signal: cleanup previous extended info if no new one given

E.g. if the modem switches from 4G to 3G while the extended signal
information is enabled, we should no longer expose LTE specific signal
quality values, only the UMTS specific ones.

E.g. to avoid this:

    $ mmcli -m 1 --signal-get
      -------------------------
      UMTS   | RSSI: '0,00' dBm
             | RSCP: '-92,00' dBm
             | EcIo: '-13,00' dB
      -------------------------
      LTE    | RSSI: '0,00' dBm
             | RSRQ: '-6,50' dB
             | RSRP: '-96,00' dBm
             |  SNR: '0,00' dB

1 files changed, 10 insertions, 5 deletions

diff --git a/src/mm-iface-modem-signal.c b/src/mm-iface-modem-signal.c
index 99096a957..c43b1b9f2 100644
--- a/src/mm-iface-modem-signal.c
+++ b/src/mm-iface-modem-signal.c
@@ -113,35 +113,40 @@ load_values_ready (MMIfaceModemSignal *self,
         mm_gdbus_modem_signal_set_cdma (skeleton, dictionary);
         g_variant_unref (dictionary);
         g_object_unref (cdma);
-    }
+    } else
+        mm_gdbus_modem_signal_set_cdma (skeleton, NULL);
 
     if (evdo) {
         dictionary = mm_signal_get_dictionary (evdo);
         mm_gdbus_modem_signal_set_evdo (skeleton, dictionary);
         g_variant_unref (dictionary);
         g_object_unref (evdo);
-    }
+    } else
+        mm_gdbus_modem_signal_set_evdo (skeleton, NULL);
 
     if (gsm) {
         dictionary = mm_signal_get_dictionary (gsm);
         mm_gdbus_modem_signal_set_gsm (skeleton, dictionary);
         g_variant_unref (dictionary);
         g_object_unref (gsm);
-    }
+    } else
+        mm_gdbus_modem_signal_set_gsm (skeleton, NULL);
 
     if (umts) {
         dictionary = mm_signal_get_dictionary (umts);
         mm_gdbus_modem_signal_set_umts (skeleton, dictionary);
         g_variant_unref (dictionary);
         g_object_unref (umts);
-    }
+    } else
+        mm_gdbus_modem_signal_set_umts (skeleton, NULL);
 
     if (lte) {
         dictionary = mm_signal_get_dictionary (lte);
         mm_gdbus_modem_signal_set_lte (skeleton, dictionary);
         g_variant_unref (dictionary);
         g_object_unref (lte);
-    }
+    } else
+        mm_gdbus_modem_signal_set_lte (skeleton, NULL);
 
     /* Flush right away */
     g_dbus_interface_skeleton_flush (G_DBUS_INTERFACE_SKELETON (skeleton));