Fix a bug where the serial command queue sent the same command multiple times.

src/mm-generic-gsm.c

@@ -462,7 +462,6 @@ get_reg_status_done (MMSerial *serial,
 static void
 get_registration_status (MMSerial *serial, MMCallbackInfo *info)
 {
-    g_debug ("Queueing +CREG");
     mm_serial_queue_command (serial, "+CREG?", 3, get_reg_status_done, info);
 }
 

src/mm-serial.c

@@ -58,6 +58,7 @@ typedef struct {
     guint stopbits;
     guint64 send_delay;
 
+    guint queue_schedule;
     guint watch_id;
     guint timeout_id;
 } MMSerialPrivate;
@@ -323,6 +324,23 @@ typedef struct {
     guint32 timeout;
 } MMQueueData;
 
+static void
+mm_serial_schedule_queue_process (MMSerial *self)
+{
+    MMSerialPrivate *priv = MM_SERIAL_GET_PRIVATE (self);
+    GSource *source;
+
+    if (priv->queue_schedule)
+        /* Already scheduled */
+        return;
+
+    source = g_idle_source_new ();
+    g_source_set_closure (source, g_cclosure_new_object (G_CALLBACK (mm_serial_queue_process), G_OBJECT (self)));
+    g_source_attach (source, NULL);
+    priv->queue_schedule = g_source_get_id (source);
+    g_source_unref (source);
+}
+
 static void
 mm_serial_got_response (MMSerial *self, GError *error)
 {
@@ -346,7 +364,7 @@ mm_serial_got_response (MMSerial *self, GError *error)
 
     g_string_truncate (priv->response, 0);
     if (!g_queue_is_empty (priv->queue))
-        g_idle_add (mm_serial_queue_process, self);
+        mm_serial_schedule_queue_process (self);
 }
 
 static gboolean
@@ -377,6 +395,8 @@ mm_serial_queue_process (gpointer data)
     MMQueueData *info;
     GError *error = NULL;
 
+    priv->queue_schedule = 0;
+
     info = (MMQueueData *) g_queue_peek_head (priv->queue);
     if (!info)
         return FALSE;
@@ -557,7 +577,7 @@ mm_serial_queue_command (MMSerial *self,
     g_queue_push_tail (priv->queue, info);
 
     if (g_queue_get_length (priv->queue) == 1)
-        g_idle_add (mm_serial_queue_process, self);
+        mm_serial_schedule_queue_process (self);
 }
 
 typedef struct {