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* [PATCH] MdeModulePkg/BdsDxe: Don't delete "BootNext" until booting it
@ 2017-09-28  5:50 Ruiyu Ni
  2017-09-28  5:59 ` Zeng, Star
  2017-09-28  6:46 ` Wang, Sunny (HPS SW)
  0 siblings, 2 replies; 7+ messages in thread
From: Ruiyu Ni @ 2017-09-28  5:50 UTC (permalink / raw)
  To: edk2-devel; +Cc: Eric Dong, Star Zeng

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.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Star Zeng <star.zeng@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



^ permalink raw reply related	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2017-09-28  6:44 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-09-28  5:50 [PATCH] MdeModulePkg/BdsDxe: Don't delete "BootNext" until booting it Ruiyu Ni
2017-09-28  5:59 ` Zeng, Star
2017-09-28  6:01   ` Ni, Ruiyu
2017-09-28  6:13     ` Zeng, Star
2017-09-28  6:18       ` Ni, Ruiyu
2017-09-28  6:22         ` Zeng, Star
2017-09-28  6:46 ` Wang, Sunny (HPS SW)

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