qcacld-3.0: Race issue when link switch happens

For N-link, TDLS sends discovery request on different links
and starts timer to receive discovery response. There is one
race issue: if link switch happens before the timer stopped,
the timer count is reset because disconnection happens.

To resolve this issue, return if timer count is reset in
timer callback.

Change-Id: I7603de507f59dd988d70daad52fd4f4a2aa48d51
CRs-Fixed: 3586393

components/tdls/core/src/wlan_tdls_ct.c

@@ -108,6 +108,11 @@ void tdls_discovery_timeout_peer_cb(void *user_data)
 	if (!tdls_soc)
 		return;
 
+	/* timer_cnt is reset when link switch happens */
+	if (wlan_vdev_mlme_is_mlo_vdev(vdev) &&
+	    qdf_atomic_read(&tdls_soc->timer_cnt) == 0)
+		return;
+
 	if (wlan_vdev_mlme_is_mlo_vdev(vdev) &&
 	    qdf_atomic_dec_and_test(&tdls_soc->timer_cnt)) {
 		tdls_process_mlo_cal_tdls_link_score(vdev);