BlackBerry bearer plugin: check whether device is online several times

This is supposed to workaround a race condition in the underlying
netstatus API: Sometimes we get an event that the Wifi interface
changed, but it is not up, e.g. no gateway (yet). In that case we need
to check back (currently: 300 ms) whether the interface has come
up or not.
This commit can be reverted again once the race condition in the
netstatus API has been resolved.

Task-number: QTBUG-29421
(cherry picked from commit 3dc47622a469ded1c99397fdedc2053b73d57189)

Change-Id: I252c39411340fe3f6af8440a8f21482ca9b6e62d
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>

2 files changed, 25 insertions, 0 deletions

diff --git a/src/network/bearer/qnetworkconfiguration_p.h b/src/network/bearer/qnetworkconfiguration_p.h
index cdeec36..b69ce87 100644
--- a/src/network/bearer/qnetworkconfiguration_p.h
+++ b/src/network/bearer/qnetworkconfiguration_p.h
@@ -59,6 +59,10 @@
 #include <QtCore/qmutex.h>
 #include <QtCore/qmap.h>
 
+#ifdef Q_OS_BLACKBERRY
+#include <bps/netstatus.h>
+#endif
+
 QT_BEGIN_NAMESPACE
 
 typedef QExplicitlySharedDataPointer<QNetworkConfigurationPrivate> QNetworkConfigurationPrivatePointer;
@@ -70,6 +74,9 @@ public:
         type(QNetworkConfiguration::Invalid),
         purpose(QNetworkConfiguration::UnknownPurpose),
         bearerType(QNetworkConfiguration::BearerUnknown),
+#ifdef Q_OS_BLACKBERRY
+        oldIpStatus(NETSTATUS_IP_STATUS_ERROR_UNKNOWN),
+#endif
         isValid(false), roamingSupported(false)
     {}
     virtual ~QNetworkConfigurationPrivate()
@@ -95,6 +102,10 @@ public:
     QNetworkConfiguration::Purpose purpose;
     QNetworkConfiguration::BearerType bearerType;
 
+#ifdef Q_OS_BLACKBERRY
+    netstatus_ip_status_t oldIpStatus;
+#endif
+
     bool isValid;
     bool roamingSupported;
 
diff --git a/src/plugins/bearer/blackberry/qbbengine.cpp b/src/plugins/bearer/blackberry/qbbengine.cpp
index 908fecc..7233dfa 100644
--- a/src/plugins/bearer/blackberry/qbbengine.cpp
+++ b/src/plugins/bearer/blackberry/qbbengine.cpp
@@ -45,6 +45,7 @@
 #include <QDebug>
 #include <QThreadStorage>
 #include <QStringList>
+#include <QTimer>
 
 #include <bps/netstatus.h>
 
@@ -369,6 +370,9 @@ void QBBEngine::updateConfiguration(const char *interface)
             changed = true;
         }
 
+        const netstatus_ip_status_t oldIpStatus = ptr->oldIpStatus;
+        ptr->oldIpStatus = ipStatus;
+
         ptrLocker.unlock();
 
         locker.unlock();
@@ -378,7 +382,17 @@ void QBBEngine::updateConfiguration(const char *interface)
 
             Q_EMIT configurationChanged(ptr);
         } else {
+            // maybe Wifi has changed but gateway not yet ready etc.
             qBearerDebug() << Q_FUNC_INFO << "configuration has not changed.";
+            if (oldIpStatus != ipStatus) { // if IP status changed
+                if (ipStatus != NETSTATUS_IP_STATUS_OK
+                        && ipStatus != NETSTATUS_IP_STATUS_ERROR_NOT_UP
+                        && ipStatus != NETSTATUS_IP_STATUS_ERROR_NOT_CONFIGURED) {
+                    // work around race condition in netstatus API by just checking
+                    // again in 300 ms
+                    QTimer::singleShot(300, this, SLOT(doRequestUpdate()));
+                }
+            }
         }
 
         return;