Re: [PATCH V3] MdeModulePkg/DxeCore: Fixed Interface returned by CoreOpenProtocol

["Gao, Liming" <liming.gao@intel.com>]

Reviewed-by: Liming Gao <liming.gao@intel.com>

> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Amit Kumar
> Sent: Monday, June 19, 2017 8:24 PM
> To: edk2-devel@lists.01.org
> Cc: Tian, Feng <feng.tian@intel.com>
> Subject: [edk2] [PATCH V3] MdeModulePkg/DxeCore: Fixed Interface returned by CoreOpenProtocol
> 
> Change Since v2:
> 1) Modified to use EFI_ERROR to get status code
> 
> Change since v1:
> 1) Fixed typo protocal to protocol
> 2) Fixed coding style
> 
> Modified source code to update Interface as per spec.
> 1) In case of Protocol is un-supported, interface should be returned NULL.
> 2) In case of any error, interface should not be modified.
> 3) In case of Test Protocol, interface is optional.
> 
> Contributed-under: TianoCore Contribution Agreement 1.0
> Signed-off-by: Amit Kumar <amit.ak@samsung.com>
> ---
>  MdeModulePkg/Core/Dxe/Hand/Handle.c | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/MdeModulePkg/Core/Dxe/Hand/Handle.c b/MdeModulePkg/Core/Dxe/Hand/Handle.c
> index 1c25521..6de300f 100644
> --- a/MdeModulePkg/Core/Dxe/Hand/Handle.c
> +++ b/MdeModulePkg/Core/Dxe/Hand/Handle.c
> @@ -1004,12 +1004,8 @@ CoreOpenProtocol (
>    //
>    // Check for invalid Interface
>    //
> -  if (Attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL) {
> -    if (Interface == NULL) {
> -      return EFI_INVALID_PARAMETER;
> -    } else {
> -      *Interface = NULL;
> -    }
> +  if ((Attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL) && (Interface == NULL)) {
> +    return EFI_INVALID_PARAMETER;
>    }
> 
>    //
> @@ -1073,15 +1069,11 @@ CoreOpenProtocol (
>    Prot = CoreGetProtocolInterface (UserHandle, Protocol);
>    if (Prot == NULL) {
>      Status = EFI_UNSUPPORTED;
> +    // Return NULL Interface if Unsupported Protocol
> +    *Interface = NULL;
>      goto Done;
>    }
> 
> -  //
> -  // This is the protocol interface entry for this protocol
> -  //
> -  if (Attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL) {
> -    *Interface = Prot->Interface;
> -  }
>    Status = EFI_SUCCESS;
> 
>    ByDriver        = FALSE;
> @@ -1175,6 +1167,14 @@ CoreOpenProtocol (
>    }
> 
>  Done:
> +
> +  //
> +  // This is the protocol interface entry for this protocol.
> +  // In case of any Error, Interface should not be updated as per spec.
> +  //
> +  if (!EFI_ERROR (Status) && Attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL) {
> +    *Interface = Prot->Interface;
> +  }
>    //
>    // Done. Release the database lock are return
>    //
> --
> 1.9.1
> 
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