Retry failed sensor start once DBus service becomes available

When sensorfw is restarting/recovering DBus service is
momentarily not available. Give it another change once
the service becomes registered.

Change-Id: I6fd3e5985ac60cfffbc84ff86aabe9cebe110ab6
Reviewed-by: Lorn Potter <lorn.potter@canonical.com>

2 files changed, 10 insertions, 3 deletions

diff --git a/src/plugins/sensors/sensorfw/sensorfwsensorbase.cpp b/src/plugins/sensors/sensorfw/sensorfwsensorbase.cpp
index 17027778..27a07ad6 100644
--- a/src/plugins/sensors/sensorfw/sensorfwsensorbase.cpp
+++ b/src/plugins/sensors/sensorfw/sensorfwsensorbase.cpp
@@ -59,7 +59,8 @@ SensorfwSensorBase::SensorfwSensorBase(QSensor *sensor)
       m_efficientBufferSize(1),
       m_maxBufferSize(1),
       m_available(false),
-      running(false)
+      running(false),
+      m_attemptRestart(false)
 
 {
     watcher = new QDBusServiceWatcher("com.nokia.SensorService",QDBusConnection::systemBus(),
@@ -131,8 +132,12 @@ void SensorfwSensorBase::start()
         if (returnCode == 0) {
             running = true;
             return;
+        } else if (returnCode == QDBusError::ServiceUnknown) {
+            m_attemptRestart = true;
+            qWarning() << "m_sensorInterface did not start, DBus service unknown. Waiting for service registration and retrying.";
+        } else {
+            qWarning() << "m_sensorInterface did not start, error code:" << returnCode;
         }
-        qWarning() << "m_sensorInterface did not start, error code:" << returnCode;
     }
     sensorStopped();
 }
@@ -142,6 +147,7 @@ void SensorfwSensorBase::stop()
     if (m_sensorInterface)
         m_sensorInterface->stop();
     running = false;
+    m_attemptRestart = false;
 }
 
 void SensorfwSensorBase::setRanges(qreal correctionFactor)
@@ -219,7 +225,7 @@ void SensorfwSensorBase::connectToSensord()
         m_remoteSensorManager = 0;
         return;
     }
-    if (running) {
+    if (running || m_attemptRestart) {
         stop();
         reinitIsNeeded = true;
         start();
diff --git a/src/plugins/sensors/sensorfw/sensorfwsensorbase.h b/src/plugins/sensors/sensorfw/sensorfwsensorbase.h
index df8ca844..3e5e0538 100644
--- a/src/plugins/sensors/sensorfw/sensorfwsensorbase.h
+++ b/src/plugins/sensors/sensorfw/sensorfwsensorbase.h
@@ -113,6 +113,7 @@ private:
     QDBusServiceWatcher *watcher;
     bool m_available;
     bool running;
+    bool m_attemptRestart;
 private slots:
     void connectToSensord();
     void sensordUnregistered();