wlcore: ignore dummy packet events in PLT mode

Sometimes the firmware sends a dummy packet event while we are in PLT
mode. This doesn't make sense, it's a firmware bug. Fix this by
ignoring dummy packet events when we're PLT mode.

Reported-by: Yegor Yefremov <[e-mail]>
Reported-by: Arik Nemtsov <[e-mail]>
Signed-off-by: Luciano Coelho <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/ti/wlcore/event.c

···
 
 void wlcore_event_dummy_packet(struct wl1271 *wl)
 {
+	if (wl->plt) {
+		wl1271_info("Got DUMMY_PACKET event in PLT mode.  FW bug, ignoring.");
+		return;
+	}
+
 	wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
 	wl1271_tx_dummy_packet(wl);
 }