Current implementation deletes the "BootNext" before calling
any PlatformBootManagerLib APIs, but if system resets in
PlatformBootManagerLib APIs, "BootNext" is not consumed but lost.
The patch defers the deletion of "BootNext" to before booting it.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu...@intel.com>
Cc: Eric Dong <eric.d...@intel.com>
Cc: Star Zeng <star.z...@intel.com>
---
MdeModulePkg/Universal/BdsDxe/BdsEntry.c | 35 ++++++++++++++++++--------------
1 file changed, 20 insertions(+), 15 deletions(-)
diff --git a/MdeModulePkg/Universal/BdsDxe/BdsEntry.c
b/MdeModulePkg/Universal/BdsDxe/BdsEntry.c
index ac5f9088dd..a6fe617b56 100644
--- a/MdeModulePkg/Universal/BdsDxe/BdsEntry.c
+++ b/MdeModulePkg/Universal/BdsDxe/BdsEntry.c
@@ -808,7 +808,8 @@ BdsEntry (
ASSERT_EFI_ERROR (Status);
//
- // Cache and remove the "BootNext" NV variable.
+ // Cache the "BootNext" NV variable before calling any
PlatformBootManagerLib APIs
+ // This could avoid the "BootNext" set by PlatformBootManagerLib be consumed
in this boot.
//
GetEfiGlobalVariable2 (EFI_BOOT_NEXT_VARIABLE_NAME, (VOID **) &BootNext,
&DataSize);
if (DataSize != sizeof (UINT16)) {
@@ -817,17 +818,6 @@ BdsEntry (
}
BootNext = NULL;
}
- Status = gRT->SetVariable (
- EFI_BOOT_NEXT_VARIABLE_NAME,
- &gEfiGlobalVariableGuid,
- 0,
- 0,
- NULL
- );
- //
- // Deleting NV variable shouldn't fail unless it doesn't exist.
- //
- ASSERT (Status == EFI_SUCCESS || Status == EFI_NOT_FOUND);
//
// Initialize the platform language variables
@@ -1052,10 +1042,25 @@ BdsEntry (
EfiBootManagerHotkeyBoot ();
- //
- // Boot to "BootNext"
- //
if (BootNext != NULL) {
+ //
+ // Delete "BootNext" NV variable before transferring control to it to
prevent loops.
+ //
+ Status = gRT->SetVariable (
+ EFI_BOOT_NEXT_VARIABLE_NAME,
+ &gEfiGlobalVariableGuid,
+ 0,
+ 0,
+ NULL
+ );
+ //
+ // Deleting NV variable shouldn't fail unless it doesn't exist.
+ //
+ ASSERT (Status == EFI_SUCCESS || Status == EFI_NOT_FOUND);
+
+ //
+ // Boot to "BootNext"
+ //
UnicodeSPrint (BootNextVariableName, sizeof (BootNextVariableName),
L"Boot%04x", *BootNext);
Status = EfiBootManagerVariableToLoadOption (BootNextVariableName,
&LoadOption);
if (!EFI_ERROR (Status)) {
--
2.12.2.windows.2
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