mwl8k: clear hardware MAC address if no STA interface configured

If there is no STA interface configured, clear the hardware MAC
address to prevent ACKing frames sent to our MAC address.
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwl8k.c

@@ -280,6 +280,7 @@ static const struct ieee80211_rate mwl8k_rates[] = {
 #define MWL8K_CMD_MIMO_CONFIG		0x0125
 #define MWL8K_CMD_USE_FIXED_RATE	0x0126
 #define MWL8K_CMD_ENABLE_SNIFFER	0x0150
+#define MWL8K_CMD_SET_MAC_ADDR		0x0202
 #define MWL8K_CMD_SET_RATEADAPT_MODE	0x0203
 #define MWL8K_CMD_UPDATE_STADB		0x1123
 
@@ -309,6 +310,7 @@ static const char *mwl8k_cmd_name(u16 cmd, char *buf, int bufsize)
 		MWL8K_CMDNAME(MIMO_CONFIG);
 		MWL8K_CMDNAME(USE_FIXED_RATE);
 		MWL8K_CMDNAME(ENABLE_SNIFFER);
+		MWL8K_CMDNAME(SET_MAC_ADDR);
 		MWL8K_CMDNAME(SET_RATEADAPT_MODE);
 		MWL8K_CMDNAME(UPDATE_STADB);
 	default:
@@ -1902,6 +1904,34 @@ static int mwl8k_enable_sniffer(struct ieee80211_hw *hw, bool enable)
 	return rc;
 }
 
+/*
+ * CMD_SET_MAC_ADDR.
+ */
+struct mwl8k_cmd_set_mac_addr {
+	struct mwl8k_cmd_pkt header;
+	__u8 mac_addr[ETH_ALEN];
+} __attribute__((packed));
+
+static int mwl8k_set_mac_addr(struct ieee80211_hw *hw, u8 *mac)
+{
+	struct mwl8k_cmd_set_mac_addr *cmd;
+	int rc;
+
+	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
+	if (cmd == NULL)
+		return -ENOMEM;
+
+	cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_MAC_ADDR);
+	cmd->header.length = cpu_to_le16(sizeof(*cmd));
+	memcpy(cmd->mac_addr, mac, ETH_ALEN);
+
+	rc = mwl8k_post_cmd(hw, &cmd->header);
+	kfree(cmd);
+
+	return rc;
+}
+
+
 /*
  * CMD_SET_RATEADAPT_MODE.
  */
@@ -2527,7 +2557,8 @@ static int mwl8k_add_interface(struct ieee80211_hw *hw,
 	mwl8k_vif = MWL8K_VIF(conf->vif);
 	memset(mwl8k_vif, 0, sizeof(*mwl8k_vif));
 
-	/* Save the mac address */
+	/* Set and save the mac address */
+	mwl8k_set_mac_addr(hw, conf->mac_addr);
 	memcpy(mwl8k_vif->mac_addr, conf->mac_addr, ETH_ALEN);
 
 	/* Back pointer to parent config block */
@@ -2555,6 +2586,8 @@ static void mwl8k_remove_interface(struct ieee80211_hw *hw,
 	if (priv->vif == NULL)
 		return;
 
+	mwl8k_set_mac_addr(hw, "\x00\x00\x00\x00\x00\x00");
+
 	priv->vif = NULL;
 }
 
@@ -3025,6 +3058,14 @@ static int __devinit mwl8k_probe(struct pci_dev *pdev,
 		goto err_stop_firmware;
 	}
 
+	/* Clear MAC address */
+	rc = mwl8k_set_mac_addr(hw, "\x00\x00\x00\x00\x00\x00");
+	if (rc) {
+		printk(KERN_ERR "%s: Cannot clear MAC address\n",
+		       wiphy_name(hw->wiphy));
+		goto err_stop_firmware;
+	}
+
 	/* Disable interrupts */
 	iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
 	free_irq(priv->pdev->irq, hw);