Lock the whole replace operation in a mutex.

src/modules/partition/gui/ChoicePage.cpp

@@ -46,6 +46,8 @@
 #include <QDir>
 #include <QLabel>
 #include <QListView>
+#include <QFutureWatcher>
+#include <QtConcurrent/QtConcurrent>
 
 
 
@@ -433,28 +435,34 @@ ChoicePage::applyActionChoice( ChoicePage::Choice choice )
         connect( m_beforePartitionBarsView->selectionModel(), &QItemSelectionModel::currentRowChanged,
                  this, [ this ]( const QModelIndex& current, const QModelIndex& previous )
         {
-            auto doReplace = [=]
+            QFutureWatcher< void >* watcher = new QFutureWatcher< void >();
+            connect( watcher, &QFutureWatcher< void >::finished,
+                     this, [ watcher ]
             {
+                watcher->deleteLater();
+            } );
+
+            auto doReplace = [ this, current, dev = selectedDevice() ]
+            {
+                QMutexLocker( &( this->m_coreMutex ) );
+
+                if ( m_core->isDirty() )
+                {
+                    m_core->revertDevice( dev );
+                }
                 // We can't use the PartitionPtrRole because we need to make changes to the
                 // main DeviceModel, not the immutable copy.
                 QString partPath = current.data( PartitionModel::PartitionPathRole ).toString();
-                Partition* partition = KPMHelpers::findPartitionByPath( { selectedDevice() },
+                Partition* partition = KPMHelpers::findPartitionByPath( { dev },
                                                                         partPath );
                 if ( partition )
                     PartitionActions::doReplacePartition( m_core,
-                                                          selectedDevice(),
+                                                          dev,
                                                           partition );
-                PartitionModel* m = qobject_cast< PartitionModel* >( m_afterPartitionBarsView->model() );
-                if ( m )
-                    m->update();
             };
 
-            if ( m_core->isDirty() )
-            {
-                m_core->asyncRevertDevice( selectedDevice(), doReplace );
-            }
-            else
-                doReplace();
+            QFuture< void > future = QtConcurrent::run( doReplace );
+            watcher->setFuture( future );
         } );
         break;
     case NoChoice:

src/modules/partition/gui/ChoicePage.h

@@ -105,6 +105,8 @@ private:
     QPointer< PartitionLabelsView > m_afterPartitionLabelsView;
 
     int m_lastSelectedDeviceIndex;
+
+    QMutex m_coreMutex;
 };
 
 #endif // CHOICEPAGE_H