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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/usb/gadget/u_ether.c b/drivers/usb/gadget/u_ether.c
index 2ac1d214732..a52404a1aef 100644
--- a/drivers/usb/gadget/u_ether.c
+++ b/drivers/usb/gadget/u_ether.c
@@ -803,12 +803,6 @@ 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);
@@ -822,6 +816,12 @@ 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;