cfg80211: properly send NL80211_ATTR_DISCONNECTED_BY_AP in disconnect

When we disconnect from the AP, drivers call cfg80211_disconnect().
This doesn't know whether the disconnection was initiated locally
or by the AP though, which can cause problems with the supplicant,
for example with WPS. This issue obviously doesn't show up with any
mac80211 based driver since mac80211 doesn't call this function.

Fix this by requiring drivers to indicate whether the disconnect is
locally generated or not. I've tried to update the drivers, but may
not have gotten the values correct, and some drivers may currently
not be able to report correct values. In case of doubt I left it at
false, which is the current behaviour.

For libertas, make adjustments as indicated by Dan Williams.

Reported-by: Matthieu Mauger <matthieux.mauger@intel.com>
Tested-by: Matthieu Mauger <matthieux.mauger@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index d11454f..8020b5b 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -938,7 +938,8 @@
 }
 
 void cfg80211_disconnected(struct net_device *dev, u16 reason,
-			   const u8 *ie, size_t ie_len, gfp_t gfp)
+			   const u8 *ie, size_t ie_len,
+			   bool locally_generated, gfp_t gfp)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
@@ -954,6 +955,7 @@
 	ev->dc.ie_len = ie_len;
 	memcpy((void *)ev->dc.ie, ie, ie_len);
 	ev->dc.reason = reason;
+	ev->dc.locally_generated = locally_generated;
 
 	spin_lock_irqsave(&wdev->event_lock, flags);
 	list_add_tail(&ev->list, &wdev->event_list);