OvmfPkg/VirtioSerialDxe: factor out VirtioSerialIoWriteFlush

Next patch needs this function.
No functional change.

Signed-off-by: Gerd Hoffmann <[email protected]>

Author: kraxel

OvmfPkg/VirtioSerialDxe/VirtioSerialPort.c

@@ -88,6 +88,31 @@ VirtioSerialIoReset (
   return EFI_SUCCESS;
 }
 
+STATIC
+VOID
+VirtioSerialIoWriteFlush (
+  IN EFI_SERIAL_IO_PROTOCOL  *This
+  )
+{
+  VIRTIO_SERIAL_IO_PROTOCOL  *SerialIo = (VIRTIO_SERIAL_IO_PROTOCOL *)This;
+  EFI_TPL                    OldTpl;
+
+  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
+  if (SerialIo->WriteOffset) {
+    DEBUG ((DEBUG_VERBOSE, "%a:%d: WriteFlush %d\n", __func__, __LINE__, SerialIo->WriteOffset));
+    VirtioSerialRingSendBuffer (
+      SerialIo->Dev,
+      PortTx (SerialIo->PortId),
+      SerialIo->WriteBuffer,
+      SerialIo->WriteOffset,
+      TRUE
+      );
+    SerialIo->WriteOffset = 0;
+  }
+
+  gBS->RestoreTPL (OldTpl);
+}
+
 STATIC
 EFI_STATUS
 EFIAPI
@@ -194,26 +219,12 @@ VirtioSerialIoRead (
   VIRTIO_SERIAL_PORT         *Port     = SerialIo->Dev->Ports + SerialIo->PortId;
   BOOLEAN                    HasData;
   UINT32                     Length;
-  EFI_TPL                    OldTpl;
 
   if (!Port->DeviceOpen) {
     goto NoData;
   }
 
-  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
-  if (SerialIo->WriteOffset) {
-    DEBUG ((DEBUG_VERBOSE, "%a:%d: WriteFlush %d\n", __func__, __LINE__, SerialIo->WriteOffset));
-    VirtioSerialRingSendBuffer (
-      SerialIo->Dev,
-      PortTx (SerialIo->PortId),
-      SerialIo->WriteBuffer,
-      SerialIo->WriteOffset,
-      TRUE
-      );
-    SerialIo->WriteOffset = 0;
-  }
-
-  gBS->RestoreTPL (OldTpl);
+  VirtioSerialIoWriteFlush (This);
 
   if (SerialIo->ReadOffset == SerialIo->ReadSize) {
     HasData = VirtioSerialRingGetBuffer (