sceNetAdhoc: Ignore the server's answer to a timed-out game mode join

When entering game mode timed out before the server's group BSSID came
back, the late BSSID was taken for a normal group's, and the state went
to CONNECTED: every later CreateEnterGameMode then got ALREADY_CONNECTED.
At the ad hoc tests' 8x speed the 1 s timeouts in net/adhoc/gamemode are
125 ms of wall time, short enough for that on Windows; at 50x it happens
on macOS too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Core/HLE/proAdhoc.cpp

@@ -86,6 +86,7 @@ SceNetAdhocctlScanInfo * networks     = NULL;
 SceNetAdhocctlScanInfo * newnetworks  = NULL;
 u64 adhocctlStartTime                 = 0;
 u64 gameModeEnterTimeUs = 0;
+bool dropLateGroupReply = false;
 std::atomic<bool> isAdhocctlNeedLogin              = false;
 bool isAdhocctlBusy                   = false;
 int adhocctlState                     = ADHOCCTL_STATE_DISCONNECTED;
@@ -1696,6 +1697,12 @@ void friendFinderPoll() {
 			break;
 		case ADHOCCTL_CLIENT_EVENT_LEADER_MAC:{
 			INFO_LOG(Log::sceNet, "FriendFinder: Incoming OPCODE_CONNECT_BSSID [%s]", mac2str((SceNetEtherAddr *)adhocctl_event.leader_mac.mac).c_str());
+			if (dropLateGroupReply) {
+				// The game mode it was for has timed out (we've already left the group again).
+				dropLateGroupReply = false;
+				INFO_LOG(Log::sceNet, "FriendFinder: Ignoring the group BSSID, game mode timed out before it came");
+				break;
+			}
 			// Update Group BSSID
 			memcpy(parameter.bssid.mac_addr.data, adhocctl_event.leader_mac.mac, 6); // This packet seems to contains Adhoc Group Creator's BSSID (similar to AP's BSSID) so it shouldn't get mixed up with local MAC address. Note: On JPCSP + prx files params.bssid is hardcoded to "Jpcsp\0" and doesn't match to any of player's mac
 

Core/HLE/proAdhoc.h

@@ -820,6 +820,9 @@ extern SceNetAdhocctlScanInfo * networks;
 extern u64 adhocctlStartTime;
 // When CreateEnterGameMode or JoinEnterGameMode was called, in emulated time: its timeout is a PSP-side one.
 extern u64 gameModeEnterTimeUs;
+// Set when entering game mode timed out, until the next group join is sent: the server's answer to the
+// timed-out join may still be on its way, and must not connect us to the group.
+extern bool dropLateGroupReply;
 extern std::atomic<bool> isAdhocctlNeedLogin;
 extern bool isAdhocctlBusy;
 extern int adhocctlState;

Core/HLE/sceNetAdhoc.cpp

@@ -626,6 +626,7 @@ static void __AdhocctlNotify(u64 userdata, int cyclesLate) {
 				call_status = adhocctl_connect(adhocctlHandle, (char *)req.group.data);
 				if (call_status == ADHOCCTL_CALL_SUCCESS) {
 					adhocctlInServerGroup = true;
+					dropLateGroupReply = false;
 				}
 				break;
 			}
@@ -2271,6 +2272,8 @@ void __UpdateAdhocctlHandlers(u32 flag, u32 error) {
 }
 
 void NetAdhocctl_GameModeTimedOut() {
+	// If the server's BSSID came in time, there's nothing to drop, and the next join clears this.
+	dropLateGroupReply = true;
 	if (adhocctlInServerGroup) {
 		const std::lock_guard<std::mutex> adhocctl_guard(adhocctlMutex);
 		if (adhocctlHandle != NULL) {