rt2x00: Don't set unicast/BSSID masks when clearning MAC or BSSID

When configuring the MAC_ADDR or MAC_BSSID with an empty address,
the UNICAST_TO_ME_MASK and BSS_ID_MASK must also be reset to prevent
invalid interpretation of the addresses.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800lib.c

@@ -1135,19 +1135,23 @@ void rt2800_config_intf(struct rt2x00_dev *rt2x00dev, struct rt2x00_intf *intf,
 	}
 
 	if (flags & CONFIG_UPDATE_MAC) {
+		if (!is_zero_ether_addr((const u8 *)conf->mac)) {
 			reg = le32_to_cpu(conf->mac[1]);
 			rt2x00_set_field32(&reg, MAC_ADDR_DW1_UNICAST_TO_ME_MASK, 0xff);
 			conf->mac[1] = cpu_to_le32(reg);
+		}
 
 		rt2800_register_multiwrite(rt2x00dev, MAC_ADDR_DW0,
 					      conf->mac, sizeof(conf->mac));
 	}
 
 	if (flags & CONFIG_UPDATE_BSSID) {
+		if (!is_zero_ether_addr((const u8 *)conf->bssid)) {
 			reg = le32_to_cpu(conf->bssid[1]);
 			rt2x00_set_field32(&reg, MAC_BSSID_DW1_BSS_ID_MASK, 3);
 			rt2x00_set_field32(&reg, MAC_BSSID_DW1_BSS_BCN_NUM, 7);
 			conf->bssid[1] = cpu_to_le32(reg);
+		}
 
 		rt2800_register_multiwrite(rt2x00dev, MAC_BSSID_DW0,
 					      conf->bssid, sizeof(conf->bssid));