remove unnecessary check for NULL pointer.

[mirror_edk2.git] / EdkModulePkg / Bus / Pci / PciBus / Dxe / PciDriverOverride.c

/*++\r
\r
Copyright (c) 2006 - 2007, Intel Corporation\r
All rights reserved. This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
Module Name:\r
\r
  PciDriverOverride.c\r
\r
Abstract:\r
\r
  PCI Bus Driver\r
\r
Revision History\r
\r
--*/\r
\r
#include "pcibus.h"\r
\r
EFI_STATUS\r
InitializePciDriverOverrideInstance (\r
  PCI_IO_DEVICE  *PciIoDevice\r
  )\r
/*++\r
\r
Routine Description:\r
\r
  Initializes a PCI Driver Override Instance\r
\r
Arguments:\r
\r
Returns:\r
\r
  None\r
\r
--*/\r
// TODO:    PciIoDevice - add argument and description to function comment\r
// TODO:    EFI_SUCCESS - add return value to function comment\r
{\r
  PciIoDevice->PciDriverOverride.GetDriver = GetDriver;\r
  return EFI_SUCCESS;\r
}\r
\r
EFI_STATUS\r
EFIAPI\r
GetDriver (\r
  IN EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL              *This,\r
  IN OUT EFI_HANDLE                                         *DriverImageHandle\r
  )\r
/*++\r
\r
Routine Description:\r
\r
  Get a overriding driver image\r
\r
Arguments:\r
\r
Returns:\r
\r
  None\r
\r
--*/\r
// TODO:    This - add argument and description to function comment\r
// TODO:    DriverImageHandle - add argument and description to function comment\r
// TODO:    EFI_SUCCESS - add return value to function comment\r
// TODO:    EFI_NOT_FOUND - add return value to function comment\r
// TODO:    EFI_SUCCESS - add return value to function comment\r
// TODO:    EFI_INVALID_PARAMETER - add return value to function comment\r
{\r
  PCI_IO_DEVICE             *PciIoDevice;\r
  LIST_ENTRY                *CurrentLink;\r
  PCI_DRIVER_OVERRIDE_LIST  *Node;\r
\r
  PciIoDevice = PCI_IO_DEVICE_FROM_PCI_DRIVER_OVERRIDE_THIS (This);\r
\r
  CurrentLink = PciIoDevice->OptionRomDriverList.ForwardLink;\r
\r
  while (CurrentLink && CurrentLink != &PciIoDevice->OptionRomDriverList) {\r
\r
    Node = DRIVER_OVERRIDE_FROM_LINK (CurrentLink);\r
\r
    if (*DriverImageHandle == NULL) {\r
\r
      *DriverImageHandle = Node->DriverImageHandle;\r
      return EFI_SUCCESS;\r
    }\r
\r
    if (*DriverImageHandle == Node->DriverImageHandle) {\r
\r
      if (CurrentLink->ForwardLink == &PciIoDevice->OptionRomDriverList ||\r
          CurrentLink->ForwardLink == NULL) {\r
        return EFI_NOT_FOUND;\r
      }\r
\r
      //\r
      // Get next node\r
      //\r
      Node                = DRIVER_OVERRIDE_FROM_LINK (CurrentLink->ForwardLink);\r
      *DriverImageHandle  = Node->DriverImageHandle;\r
      return EFI_SUCCESS;\r
    }\r
\r
    CurrentLink = CurrentLink->ForwardLink;\r
  }\r
\r
  return EFI_INVALID_PARAMETER;\r
}\r
\r
EFI_STATUS\r
AddDriver (\r
  IN PCI_IO_DEVICE     *PciIoDevice,\r
  IN EFI_HANDLE        DriverImageHandle\r
  )\r
/*++\r
\r
Routine Description:\r
\r
  Add a overriding driver image\r
\r
Arguments:\r
\r
Returns:\r
\r
  None\r
\r
--*/\r
// TODO:    PciIoDevice - add argument and description to function comment\r
// TODO:    DriverImageHandle - add argument and description to function comment\r
// TODO:    EFI_OUT_OF_RESOURCES - add return value to function comment\r
// TODO:    EFI_SUCCESS - add return value to function comment\r
// TODO:    EFI_SUCCESS - add return value to function comment\r
// TODO:    EFI_SUCCESS - add return value to function comment\r
// TODO:    EFI_SUCCESS - add return value to function comment\r
{\r
  EFI_STATUS                    Status;\r
  EFI_IMAGE_DOS_HEADER          *DosHdr;\r
  EFI_IMAGE_NT_HEADERS          *PeHdr;\r
  EFI_LOADED_IMAGE_PROTOCOL     *LoadedImage;\r
  PCI_DRIVER_OVERRIDE_LIST      *Node;\r
\r
  Status = gBS->HandleProtocol (DriverImageHandle, &gEfiLoadedImageProtocolGuid, (VOID **) &LoadedImage);\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  Node = AllocatePool (sizeof (PCI_DRIVER_OVERRIDE_LIST));\r
  if (Node == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  Node->Signature         = DRIVER_OVERRIDE_SIGNATURE;\r
  Node->DriverImageHandle = DriverImageHandle;\r
\r
  InsertTailList (&PciIoDevice->OptionRomDriverList, &(Node->Link));\r
\r
  PciIoDevice->BusOverride  = TRUE;\r
\r
  DosHdr                    = (EFI_IMAGE_DOS_HEADER *) LoadedImage->ImageBase;\r
  if (DosHdr->e_magic != EFI_IMAGE_DOS_SIGNATURE) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  PeHdr = (EFI_IMAGE_NT_HEADERS *) ((UINTN) LoadedImage->ImageBase + DosHdr->e_lfanew);\r
\r
  if (PeHdr->FileHeader.Machine != EFI_IMAGE_MACHINE_EBC) {\r
    return EFI_SUCCESS;\r
  }\r
  return EFI_SUCCESS;\r
}\r