1 files changed, 36 insertions, 5 deletions

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
index fe01da9e620d..7485e784be2a 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
@@ -190,6 +190,31 @@ done:
 	return err;
 }
 
+int brcmf_c_set_cur_etheraddr(struct brcmf_if *ifp, const u8 *addr)
+{
+	s32 err;
+
+	err = brcmf_fil_iovar_data_set(ifp, "cur_etheraddr", addr, ETH_ALEN);
+	if (err < 0)
+		bphy_err(ifp->drvr, "Setting cur_etheraddr failed, %d\n", err);
+
+	return err;
+}
+
+/* On some boards there is no eeprom to hold the nvram, in this case instead
+ * a board specific nvram is loaded from /lib/firmware. On most boards the
+ * macaddr setting in the /lib/firmware nvram file is ignored because the
+ * wifibt chip has a unique MAC programmed into the chip itself.
+ * But in some cases the actual MAC from the /lib/firmware nvram file gets
+ * used, leading to MAC conflicts.
+ * The MAC addresses in the troublesome nvram files seem to all come from
+ * the same nvram file template, so we only need to check for 1 known
+ * address to detect this.
+ */
+static const u8 brcmf_default_mac_address[ETH_ALEN] = {
+	0x00, 0x90, 0x4c, 0xc5, 0x12, 0x38
+};
+
 int brcmf_c_preinit_dcmds(struct brcmf_if *ifp)
 {
 	struct brcmf_pub *drvr = ifp->drvr;
@@ -204,12 +229,9 @@ int brcmf_c_preinit_dcmds(struct brcmf_if *ifp)
 
 	if (is_valid_ether_addr(ifp->mac_addr)) {
 		/* set mac address */
-		err = brcmf_fil_iovar_data_set(ifp, "cur_etheraddr", ifp->mac_addr,
-					       ETH_ALEN);
-		if (err < 0) {
-			bphy_err(ifp->drvr, "Setting cur_etheraddr failed, %d\n", err);
+		err = brcmf_c_set_cur_etheraddr(ifp, ifp->mac_addr);
+		if (err < 0)
 			goto done;
-		}
 	} else {
 		/* retrieve mac address */
 		err = brcmf_fil_iovar_data_get(ifp, "cur_etheraddr", ifp->mac_addr,
@@ -218,6 +240,15 @@ int brcmf_c_preinit_dcmds(struct brcmf_if *ifp)
 			bphy_err(drvr, "Retrieving cur_etheraddr failed, %d\n", err);
 			goto done;
 		}
+
+		if (ether_addr_equal_unaligned(ifp->mac_addr, brcmf_default_mac_address)) {
+			bphy_err(drvr, "Default MAC is used, replacing with random MAC to avoid conflicts\n");
+			eth_random_addr(ifp->mac_addr);
+			ifp->ndev->addr_assign_type = NET_ADDR_RANDOM;
+			err = brcmf_c_set_cur_etheraddr(ifp, ifp->mac_addr);
+			if (err < 0)
+				goto done;
+		}
 	}
 
 	memcpy(ifp->drvr->mac, ifp->mac_addr, sizeof(ifp->drvr->mac));