[PATCH 1/2] wifi: mt76: mt7996: clamp VHT/HE beamforming NSS

[Jiale Yao]

From: Jiale Yao <jiale.yao@xxxxxxxxxxx>

A peer can advertise a VHT or HE MCS map with no supported
spatial streams.  In that case mt7996_mcu_get_sta_nss() decrements
zero and produces 255 for the beamforming configuration.

Return zero when the MCS map has no supported streams.

Fixes: 98686cd21624 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
Signed-off-by: Jiale Yao <jiale.yao@xxxxxxxxxxx>
---
 drivers/net/wireless/mediatek/mt76/mt7996/mcu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
index cd7587ce5b8a..e6243dd33c31 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
@@ -120,7 +120,7 @@ mt7996_mcu_get_sta_nss(u16 mcs_map)
 			break;
 	}
 
-	return nss - 1;
+	return nss ? nss - 1 : 0;
 }
 
 static void
-- 
2.34.1