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cfg80211/wext: fix message ordering

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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.

Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2016-01-27 13:29:34 +01:00
parent 8bf862739a
commit cb150b9d23
3 changed files with 10 additions and 1 deletions
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3
net/wireless/wext-core.c
View file

@ -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)