3.2.79-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Johannes Berg <johannes.berg@xxxxxxxxx>
commit cb150b9d23be6ee7f3a0fff29784f1c5b5ac514d upstream.
Since cfg80211 frequently takes actions from its netdev notifier
call, wireless extensions messages could still be ordered badly
since the wext netdev notifier, since wext is built into the
kernel, runs before the cfg80211 netdev notifier. For example,
the following can happen:
5: wlan1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default
link/ether 02:00:00:00:01:00 brd ff:ff:ff:ff:ff:ff
5: wlan1: <BROADCAST,MULTICAST,UP>
link/ether
when setting the interface down causes the wext message.
To also fix this, export the wireless_nlevent_flush() function
and also call it from the cfg80211 notifier.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
[bwh: Backported to 3.2:
- Add default case in cfg80211_netdev_notifier_call() which bypasses
the added wireless_nlevent_flush() (added upstream by commit
6784c7db8d43 "cfg80211: change return value of notifier function")
- Adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/include/net/iw_handler.h
+++ b/include/net/iw_handler.h
@@ -442,6 +442,12 @@ extern void wireless_send_event(struct n
unsigned int cmd,
union iwreq_data * wrqu,
const char * extra);
+#ifdef CONFIG_WEXT_CORE
+/* flush all previous wext events - if work is done from netdev notifiers */
+void wireless_nlevent_flush(void);
+#else
+static inline void wireless_nlevent_flush(void) {}
+#endif
/* We may need a function to send a stream of events to user space.
* More on that later... */
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -985,8 +985,12 @@ static int cfg80211_netdev_notifier_call
if (ret)
return notifier_from_errno(ret);
break;
+ default:
+ return NOTIFY_DONE;
}
+ wireless_nlevent_flush();
+
return NOTIFY_DONE;
}
--- a/net/wireless/wext-core.c
+++ b/net/wireless/wext-core.c
@@ -342,7 +342,7 @@ static const int compat_event_type_size[
/* IW event code */
-static void wireless_nlevent_flush(void)
+void wireless_nlevent_flush(void)
{
struct sk_buff *skb;
struct net *net;
@@ -355,6 +355,7 @@ static void wireless_nlevent_flush(void)
GFP_KERNEL);
}
}
+EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
static int wext_netdev_notifier_call(struct notifier_block *nb,
unsigned long state, void *ptr)
--
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