Use GetBufferType0x21 on TransactParcelAuto aswell

Ryujinx.Core/OsHle/Ipc/IpcMessage.cs

@@ -176,12 +176,16 @@ namespace Ryujinx.Core.OsHle.Ipc
 
         public (long Position, long Size) GetBufferType0x21()
         {
-            if (PtrBuff.Count > 0 && PtrBuff[0].Position != 0 && PtrBuff[0].Size != 0)
+            if (PtrBuff.Count       != 0 &&
+                PtrBuff[0].Position != 0 &&
+                PtrBuff[0].Size     != 0)
             {
                 return (PtrBuff[0].Position, PtrBuff[0].Size);
             }
 
-            if (SendBuff.Count > 0 && SendBuff[0].Position != 0 && SendBuff[0].Size != 0)
+            if (SendBuff.Count       != 0 &&
+                SendBuff[0].Position != 0 &&
+                SendBuff[0].Size     != 0)
             {
                 return (SendBuff[0].Position, SendBuff[0].Size);
             }
@@ -191,12 +195,16 @@ namespace Ryujinx.Core.OsHle.Ipc
 
         public (long Position, long Size) GetBufferType0x22()
         {
-            if (RecvListBuff.Count > 0 && RecvListBuff[0].Position != 0 && RecvListBuff[0].Size != 0)
+            if (RecvListBuff.Count       != 0 &&
+                RecvListBuff[0].Position != 0 &&
+                RecvListBuff[0].Size     != 0)
             {
                 return (RecvListBuff[0].Position, RecvListBuff[0].Size);
             }
 
-            if (ReceiveBuff.Count > 0 && ReceiveBuff[0].Position != 0 && ReceiveBuff[0].Size != 0)
+            if (ReceiveBuff.Count       != 0 &&
+                ReceiveBuff[0].Position != 0 &&
+                ReceiveBuff[0].Size     != 0)
             {
                 return (ReceiveBuff[0].Position, ReceiveBuff[0].Size);
             }

Ryujinx.Core/OsHle/Services/Nv/INvDrvServices.cs

@@ -139,7 +139,7 @@ namespace Ryujinx.Core.OsHle.Services.Nv
 
             return 0;
         }
-        
+
         public long FinishInitialize(ServiceCtx Context)
         {
             Context.Ns.Log.PrintStub(LogClass.ServiceNv, "Stubbed.");

Ryujinx.Core/OsHle/Services/Vi/IHOSBinderDriver.cs

@@ -48,16 +48,12 @@ namespace Ryujinx.Core.OsHle.Services.Vi
             return Flinger.ProcessParcelRequest(Context, Data, Code);
         }
 
-        //TransactParcelAuto(i32, u32, u32, buffer<unknown, 0x21, 0>) -> buffer<unknown, 0x22, 0>
-        //Buffer C (PtrBuff) and X (ReceiveListBuff) can be used here...
-        //But they are all null during all my tests.
         public long TransactParcelAuto(ServiceCtx Context)
         {
             int Id   = Context.RequestData.ReadInt32();
             int Code = Context.RequestData.ReadInt32();
 
-            long DataPos  = Context.Request.SendBuff[0].Position;
-            long DataSize = Context.Request.SendBuff[0].Size;
+            (long DataPos, long DataSize) = Context.Request.GetBufferType0x21();
 
             byte[] Data = AMemoryHelper.ReadBytes(Context.Memory, DataPos, DataSize);