[PATCH v2 3/3] MdeModulePkg/SerialDxe: Do not fail reset when SetAttributes is not supported

[Julien Grall <julien.grall@linaro.org>]

After commit 91cc526b15 "MdeModulePkg/SerialDxe: Fix not able to change
serial attributes", serial is initialized using the reset method that
will call SetAttributes.

However, SetAttributes may return EFI_INVALID_PARAMETER when a driver
does not support some parameters. This will be propated by the reset
function and lead to UEFI failing to get the console setup.

For instance, this is the case when using the Xen console driver.

Fix it by instropecting the result and return EFI_SUCCESS when the
SetAttributes report an invalid parameter (i.e EFI_INVALID_PARAMETER).

Contributed-under: Tianocore Contribution Agreement 1.1
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
 MdeModulePkg/Universal/SerialDxe/SerialIo.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/MdeModulePkg/Universal/SerialDxe/SerialIo.c b/MdeModulePkg/Universal/SerialDxe/SerialIo.c
index 08b95a4a33..53d2785fed 100644
--- a/MdeModulePkg/Universal/SerialDxe/SerialIo.c
+++ b/MdeModulePkg/Universal/SerialDxe/SerialIo.c
@@ -239,6 +239,15 @@ SerialReset (
                    (EFI_STOP_BITS_TYPE) This->Mode->StopBits
                    );
 
+  //
+  // The serial device may not support some of the attributes. To prevent
+  // later failure, always return EFI_SUCCESS when SetAttributes is returning
+  // EFI_INVALID_PARAMETER.
+  //
+  if (Status == EFI_INVALID_PARAMETER) {
+    return EFI_SUCCESS;
+  }
+
   return Status;
 }
 
-- 
2.11.0