[PATCH 4/4] mt76: mt7603: fix invalid fallback rates

[Felix Fietkau]

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

Signed-off-by: Felix Fietkau <n...@nbd.name>
---
 drivers/net/wireless/mediatek/mt76/mt7603/mac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7603/mac.c 
b/drivers/net/wireless/mediatek/mt76/mt7603/mac.c
index 40db1cbc832d..81fb4276e742 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7603/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/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--;
                }
 
-- 
2.17.0