mac80211: send deauth only with channel context

When userspace asks to deauthenticate and we're just
authenticated (or still authenticating) send a deauth
frame instead of deleting the auth request.

On the other hand, if we've just disassociated and
therefore deleted all our state already, drop the
deauth request because we no longer have a channel
context to send it on.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/mlme.c

@@ -3662,40 +3662,44 @@ int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
 	bool tx = !req->local_state_change;
+	bool sent_frame = false;
 
 	mutex_lock(&ifmgd->mtx);
 
-	if (ifmgd->auth_data) {
-		ieee80211_destroy_auth_data(sdata, false);
-		mutex_unlock(&ifmgd->mtx);
-		return 0;
-	}
-
 	sdata_info(sdata,
 		   "deauthenticating from %pM by local choice (reason=%d)\n",
 		   req->bssid, req->reason_code);
 
-	if (ifmgd->associated &&
-	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
-		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
-				       req->reason_code, tx, frame_buf);
-	} else {
+	if (ifmgd->auth_data) {
 		drv_mgd_prepare_tx(sdata->local, sdata);
 		ieee80211_send_deauth_disassoc(sdata, req->bssid,
 					       IEEE80211_STYPE_DEAUTH,
 					       req->reason_code, tx,
 					       frame_buf);
+		ieee80211_destroy_auth_data(sdata, false);
+		mutex_unlock(&ifmgd->mtx);
+
+		sent_frame = tx;
+		goto out;
 	}
 
+	if (ifmgd->associated &&
+	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
+		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
+				       req->reason_code, tx, frame_buf);
+		sent_frame = tx;
+	}
 	mutex_unlock(&ifmgd->mtx);
 
-	__cfg80211_send_deauth(sdata->dev, frame_buf,
-			       IEEE80211_DEAUTH_FRAME_LEN);
-
+ out:
 	mutex_lock(&sdata->local->mtx);
 	ieee80211_recalc_idle(sdata->local);
 	mutex_unlock(&sdata->local->mtx);
 
+	if (sent_frame)
+		__cfg80211_send_deauth(sdata->dev, frame_buf,
+				       IEEE80211_DEAUTH_FRAME_LEN);
+
 	return 0;
 }