usb gadget: cdc ethernet notification bugfix

commit 29bac7b7661bbbdbbd32bc1e6cedca22f260da7f upstream

Bugfix for the new CDC Ethernet code:  as part of activating the
network interface's USB link, make sure its link management code
knows whether the interface is open or not.

Without this fix, the link won't work right when it's brought up
before the link is active ... because the initial notification it
sends will have the wrong link state (down, not up).  Makes it
hard to bridge these links (on the host side), among other things.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/u_ether.c b/drivers/usb/gadget/u_ether.c
index 3791e6271903e7384a2a6773281d323c9de4b833..38a55af3e4a5b7bc6bf9e023c76c59ddfefa10ef 100644 (file)
--- a/drivers/usb/gadget/u_ether.c
+++ b/drivers/usb/gadget/u_ether.c
@@ -873,6 +873,13 @@ struct net_device *gether_connect(struct gether *link)
                spin_lock(&dev->lock);
                dev->port_usb = link;
                link->ioport = dev;
+               if (netif_running(dev->net)) {
+                       if (link->open)
+                               link->open(link);
+               } else {
+                       if (link->close)
+                               link->close(link);
+               }
                spin_unlock(&dev->lock);
 
                netif_carrier_on(dev->net);