Originally Posted by nieldk

Got it! I will ask devs of power kernel to add these patches

We need two patches to kernel/net/wireless/chan.c and kernel/net/mac80211/tx.c

Code:

diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index b01a6f6..09d979b 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -49,9 +49,12 @@ int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
 {
 	struct ieee80211_channel *chan;
 	int result;
+	struct wireless_dev *mon_dev = NULL;
 
-	if (wdev && wdev->iftype == NL80211_IFTYPE_MONITOR)
+	if (wdev && wdev->iftype == NL80211_IFTYPE_MONITOR) {
+		mon_dev = wdev;
 		wdev = NULL;
+	}
 
 	if (wdev) {
 		ASSERT_WDEV_LOCK(wdev);
@@ -76,5 +79,8 @@ int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
 	if (wdev)
 		wdev->channel = chan;
 
+	if (mon_dev)
+		mon_dev->channel = chan;
+
 	return 0;
 }

Code:

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 0855cac..221bed6 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -677,11 +677,19 @@ int tid;
 
 	/*
 	 * Packet injection may want to control the sequence
-	 * number, if we have no matching interface then we
-	 * neither assign one ourselves nor ask the driver to.
+	 * number, so if an injected packet is found, skip
+	 * renumbering it. Also make the packet NO_ACK to avoid
+	 * excessive retries (ACKing and retrying should be
+	 * handled by the injecting application).
+	 * FIXME This may break hostapd and some other injectors.
+	 * This should be done using a radiotap flag.
 	 */
-	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
+	if (unlikely((info->flags & IEEE80211_TX_CTL_INJECTED) &&
+	   !(tx->sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))) {
+		if (!ieee80211_has_morefrags(hdr->frame_control))
+			info->flags |= IEEE80211_TX_CTL_NO_ACK;
 		return TX_CONTINUE;
+	}
 
 	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
 		return TX_CONTINUE;