[PATCH 5.15 17/28] wifi: mt76: mt7921: do not support one stream on secondary antenna only

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Deren Wu <deren.wu@xxxxxxxxxxxx>

commit d616d3680264beb9a9d2c4fc681064b06f447eeb upstream.

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@xxxxxxxxxxxxxxx
Fixes: e0f9fdda81bd ("mt76: mt7921: add ieee80211_ops")
Suggested-by: Knox Chiou <knoxchiou@xxxxxxxxxx>
Signed-off-by: Deren Wu <deren.wu@xxxxxxxxxxxx>
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/wireless/mediatek/mt76/mt7921/main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -994,7 +994,7 @@ mt7921_set_antenna(struct ieee80211_hw *
 		return -EINVAL;
 
 	if ((BIT(hweight8(tx_ant)) - 1) != tx_ant)
-		tx_ant = BIT(ffs(tx_ant) - 1) - 1;
+		return -EINVAL;
 
 	mt7921_mutex_acquire(dev);
 





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