unload usb-storage driver between games

stepmania/src/MemoryCardManager.cpp

@@ -235,4 +235,6 @@ void MemoryCardManager::FlushAllDisks()
 			continue;	// skip
 		m_pDriver->Flush(&m_Device[p]);
 	}
+
+	m_pDriver->ResetUsbDeviceNumbers();
 }

stepmania/src/arch/MemoryCard/MemoryCardDriver.h

@@ -45,7 +45,8 @@ public:
 	virtual bool StorageDevicesChanged() = 0;
 	virtual void GetStorageDevices( vector<UsbStorageDevice>& vStorageDevicesOut ) = 0;
 	virtual bool MountAndTestWrite( UsbStorageDevice* pDevice ) = 0;	// return false if mount or write fails
-	virtual void Flush( UsbStorageDevice* pDevice ) { }
+	virtual void Flush( UsbStorageDevice* pDevice ) {}
+	virtual void ResetUsbStorage() {};
 };
 
 #endif

stepmania/src/arch/MemoryCard/MemoryCardDriver_Linux.cpp

@@ -254,6 +254,13 @@ void MemoryCardDriver_Linux::Flush( UsbStorageDevice* pDevice )
 	system( sCommand );
 }
 
+void MemoryCardDriver_Linux::ResetUsbStorage()
+{
+	system( "rmmod usb-storage" );
+	system( "modprobe usb-storage" );
+}
+
+
 /*
  * Copyright (c) 2003 by the person(s) listed below.  All rights reserved.
  *	Chris Danford