[Patch] MdeModulePkg/Variable/RuntimeDxe: Fix return status from Reclaim()

["Michael D Kinney" <michael.d.kinney@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2844

Update Reclaim() to return the error status from the reclaim
operation and not the status of SynchronizeRuntimeVariableCache()
that can be EFI_SUCCESS even through the status from reclaim
is an error.  Without this change, the return status from
SetVariable() can be EFI_SUCCESS even though the variable was
not actually set.  This occurs if the variable store is full
and a Reclaim() is invoked to free up space and even after all
possible space is freed, there is still not enough room for
the variable being set.  This condition should return
EFI_OUT_OF_RESOURCES.

Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
---
 .../Universal/Variable/RuntimeDxe/Variable.c  | 30 +++++++++++--------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
index 1e71fc642c..41f8ff4ceb 100644
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
@@ -531,6 +531,7 @@ Reclaim (
   VOID                  *Point1;
   BOOLEAN               FoundAdded;
   EFI_STATUS            Status;
+  EFI_STATUS            DoneStatus;
   UINTN                 CommonVariableTotalSize;
   UINTN                 CommonUserVariableTotalSize;
   UINTN                 HwErrVariableTotalSize;
@@ -774,25 +775,30 @@ Reclaim (
   }
 
 Done:
+  DoneStatus = EFI_SUCCESS;
   if (IsVolatile || mVariableModuleGlobal->VariableGlobal.EmuNvMode) {
-    Status =  SynchronizeRuntimeVariableCache (
-                &mVariableModuleGlobal->VariableGlobal.VariableRuntimeCacheContext.VariableRuntimeVolatileCache,
-                0,
-                VariableStoreHeader->Size
-                );
-    ASSERT_EFI_ERROR (Status);
+    DoneStatus = SynchronizeRuntimeVariableCache (
+                   &mVariableModuleGlobal->VariableGlobal.VariableRuntimeCacheContext.VariableRuntimeVolatileCache,
+                   0,
+                   VariableStoreHeader->Size
+                   );
+    ASSERT_EFI_ERROR (DoneStatus);
     FreePool (ValidBuffer);
   } else {
     //
     // For NV variable reclaim, we use mNvVariableCache as the buffer, so copy the data back.
     //
     CopyMem (mNvVariableCache, (UINT8 *) (UINTN) VariableBase, VariableStoreHeader->Size);
-    Status =  SynchronizeRuntimeVariableCache (
-                &mVariableModuleGlobal->VariableGlobal.VariableRuntimeCacheContext.VariableRuntimeNvCache,
-                0,
-                VariableStoreHeader->Size
-                );
-    ASSERT_EFI_ERROR (Status);
+    DoneStatus = SynchronizeRuntimeVariableCache (
+                   &mVariableModuleGlobal->VariableGlobal.VariableRuntimeCacheContext.VariableRuntimeNvCache,
+                   0,
+                   VariableStoreHeader->Size
+                   );
+    ASSERT_EFI_ERROR (DoneStatus);
+  }
+
+  if (!EFI_ERROR (Status) && EFI_ERROR (DoneStatus)) {
+    Status = DoneStatus;
   }
 
   return Status;
-- 
2.21.0.windows.1