				continue;
+
 			rates[i].idx--;
 		}