+ /* For uAPSD, things are a bit more complicated. If the
+ * last frame has a QoS header (i.e. is a QoS-data or
+ * QoS-nulldata frame) then just set the EOSP bit there
+ * and be done.
+ * If the frame doesn't have a QoS header (which means
+ * it should be a bufferable MMPDU) then we can't set
+ * the EOSP bit in the QoS header; add a QoS-nulldata
+ * frame to the list to send it after the MMPDU.
+ *
+ * Note that this code is only in the mac80211-release
+ * code path, we assume that the driver will not buffer
+ * anything but QoS-data frames, or if it does, will
+ * create the QoS-nulldata frame by itself if needed.
+ *
+ * Cf. 802.11-2012 10.2.1.10 (c).
+ */
+ if (qoshdr) {
+ *qoshdr |= IEEE80211_QOS_CTL_EOSP;