serialize all memory card operations since mount operations hang if we're doing lsusb or reading USB mass storage descriptors in another thread

stepmania/src/ProfileManager.cpp

@@ -139,12 +139,9 @@ bool ProfileManager::LoadProfileFromMemoryCard( PlayerNumber pn )
 		sDir += PREFSMAN->m_sMemoryCardProfileSubdir;
 		sDir += '/'; 
 
-		MEMCARDMAN->PauseMountingThread();
 		bool bSuccess;
 		bSuccess = LoadProfile( pn, sDir, true );
 
-		MEMCARDMAN->UnPauseMountingThread();
-
 		return true; // If a card is inserted, we want to use the memory card to save - even if the Profile load failed.
 	}
 
@@ -180,14 +177,8 @@ bool ProfileManager::SaveProfile( PlayerNumber pn ) const
 	if( m_sProfileDir[pn].empty() )
 		return false;
 
-	if( ProfileWasLoadedFromMemoryCard(pn) )
-		MEMCARDMAN->PauseMountingThread();
-
 	bool b = m_Profile[pn].SaveAllToDir( m_sProfileDir[pn], PREFSMAN->m_bSignProfileData );
 
-	if( ProfileWasLoadedFromMemoryCard(pn) )
-		MEMCARDMAN->UnPauseMountingThread();
-	
 	return b;
 }