MdeModulePkg: Minor update to the Data parameter for PEI GetVariable()

[mirror_edk2.git] / MdeModulePkg / Universal / Variable / Pei / Variable.c

diff --git a/MdeModulePkg/Universal/Variable/Pei/Variable.c b/MdeModulePkg/Universal/Variable/Pei/Variable.c
index a072c31e60e74c89683503e5716cf6dd32f40ea2..4060f4711dd07dd4ea533971ee099895f809b585 100644 (file)
--- a/MdeModulePkg/Universal/Variable/Pei/Variable.c
+++ b/MdeModulePkg/Universal/Variable/Pei/Variable.c
@@ -947,9 +947,10 @@ FindVariable (
   @param  DataSize              On entry, points to the size in bytes of the Data buffer.\r
                                 On return, points to the size of the data returned in Data.\r
   @param  Data                  Points to the buffer which will hold the returned variable value.\r
+                                May be NULL with a zero DataSize in order to determine the size of the buffer needed.\r
 \r
   @retval EFI_SUCCESS           The variable was read successfully.\r
-  @retval EFI_NOT_FOUND         The variable could not be found.\r
+  @retval EFI_NOT_FOUND         The variable was be found.\r
   @retval EFI_BUFFER_TOO_SMALL  The DataSize is too small for the resulting data.\r
                                 DataSize is updated with the size required for\r
                                 the specified variable.\r
@@ -965,7 +966,7 @@ PeiGetVariable (
   IN CONST  EFI_GUID                        *VariableGuid,\r
   OUT       UINT32                          *Attributes,\r
   IN OUT    UINTN                           *DataSize,\r
-  OUT       VOID                            *Data\r
+  OUT       VOID                            *Data OPTIONAL\r
   )\r
 {\r
   VARIABLE_POINTER_TRACK  Variable;\r