asynchronous and deferred port detection

Allow plugins to perform asynchronous port detection, and to defer port detection
until later.  This moves the prober bits into MMPluginBase so that all plugins
can take adavantage of it only when needed; the probing is not done at udev time.
Furthermore, plugins like Novatel can flip the secondary ports over the AT mode
through	deferred detection, by deferring the secondary ports until the main port
has been detected and AT$NWDMAT	has been sent.

This commit also finishes the port of the rest of the plugins (except mbm) over
to the new port detection methods and plugin API.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/mm-serial-parsers.c b/src/mm-serial-parsers.c
index 8e6b75b8..ae0c20da 100644
--- a/src/mm-serial-parsers.c
+++ b/src/mm-serial-parsers.c
@@ -87,6 +87,9 @@ mm_serial_parser_v0_parse (gpointer data,
     g_return_val_if_fail (parser != NULL, FALSE);
     g_return_val_if_fail (response != NULL, FALSE);
 
+    if (G_UNLIKELY (!response->len || !strlen (response->str)))
+        return FALSE;
+
     found = g_regex_match_full (parser->generic_response, response->str, response->len, 0, 0, &match_info, NULL);
     if (found) {
         str = g_match_info_fetch (match_info, 1);
@@ -205,7 +208,10 @@ mm_serial_parser_v1_parse (gpointer data,
     g_return_val_if_fail (parser != NULL, FALSE);
     g_return_val_if_fail (response != NULL, FALSE);
 
-    /* First, check for successfule responses */
+    if (G_UNLIKELY (!response->len || !strlen (response->str)))
+        return FALSE;
+
+    /* First, check for successful responses */
 
     found = g_regex_match_full (parser->regex_ok, response->str, response->len, 0, 0, NULL, NULL);
     if (found)