wifi: ath9k: return by of_get_mac_address

[ Upstream commit dfffb31 ]

When using nvmem, ath9k could potentially be loaded before nvmem, which
loads after mtd. This is an issue if DT contains an nvmem mac address.

If nvmem is not ready in time for ath9k, -EPROBE_DEFER is returned. Pass
it to _probe so that ath9k can properly grab a potentially present MAC
address.

Signed-off-by: Rosen Penev <[email protected]>
Acked-by: Toke Høiland-Jørgensen <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jeff Johnson <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: neheb

drivers/net/wireless/ath/ath9k/init.c

@@ -691,7 +691,9 @@ static int ath9k_of_init(struct ath_softc *sc)
 		ah->ah_flags |= AH_NO_EEP_SWAP;
 	}
 
-	of_get_mac_address(np, common->macaddr);
+	ret = of_get_mac_address(np, common->macaddr);
+	if (ret == -EPROBE_DEFER)
+		return ret;
 
 	return 0;
 }