usb: gadget: Fix g_ether interface link status

commit 31bde1ceaa873bcaecd49e829bfabceacc4c512d upstream.

A "usb0" interface that has never been connected to a host has an unknown
operstate, and therefore the IFF_RUNNING flag is (incorrectly) asserted
when queried by ifconfig, ifplugd, etc.  This is a result of calling
netif_carrier_off() too early in the probe function; it should be called
after register_netdev().

Similar problems have been fixed in many other drivers, e.g.:

    e826eafa6 (bonding: Call netif_carrier_off after register_netdevice)
    0d672e9f8 (drivers/net: Call netif_carrier_off at the end of the probe)
    6a3c869a6 (cxgb4: fix reported state of interfaces without link)

Fix is to move netif_carrier_off() to the end of the function.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/gadget/u_ether.c b/drivers/usb/gadget/u_ether.c
index 29c854b..4e1f0aa 100644 (file)
--- a/drivers/usb/gadget/u_ether.c
+++ b/drivers/usb/gadget/u_ether.c
@@ -796,12 +796,6 @@ int gether_setup(struct usb_gadget *g, u8 ethaddr[ETH_ALEN])
 
        SET_ETHTOOL_OPS(net, &ops);
 
-       /* two kinds of host-initiated state changes:
-        *  - iff DATA transfer is active, carrier is "on"
-        *  - tx queueing enabled if open *and* carrier is "on"
-        */
-       netif_carrier_off(net);
-
        dev->gadget = g;
        SET_NETDEV_DEV(net, &g->dev);
        SET_NETDEV_DEVTYPE(net, &gadget_type);
@@ -815,6 +809,12 @@ int gether_setup(struct usb_gadget *g, u8 ethaddr[ETH_ALEN])
                INFO(dev, "HOST MAC %pM\n", dev->host_mac);
 
                the_dev = dev;
+
+               /* two kinds of host-initiated state changes:
+                *  - iff DATA transfer is active, carrier is "on"
+                *  - tx queueing enabled if open *and* carrier is "on"
+                */
+               netif_carrier_off(net);
        }
 
        return status;