rndis_host: limit scope of bogus MAC address detection to ZTE devices

Reporting of bogus MAC addresses and ignoring configuration of new
destination address wasn't observed outside of a range of ZTE devices,
among which this seems to be the common bug. Align rndis_host driver
with implementation found in cdc_ether, which also limits this workaround
to ZTE devices.

Suggested-by: Bjørn Mork <bjorn@mork.no>
Cc: Kristian Evensen <kristian.evensen@gmail.com>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/usb/rndis_host.c b/drivers/net/usb/rndis_host.c
index 7a9ece2..4e70dec 100644 (file)
--- a/drivers/net/usb/rndis_host.c
+++ b/drivers/net/usb/rndis_host.c
@@ -418,10 +418,7 @@ generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
                goto halt_fail_and_release;
        }
 
-       if (bp[0] & 0x02)
-               eth_hw_addr_random(net);
-       else
-               eth_hw_addr_set(net, bp);
+       eth_hw_addr_set(net, bp);
 
        /* set a nonzero filter to enable data transfers */
        memset(u.set, 0, sizeof *u.set);
@@ -463,6 +460,16 @@ static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
        return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
 }
 
+static int zte_rndis_bind(struct usbnet *dev, struct usb_interface *intf)
+{
+       int status = rndis_bind(dev, intf);
+
+       if (!status && (dev->net->dev_addr[0] & 0x02))
+               eth_hw_addr_random(dev->net);
+
+       return status;
+}
+
 void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
 {
        struct rndis_halt       *halt;
@@ -615,7 +622,7 @@ static const struct driver_info     zte_rndis_info = {
        .description =  "ZTE RNDIS device",
        .flags =        FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
        .data =         RNDIS_DRIVER_DATA_DST_MAC_FIXUP,
-       .bind =         rndis_bind,
+       .bind =         zte_rndis_bind,
        .unbind =       rndis_unbind,
        .status =       rndis_status,
        .rx_fixup =     rndis_rx_fixup,