From 57b822aa21f651628ecdcfb23552cab4ab774b13 Mon Sep 17 00:00:00 2001
From: "Yueyao (Nathan) Zhu" <yueyao@google.com>
Date: Thu, 14 Jul 2016 11:10:19 -0700
Subject: [PATCH] BACKPORT: cdc_ncm: do not call usbnet_link_change from
cdc_ncm_bind
Bug: 28744625
usbnet_link_change will call schedule_work and should be
avoided if bind is failing. Otherwise we will end up with
scheduled work referring to a netdev which has gone away.
Instead of making the call conditional, we can just defer
it to usbnet_probe, using the driver_info flag made for
this purpose.
(cherry picked from commit 4d06dd537f95683aba3651098ae288b7cbff8274)
Change-Id: Ia3cdad73baea0dd7ff32bfd09b9f0a4bb596193d
---
drivers/net/usb/cdc_ncm.c | 20 +++++---------------
1 file changed, 5 insertions(+), 15 deletions(-)
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 43afde8f48d2..6ee9dd6ff78d 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -594,24 +594,13 @@ EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
{
- int ret;
-
/* MBIM backwards compatible function? */
cdc_ncm_select_altsetting(dev, intf);
if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
return -ENODEV;
/* NCM data altsetting is always 1 */
- ret = cdc_ncm_bind_common(dev, intf, 1);
-
- /*
- * We should get an event when network connection is "connected" or
- * "disconnected". Set network connection in "disconnected" state
- * (carrier is OFF) during attach, so the IP network stack does not
- * start IPv6 negotiation and more.
- */
- usbnet_link_change(dev, 0, 0);
- return ret;
+ return cdc_ncm_bind_common(dev, intf, 1);
}
static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
@@ -1157,7 +1146,8 @@ static void cdc_ncm_disconnect(struct usb_interface *intf)
static const struct driver_info cdc_ncm_info = {
.description = "CDC NCM",
- .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
+ .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
+ | FLAG_LINK_INTR,
.bind = cdc_ncm_bind,
.unbind = cdc_ncm_unbind,
.check_connect = cdc_ncm_check_connect,
@@ -1171,7 +1161,7 @@ static const struct driver_info cdc_ncm_info = {
static const struct driver_info wwan_info = {
.description = "Mobile Broadband Network Device",
.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
- | FLAG_WWAN,
+ | FLAG_LINK_INTR | FLAG_WWAN,
.bind = cdc_ncm_bind,
.unbind = cdc_ncm_unbind,
.check_connect = cdc_ncm_check_connect,
@@ -1185,7 +1175,7 @@ static const struct driver_info wwan_info = {
static const struct driver_info wwan_noarp_info = {
.description = "Mobile Broadband Network Device (NO ARP)",
.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
- | FLAG_WWAN | FLAG_NOARP,
+ | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
.bind = cdc_ncm_bind,
.unbind = cdc_ncm_unbind,
.check_connect = cdc_ncm_check_connect,
--
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