回复: [edk2-devel] [PATCH] MdeModulePkg: Initialize local variable value before they are used

["gaoliming" <gaoliming@byosoft.com.cn>]

Laszlo:
  I agree your comments. I will update the patch to include the comments in code and commit message. 

Thanks
Liming
> -----邮件原件-----
> 发件人: Laszlo Ersek <lersek@redhat.com>
> 发送时间: 2021年3月12日 1:22
> 收件人: devel@edk2.groups.io; gaoliming@byosoft.com.cn
> 抄送: Jian J Wang <jian.j.wang@intel.com>; Hao A Wu
> <hao.a.wu@intel.com>; sergei@posteo.net
> 主题: Re: [edk2-devel] [PATCH] MdeModulePkg: Initialize local variable value
> before they are used
> 
> Hi Liming,
> 
> On 03/09/21 02:24, gaoliming wrote:
> > This change is to fix the compiler error on GCC49 release build.
> >
> > Cc: Jian J Wang <jian.j.wang@intel.com>
> > Cc: Hao A Wu <hao.a.wu@intel.com>
> > Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
> > ---
> >  MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
> | 1 +
> >  .../Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c    | 1 +
> >  2 files changed, 2 insertions(+)
> >
> > diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
> b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
> > index e99a812a44..0779f94f9e 100644
> > --- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
> > +++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
> > @@ -1122,6 +1122,7 @@ AhciDmaTransfer (
> >
> >    Map   = NULL;
> >    PciIo = Instance->PciIo;
> > +  Status = EFI_SUCCESS;
> >
> >    if (PciIo == NULL) {
> >      return EFI_INVALID_PARAMETER;
> > diff --git
> a/MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c
> b/MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c
> > index 0c9299c8b0..7822cbf4bb 100644
> > ---
> a/MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c
> > +++
> b/MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c
> > @@ -117,6 +117,7 @@ CreateBasicVariablePolicy (
> >
> >    // Now we've gotta determine the total size of the buffer required for
> >    // the VariablePolicy structure.
> > +  NameSize  = 0;
> >    TotalSize = sizeof( VARIABLE_POLICY_ENTRY );
> >    if (Name != NULL) {
> >      NameSize = StrnSizeS( Name, MAX_UINT16 );
> >
> 
> (1) we have a bugzilla ticket related to this (or more precisely,
> overlapping AtaAtapiPassThru):
> 
> https://bugzilla.tianocore.org/show_bug.cgi?id=3228
> 
> I think mentioning the BZ in the commit message might make sense.
> 
> (2) Recently we have used a special comment format for such assignments.
> Namely:
> 
>   //
>   // Set Status to suppress incorrect compiler/analyzer warnings
>   //
>   Status = EFI_SUCCESS;
> 
> Hao already requested that we should document that we only suppress
> compiler false positives with these assignments -- they are not needed
> functionally. However, I think saying so in the commit message *only* is
> not sufficient. I think we should stick with the above code-comment
> format (which we've used recently in several places).
> 
> Thanks!
> Laszlo