[ 3.8.y.z extended stable ] Patch "net: qmi_wwan: prevent duplicate mac address on link (firmware bug" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    net: qmi_wwan: prevent duplicate mac address on link (firmware bug

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.4.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 71d870fd97d4870bc860bad72621663cacb1e7c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Mork?= <bjorn at mork.no>
Date: Thu, 18 Apr 2013 12:57:11 +0000
Subject: net: qmi_wwan: prevent duplicate mac address on link (firmware bug
 workaround)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

commit cc6ba5fdaabea7a7b28de3ba1e0fe54d92232fe5 upstream.

We normally trust and use the CDC functional descriptors provided by a
number of devices.  But some of these will erroneously list the address
reserved for the device end of the link.  Attempting to use this on
both the device and host side will naturally not work.

Work around this bug by ignoring the functional descriptor and assign a
random address instead in this case.

Signed-off-by: Bjørn Mork <bjorn at mork.no>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/net/usb/qmi_wwan.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 31b9d45..36cb456 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -53,6 +53,9 @@ struct qmi_wwan_state {
 	struct usb_interface *data;
 };

+/* default ethernet address used by the modem */
+static const u8 default_modem_addr[ETH_ALEN] = {0x02, 0x50, 0xf3};
+
 /* Make up an ethernet header if the packet doesn't have one.
  *
  * A firmware bug common among several devices cause them to send raw
@@ -314,6 +317,12 @@ next_desc:
 		usb_driver_release_interface(driver, info->data);
 	}

+	/* Never use the same address on both ends of the link, even
+	 * if the buggy firmware told us to.
+	 */
+	if (!compare_ether_addr(dev->net->dev_addr, default_modem_addr))
+		eth_hw_addr_random(dev->net);
+
 	/* make MAC addr easily distinguishable from an IP header */
 	if (possibly_iphdr(dev->net->dev_addr)) {
 		dev->net->dev_addr[0] |= 0x02;	/* set local assignment bit */
--
1.8.1.2