Fix hang when changing UMD with retroachievements enabled

Fixes #17976

Core/HLE/sceUmd.cpp

@@ -487,12 +487,13 @@ static u32 sceUmdGetErrorStat()
 
 void __UmdReplace(const Path &filepath) {
 	std::string error = "";
-	if (!UmdReplace(filepath, error)) {
+	FileLoader *fileLoader;
+	if (!UmdReplace(filepath, &fileLoader, error)) {
 		ERROR_LOG(SCEIO, "UMD Replace failed: %s", error.c_str());
 		return;
 	}
 
-	Achievements::ChangeUMD(filepath);
+	Achievements::ChangeUMD(filepath, fileLoader);
 
 	UMDInserted = false;
 	// Wake any threads waiting for the disc to be removed.

Core/Loaders.cpp

@@ -385,7 +385,7 @@ bool LoadFile(FileLoader **fileLoaderPtr, std::string *error_string) {
 	return false;
 }
 
-bool UmdReplace(const Path &filepath, std::string &error) {
+bool UmdReplace(const Path &filepath, FileLoader **fileLoader, std::string &error) {
 	IFileSystem *currentUMD = pspFileSystem.GetSystem("disc0:");
 
 	if (!currentUMD) {
@@ -404,6 +404,8 @@ bool UmdReplace(const Path &filepath, std::string &error) {
 
 	loadedFile = ResolveFileLoaderTarget(loadedFile);
 
+	*fileLoader = loadedFile;
+
 	std::string errorString;
 	IdentifiedFileType type = Identify_File(loadedFile, &errorString);
 
@@ -415,7 +417,6 @@ bool UmdReplace(const Path &filepath, std::string &error) {
 			error = "reinit memory failed";
 			return false;
 		}
-
 		break;
 	default:
 		error = "Unsupported file type: " + std::to_string((int)type) + " " + errorString;

Core/Loaders.h

@@ -157,4 +157,4 @@ void RegisterFileLoaderFactory(std::string prefix, std::unique_ptr<FileLoaderFac
 // Can modify the string filename, as it calls IdentifyFile above.
 bool LoadFile(FileLoader **fileLoaderPtr, std::string *error_string);
 
-bool UmdReplace(const Path &filepath, std::string &error);
+bool UmdReplace(const Path &filepath, FileLoader **fileLoader, std::string &error);

Core/RetroAchievements.cpp

@@ -844,17 +844,47 @@ void UnloadGame() {
 }
 
 void change_media_callback(int result, const char *error_message, rc_client_t *client, void *userdata) {
+	auto ac = GetI18NCategory(I18NCat::ACHIEVEMENTS);
 	NOTICE_LOG(ACHIEVEMENTS, "Change media callback: %d (%s)", result, error_message);
 	g_isIdentifying = false;
+
+	switch (result) {
+	case RC_OK:
+	{
+		// Successful! Later, show a message that we succeeded.
+		break;
+	}
+	case RC_NO_GAME_LOADED:
+		// The current game does not support achievements.
+		g_OSD.Show(OSDType::MESSAGE_INFO, ac->T("RetroAchievements are not available for this game"), "", g_RAImageID, 3.0f);
+		break;
+	case RC_NO_RESPONSE:
+		// We lost the internet connection at some point and can't report achievements.
+		ShowNotLoggedInMessage();
+		break;
+	default:
+		// Other various errors.
+		ERROR_LOG(ACHIEVEMENTS, "Failed to identify/load game: %d (%s)", result, error_message);
+		g_OSD.Show(OSDType::MESSAGE_ERROR, ac->T("Failed to identify game. Achievements will not unlock."), "", g_RAImageID, 6.0f);
+		break;
+	}
 }
 
-void ChangeUMD(const Path &path) {
+void ChangeUMD(const Path &path, FileLoader *fileLoader) {
 	if (!IsActive()) {
 		// Nothing to do.
 		return;
 	}
 
-	rc_client_begin_change_media(g_rcClient, 
+	g_blockDevice = constructBlockDevice(fileLoader);
+	if (!g_blockDevice) {
+		ERROR_LOG(ACHIEVEMENTS, "Failed to construct block device for '%s' - can't identify", path.c_str());
+		return;
+	}
+
+	g_isIdentifying = true;
+
+	rc_client_begin_change_media(g_rcClient,
 		path.c_str(),
 		nullptr,
 		0,
@@ -862,7 +892,8 @@ void ChangeUMD(const Path &path) {
 		nullptr
 	);
 
-	g_isIdentifying = true;
+	// fclose above will have deleted it.
+	g_blockDevice = nullptr;
 }
 
 std::set<uint32_t> GetActiveChallengeIDs() {

Core/RetroAchievements.h

@@ -108,7 +108,7 @@ void Logout();
 
 bool IsReadyToStart();
 void SetGame(const Path &path, IdentifiedFileType fileType, FileLoader *fileLoader);
-void ChangeUMD(const Path &path);  // for in-game UMD change
+void ChangeUMD(const Path &path, FileLoader *fileLoader);  // for in-game UMD change
 void UnloadGame();  // Call when leaving a game.
 
 Statistics GetStatistics();