linux-kernel - [ 13/49] usb: gadget: Fix g

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Message-Id: <20120807222028.050350415@linuxfoundation.org>
Date:	Tue,  7 Aug 2012 15:44:31 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Kevin Cernekee <cernekee@...il.com>,
	Felipe Balbi <balbi@...com>
Subject: [ 13/49] usb: gadget: Fix g_ether interface link status

From: Greg KH <gregkh@...uxfoundation.org>

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kevin Cernekee <cernekee@...il.com>

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@...il.com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/u_ether.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- 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, u
 
 	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, u
 		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;


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