mac80211: don't try to do anything on unchanged genIE

When the genIE hasn't changed there's no reason to kick
the state machine since it won't be able to do anything
new -- doing this decreases the useless work we do for
reassociating because if we do kick the state machine
it will try to find a usable BSS but there might not be
one because wpa_supplicant will only change the BSSID
a little later.

In a sense this is a workaround for userspace behaviour,
but on the other hand userspace cannot really keep track
of what the kernel currently has for genIE since any
process could have changed that while wpa_supplicant
wasn't looking.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/mlme.c

@@ -2492,6 +2492,13 @@ int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
 {
 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 
+	if (len == 0 && ifmgd->extra_ie_len == 0)
+		return -EALREADY;
+
+	if (len == ifmgd->extra_ie_len && ifmgd->extra_ie &&
+	    memcmp(ifmgd->extra_ie, ie, len) == 0)
+		return -EALREADY;
+
 	kfree(ifmgd->extra_ie);
 	if (len == 0) {
 		ifmgd->extra_ie = NULL;

net/mac80211/wext.c

@@ -37,11 +37,12 @@ static int ieee80211_ioctl_siwgenie(struct net_device *dev,
 
 	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 		int ret = ieee80211_sta_set_extra_ie(sdata, extra, data->length);
-		if (ret)
+		if (ret && ret != -EALREADY)
 			return ret;
 		sdata->u.mgd.flags &= ~IEEE80211_STA_AUTO_BSSID_SEL;
 		sdata->u.mgd.flags &= ~IEEE80211_STA_EXT_SME;
 		sdata->u.mgd.flags &= ~IEEE80211_STA_CONTROL_PORT;
+		if (ret != -EALREADY)
 			ieee80211_sta_req_auth(sdata);
 		return 0;
 	}