Apparently TPL_CALLBACK is too low, code runs into an ASSERT
complaining the new TPL is lower than the old TPL.

Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
 OvmfPkg/VirtioSerialDxe/VirtioSerialPort.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/OvmfPkg/VirtioSerialDxe/VirtioSerialPort.c 
b/OvmfPkg/VirtioSerialDxe/VirtioSerialPort.c
index 522b25e9698c..e4a58deff162 100644
--- a/OvmfPkg/VirtioSerialDxe/VirtioSerialPort.c
+++ b/OvmfPkg/VirtioSerialDxe/VirtioSerialPort.c
@@ -158,7 +158,7 @@ VirtioSerialIoWrite (
 
   VirtioSerialRingClearTx (SerialIo->Dev, PortTx (SerialIo->PortId));
 
-  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
+  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
   if (SerialIo->WriteOffset &&
       (SerialIo->WriteOffset + *BufferSize > PORT_TX_BUFSIZE))
   {
@@ -201,7 +201,7 @@ VirtioSerialIoRead (
     goto NoData;
   }
 
-  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
+  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
   if (SerialIo->WriteOffset) {
     DEBUG ((DEBUG_VERBOSE, "%a:%d: WriteFlush %d\n", __func__, __LINE__, 
SerialIo->WriteOffset));
     VirtioSerialRingSendBuffer (
-- 
2.40.1



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