wifi: mt76: mt7921: do not support one stream on secondary antenna only

mt7921 support following antenna combiantions only.
* primary + secondary (2x2)
* primary only        (1x1)

Since we cannot work on secondary antenna only, return error if the
antenna bitmap is 0x2 in .set_antenna().

For example:
iw phy0 set antenna 3 3 /* valid */
iw phy0 set antenna 1 1 /* valid */
iw phy0 set antenna 2 2 /* invalid */

Cc: stable@vger.kernel.org
Fixes: e0f9fdda81bd ("mt76: mt7921: add ieee80211_ops")
Suggested-by: Knox Chiou <knoxchiou@google.com>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 3b6adb2..0e3ada1 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -1363,7 +1363,7 @@ mt7921_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
                return -EINVAL;
 
        if ((BIT(hweight8(tx_ant)) - 1) != tx_ant)
-               tx_ant = BIT(ffs(tx_ant) - 1) - 1;
+               return -EINVAL;
 
        mt7921_mutex_acquire(dev);