nl80211/cfg80211: add WIPHY_FLAG_AP_UAPSD flag

add WIPHY_FLAG_AP_UAPSD flag to indicate uapsd support on
AP mode.

Advertise it to userspace by including a new
NL80211_ATTR_SUPPORT_AP_UAPSD attribute.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index ad13903..0cda46a 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -720,6 +720,8 @@
 		NLA_PUT_FLAG(msg, NL80211_ATTR_SUPPORT_IBSS_RSN);
 	if (dev->wiphy.flags & WIPHY_FLAG_MESH_AUTH)
 		NLA_PUT_FLAG(msg, NL80211_ATTR_SUPPORT_MESH_AUTH);
+	if (dev->wiphy.flags & WIPHY_FLAG_AP_UAPSD)
+		NLA_PUT_FLAG(msg, NL80211_ATTR_SUPPORT_AP_UAPSD);
 
 	if (dev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM)
 		NLA_PUT_FLAG(msg, NL80211_ATTR_ROAM_SUPPORT);
@@ -2601,7 +2603,8 @@
 		return -EINVAL;
 
 	/* parse WME attributes if sta is WME capable */
-	if ((params.sta_flags_set & NL80211_STA_FLAG_WME) &&
+	if ((rdev->wiphy.flags & WIPHY_FLAG_AP_UAPSD) &&
+	    (params.sta_flags_set & NL80211_STA_FLAG_WME) &&
 	    info->attrs[NL80211_ATTR_STA_WME]) {
 		struct nlattr *tb[NL80211_STA_WME_MAX + 1];
 		struct nlattr *nla;