ath9k: add support for overriding the MAC address through platform data

On some devices the correct MAC address is not in the EEPROM data, but
stored somewhere else.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 79aec98..e22e821 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/slab.h>
+#include <linux/ath9k_platform.h>
 
 #include "ath9k.h"
 
@@ -537,6 +538,7 @@
 static int ath9k_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid,
 			    const struct ath_bus_ops *bus_ops)
 {
+	struct ath9k_platform_data *pdata = sc->dev->platform_data;
 	struct ath_hw *ah = NULL;
 	struct ath_common *common;
 	int ret = 0, i;
@@ -551,7 +553,7 @@
 	ah->hw_version.subsysid = subsysid;
 	sc->sc_ah = ah;
 
-	if (!sc->dev->platform_data)
+	if (!pdata)
 		ah->ah_flags |= AH_USE_EEPROM;
 
 	common = ath9k_hw_common(ah);
@@ -587,6 +589,9 @@
 	if (ret)
 		goto err_hw;
 
+	if (pdata && pdata->macaddr)
+		memcpy(common->macaddr, pdata->macaddr, ETH_ALEN);
+
 	ret = ath9k_init_queues(sc);
 	if (ret)
 		goto err_queues;